Lincoln Corsair Manuals

Lincoln Corsair: Rear Seats / Diagnosis and Testing - Rear Seats

Lincoln Corsair 2020-2024 Service Manual / Body and Paint / Body and Paint / Rear Seats / Diagnosis and Testing - Rear Seats

Diagnostic Trouble Code (DTC) Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).


  Diagnostic Trouble Code Chart


Module   DTC Description Action
  BCM B1317:11 Third Row Power Fold Seat Output: Circuit Short To Ground   GO to Pinpoint Test H

Global Customer Symptom Code (GCSC) Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).


Symptom Action
Comfort & Entertainment > Seats > 2nd Row/Rear > Heating GO to Pinpoint Test A
Comfort & Entertainment > Seats > 2nd Row/Rear > Heating GO to Pinpoint Test B
Comfort & Entertainment > Seats > 2nd Row/Rear > Heating GO to Pinpoint Test C
Comfort & Entertainment > Seats > 2nd Row/Rear > Heating GO to Pinpoint Test D
Comfort & Entertainment > Seats > 2nd Row/Rear > Heating GO to Pinpoint Test E
Comfort & Entertainment > Seats > 2nd Row/Rear > Heating GO to Pinpoint Test F
Comfort & Entertainment > Seats > 2nd Row/Rear > Heating GO to Pinpoint Test G
Comfort & Entertainment > Seats > 3rd/4th/5th Row > Power Function GO to Pinpoint Test H
Comfort & Entertainment > Seats > 3rd/4th/5th Row > Power Function GO to Pinpoint Test I
Comfort & Entertainment > Seats > 3rd/4th/5th Row > Power Function GO to Pinpoint Test J

Symptom Chart(s)

Symptom Chart: Rear Seats

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).


  Symptom Chart


Condition Actions
Both heated rear seats are inoperative
  • GO to Pinpoint Test A
The LH heated rear seat is inoperative
  • GO to Pinpoint Test B
The RH heated rear seat is inoperative
  • GO to Pinpoint Test C
The LH heated rear seat heats correctly but the indicator does not illuminate when activated
  • GO to Pinpoint Test D
The RH heated rear seat heats correctly but the indicator does not illuminate when activated
  • GO to Pinpoint Test E
The LH heated rear seat indicator is always on
  • GO to Pinpoint Test F
The RH heated rear seat indicator is always on
  • GO to Pinpoint Test G
Both power fold seats are inoperative
  • GO to Pinpoint Test H
The LH power fold seat is inoperative
  • GO to Pinpoint Test I
The RH power fold seat is inoperative
  • GO to Pinpoint Test J

Pinpoint Tests


PINPOINT TEST A: BOTH HEATED REAR SEATS ARE INOPERATIVE

Refer to Wiring Diagrams Cell 119 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Rear Seats - System Operation and Component Description (501-10B Rear Seats, Description and Operation).

Possible Sources

  • Fuse
  • Wiring, terminals or connectors
  • Heated rear seat switch
  • Heated rear seat module

Visual Inspection and Pre-checks

  • Verify BCM fuse 2 (5A) is OK.
  • Verify BJB fuse 48 (20A) is OK.
A1 CHECK FOR VOLTAGE TO THE HEATED REAR SEAT MODULE
  • Ignition OFF.
  • Disconnect Heated Rear Seat Module C3304B .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304B-1   Ground
      C3304B-2   Ground

Are the voltages greater than 11 volts?
Yes GO to A2
No VERIFY BCM fuse 2 (5A) and BJB fuse 48 (20A) are OK. If OK, REPAIR the circuit in question. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

A2 CHECK THE HEATED REAR SEAT MODULE GROUND CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304B-5   Ground

Is the resistance less than 3 ohms?
Yes GO to A3
No REPAIR the circuit.

A3 VERIFY THE HEATED REAR SEAT SWITCH IS PROVIDING A GROUND INPUT SIGNAL TO THE HEATED REAR SEAT MODULE
  • Disconnect Heated Rear Seat Module C3304A .
  • While pressing and releasing the LH heated rear seat switch, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-2   Ground

Is the resistance less than 3 ohms when the switch is pressed and greater than 10,000 ohms when released?
Yes GO to A5
No GO to A4

A4 CHECK THE HEATED REAR SEAT SWITCH GROUND CIRCUIT FOR AN OPEN
  • Disconnect Heated Rear Seat Switch C3182 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3182-8   Ground

Is the resistance less than 3 ohms?
Yes INSTALL a new heated rear seat switch.
No REPAIR the circuit.

A5 CHECK THE TEMPERATURE SENSOR CIRCUIT FOR SHORT TO VOLTAGE
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-3   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to A6

A6 CHECK THE TEMPERATURE SENSOR CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-3   C3304A-12

Is the resistance between 300 and 300K ohms?
Yes INSTALL a new heated rear seat module.
REFER to: Heated Rear Seat Module (501-10B Rear Seats, Removal and Installation).
No REPAIR the circuit.

PINPOINT TEST B: THE LH (LEFT-HAND) HEATED REAR SEAT IS INOPERATIVE

Refer to Wiring Diagrams Cell 119 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Rear Seats - System Operation and Component Description (501-10B Rear Seats, Description and Operation).

Possible Sources

  • Wiring, terminals or connectors
  • Heated rear seat switch
  • Heater mat
  • Heated rear seat module
B1 CHECK THE HEATED REAR SEAT SWITCH INPUT
  • Ignition OFF.
  • Disconnect Heated Rear Seat Module C3304A .
  • While pressing and releasing the LH heated rear seat switch, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-2   Ground

Is the resistance less than 3 ohms when the switch is pressed and greater than 10,000 ohms when released?
Yes GO to B3
No GO to B2

B2 CHECK THE HEATED REAR SEAT SWITCH CIRCUIT FOR AN OPEN OR SHORT TO GROUND
  • Disconnect Heated Rear Seat Switch C3182 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3182-2   C3304A-2

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3182-2   Ground

Are the resistances less than 3 ohms between the heated rear seat switch and heated rear seat module, and greater than 10,000 ohms between the heated rear seat switch and ground?
Yes INSTALL a new heated rear seat switch.
No REPAIR the circuit.

B3 CHECK FOR VOLTAGE TO THE HEATED REAR SEAT MODULE
  • Disconnect Heated Rear Seat Module C3304B .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304B-1   Ground

Is the voltage greater than 11 volts?
Yes GO to B4
No REPAIR the circuit.

B4 CHECK THE HEATER CIRCUITS AND HEATER MATS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304B-4   Ground

Is the resistance between 3 and 5 ohms?
Yes GO to B9
No GO to B5

B5 CHECK THE HEATER MAT GROUND CIRCUIT FOR AN OPEN
  • Disconnect LH Rear Backrest Heater Mat C3360 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3360-2   Ground

Is the resistance less than 3 ohms?
Yes GO to B6
No REPAIR the circuit.

B6 CHECK THE HEATER CIRCUIT FOR AN OPEN OR SHORT TO GROUND
  • Disconnect LH Rear Cushion Heater Mat C3361 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304B-4   C3361-1
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304B-4 Ground

Are the resistances less than 3 ohms between the heated seat module and the LH rear cushion heater mat, and greater than 10,000 ohms between the heated seat module and ground?
Yes GO to B7
No REPAIR the circuit.

B7 CHECK THE CUSHION HEATER MAT FOR AN OPEN
  • Measure the component side resistance between:
    Positive Lead Measurement / Action Negative Lead
    C3361-1, Component Side C3361-4, Component Side

Is the resistance between 0.7 and 1.5 ohms?
Yes GO to B8
No INSTALL a new cushion heater mat.
REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).

B8 CHECK FOR AN OPEN OR A SHORT TO GROUND BETWEEN THE HEATER MATS
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3361-4   C3360-1
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3361-4 Ground

Are the resistances less than 3 ohms between the cushion heater mat and backrest heater mat, and greater than 10,000 ohms between cushion heater mat and ground?
Yes INSTALL a new backrest heater mat.
REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
No REPAIR the circuit.

B9 CHECK THE TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-3 Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to B10

B10 CHECK THE TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-3 Ground

Is the resistance greater than 10,000 ohms?
Yes GO to B11
No REPAIR the circuit.

B11 CHECK THE TEMPERATURE SENSOR AND CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-3   C3304A-12

Is the resistance between 300 and 300K ohms?
Yes INSTALL a new heated rear seat module.
REFER to: Heated Rear Seat Module (501-10B Rear Seats, Removal and Installation).
No GO to B12

B12 CHECK THE TEMPERATURE SENSOR FOR AN OPEN WITH THE HEATER MAT DISCONNECTED
  • Disconnect LH Rear Cushion Heater Mat C3361 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-3   C3361-2
      C3304A-12   C3361-3

Are the resistances less than 3 ohms?
Yes INSTALL a new cushion heater mat.
REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
No REPAIR the circuit in question.

PINPOINT TEST C: THE RH (RIGHT-HAND) HEATED REAR SEAT IS INOPERATIVE

Refer to Wiring Diagrams Cell 119 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Rear Seats - System Operation and Component Description (501-10B Rear Seats, Description and Operation).

Possible Sources

  • Wiring, terminals or connectors
  • Heated rear seat switch
  • Heated rear seat module
C1 CHECK THE HEATED REAR SEAT SWITCH INPUT
  • Ignition OFF.
  • Disconnect Heated Rear Seat Module C3304A .
  • While pressing and releasing the RH heated rear seat switch, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-8   Ground

Is the resistance less than 3 ohms when the switch is pressed and greater than 10,000 ohms when released?
Yes GO to C3
No GO to C2

C2 CHECK THE HEATED REAR SEAT SWITCH CIRCUIT FOR AN OPEN OR SHORT TO GROUND
  • Disconnect Heated Rear Seat Switch C3182 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3182-3   C3304A-8

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3182-3   Ground

Are the resistances less than 3 ohms between the heated rear seat switch and heated rear seat module, and greater than 10,000 ohms between the heated rear seat switch and ground?
Yes INSTALL a new heated rear seat switch.
No REPAIR the circuit.

C3 CHECK FOR VOLTAGE TO THE HEATED REAR SEAT MODULE
  • Disconnect Heated Rear Seat Module C3304B .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304B-3   Ground

Is the voltage greater than 11 volts?
Yes GO to C4
No REPAIR the circuit.

C4 CHECK THE HEATER CIRCUITS AND HEATER MATS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304B-6   Ground

Is the resistance between 3 and 5 ohms?
Yes GO to C9
No GO to C5

C5 CHECK THE HEATER MAT GROUND CIRCUIT FOR AN OPEN
  • Disconnect RH Rear Backrest Heater Mat C3362 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3362-2   Ground

Is the resistance less than 3 ohms?
Yes GO to C6
No REPAIR the circuit.

C6 CHECK THE HEATER CIRCUIT FOR AN OPEN OR SHORT TO GROUND
  • Disconnect RH Rear Cushion Heater Mat C3363 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304B-6   C3363-1
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304B-6 Ground

Are the resistances less than 3 ohms between the heated rear seat module and rear seat cushion heater mat, and greater than 10,000 ohms between the heated rear seat module and ground?
Yes GO to C7
No REPAIR the circuit.

C7 CHECK THE CUSHION HEATER MAT FOR AN OPEN
  • Measure the component side resistance between:
    Positive Lead Measurement / Action Negative Lead
    C3363-1, Component Side C3363-4, Component Side

Is the resistance between 0.7 and 1.5 ohms?
Yes GO to C8
No INSTALL a new cushion heater mat.
REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).

C8 CHECK FOR AN OPEN OR A SHORT TO GROUND BETWEEN THE HEATER MATS
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3363-4   C3362-1
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3363-4 Ground

Are the resistances less than 3 ohms between the cushion heater mat and backrest heater mat, and greater than 10,000 ohms between the cushion heater mat and ground?
Yes INSTALL a new backrest heater mat.
REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
No REPAIR the circuit.

C9 CHECK THE TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-9 Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to C10

C10 CHECK THE TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-9 Ground

Is the resistance greater than 10,000 ohms?
Yes GO to C11
No REPAIR the circuit.

C11 CHECK THE TEMPERATURE SENSOR AND CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-9   C3304A-12

Is the resistance between 300 and 300K ohms?
Yes INSTALL a new heated rear seat module.
REFER to: Heated Rear Seat Module (501-10B Rear Seats, Removal and Installation).
No GO to C12

C12 CHECK THE TEMPERATURE SENSOR FOR AN OPEN WITH THE HEATER MAT DISCONNECTED
  • Disconnect RH Rear Cushion Heater Mat C3363 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-9   C3363-2
      C3304A-12   C3363-3

Are the resistances less than 3 ohms?
Yes INSTALL a new cushion heater mat.
REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
No REPAIR the circuit in question.

PINPOINT TEST D: THE LH (LEFT-HAND) HEATED REAR SEAT HEATS CORRECTLY BUT THE INDICATOR DOES NOT ILLUMINATE WHEN ACTIVATED

Refer to Wiring Diagrams Cell 119 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Rear Seats - System Operation and Component Description (501-10B Rear Seats, Description and Operation).

Possible Sources

  • Wiring, terminals or connectors
  • Heated rear seat switch
  • Heated rear seat module

Visual Inspection and Pre-checks

  • Inspect for a damaged heated rear seat switch.
D1 CHECK THE HEATED SEAT INDICATOR CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Disconnect Heated Rear Seat Module C3304A .
  • Disconnect Heated Rear Seat Switch C3182 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-4 Ground
      C3304A-5 Ground

Are the resistances greater than 10,000 ohms?
Yes GO to D2
No REPAIR the circuit in question.

D2 CHECK THE HEATED SEAT INDICATOR CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-4   C3182-6
      C3304A-5   C3182-7

Are the resistances less than 3 ohms?
Yes GO to D3
No REPAIR the circuit in question.

D3 CHECK THE HIGH HEAT INDICATOR
  • Disconnect Heated Rear Seat Module C3304B .
  • Connect Heated Rear Seat Switch C3182 .
  • Connect:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-5   C3304B-1

Does the high heat indicator illuminate?
Yes REMOVE the fused jumper wire. GO to D4
No REMOVE the fused jumper wire. INSTALL a new heated rear seat switch.

D4 CHECK THE LOW HEAT INDICATOR
  • Connect:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-4   C3304B-1

Does the low heat indicator illuminate?
Yes REMOVE the fused jumper wire. INSTALL a new heated rear seat module.
REFER to: Heated Rear Seat Module (501-10B Rear Seats, Removal and Installation).
No REMOVE the fused jumper wire. INSTALL a new heated rear seat switch.

PINPOINT TEST E: THE RH (RIGHT-HAND) HEATED REAR SEAT HEATS CORRECTLY BUT THE INDICATOR DOES NOT ILLUMINATE WHEN ACTIVATED

Refer to Wiring Diagrams Cell 119 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Rear Seats - System Operation and Component Description (501-10B Rear Seats, Description and Operation).

Possible Sources

  • Wiring, terminals or connectors
  • Heated rear seat switch
  • Heated rear seat module

Visual Inspection and Pre-checks

  • Inspect for a damaged heated rear seat switch.
E1 CHECK THE HEATED SEAT INDICATOR CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Disconnect Heated Rear Seat Module C3304A .
  • Disconnect Heated Rear Seat Switch C3182 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-10 Ground
      C3304A-11 Ground

Are the resistances greater than 10,000 ohms?
Yes GO to E2
No REPAIR the circuit in question.

E2 CHECK THE HEATED SEAT INDICATOR CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-10   C3182-4
      C3304A-11   C3182-5

Are the resistances less than 3 ohms?
Yes GO to E3
No REPAIR the circuit in question.

E3 CHECK THE HIGH HEAT INDICATOR
  • Disconnect Heated Rear Seat Module C3304B .
  • Connect Heated Rear Seat Switch C3182 .
  • Connect:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-11   C3304B-3

Does the high heat indicator illuminate?
Yes REMOVE the fused jumper wire. GO to E4
No REMOVE the fused jumper wire. INSTALL a new heated rear seat switch.

E4 CHECK THE LOW HEAT INDICATOR
  • Connect:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3304A-10   C3304B-3

Does the low heat indicator illuminate?
Yes REMOVE the fused jumper wire. INSTALL a new heated rear seat module.
REFER to: Heated Rear Seat Module (501-10B Rear Seats, Removal and Installation).
No REMOVE the fused jumper wire. INSTALL a new heated rear seat switch.

PINPOINT TEST F: THE LH (LEFT-HAND) HEATED REAR SEAT INDICATOR IS ALWAYS ON

Refer to Wiring Diagrams Cell 119 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Rear Seats - System Operation and Component Description (501-10B Rear Seats, Description and Operation).

Possible Sources

  • Wiring, terminals or connectors
  • Heated rear seat module
F1 CHECK FOR A SHORT TO VOLTAGE IN THE LH (LEFT-HAND) HEATED REAR SEAT SWITCH INDICATOR CIRCUIT
  • Ignition OFF.
  • Disconnect: Heated Rear Seat Module C3304A.
  • Ignition ON.

Is the LH heated rear seat indicator still on?
Yes REPAIR the circuit.
No INSTALL a new heated rear seat module.
REFER to: Heated Rear Seat Module (501-10B Rear Seats, Removal and Installation).

PINPOINT TEST G: THE RH (RIGHT-HAND) HEATED REAR SEAT INDICATOR IS ALWAYS ON

Refer to Wiring Diagrams Cell 119 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Rear Seats - System Operation and Component Description (501-10B Rear Seats, Description and Operation).

Possible Sources

  • Wiring, terminals or connectors
  • Heated rear seat module
G1 CHECK FOR A SHORT TO VOLTAGE IN THE RH (RIGHT-HAND) HEATED REAR SEAT SWITCH INDICATOR CIRCUIT
  • Ignition OFF.
  • Disconnect: Heated Rear Seat Module C3304A.
  • Ignition ON.

Is the RH heated rear seat indicator still on?
Yes REPAIR the circuit.
No INSTALL a new heated rear seat module.
REFER to: Heated Rear Seat Module (501-10B Rear Seats, Removal and Installation).

PINPOINT TEST H: BOTH POWER FOLD SEATS ARE INOPERATIVE

Refer to Wiring Diagrams Cell 120 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Rear Seats - System Operation and Component Description (501-10B Rear Seats, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BCM B1317:11 Third Row Power Fold Seat Output: Circuit Short To Ground This DTC sets when the power fold seat enable circuit is shorted to ground.

Possible Sources

  • Interior lighting system concern
  • Wiring, terminals or connectors
  • Power fold seat control switch
  • BJB
  • BCM
H1 CHECK FOR BCM (BODY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, perform self-test on the BCM .

Is DTC B1317:11 present?
Yes GO to H6
No GO to H2

H2 CHECK THE DOOR AJAR SWITCH OPERATION
  • Open and close the liftgate. Verify the interior lights turn on when the liftgate is open, and off when the door is closed.

Did the interior lights operate normally?
Yes GO to H3
No DIAGNOSE the interior lighting system.
REFER to: Interior Lighting (417-02 Interior Lighting, Diagnosis and Testing).

H3 CHECK THE POWER FOLD SEAT CONTROL SWITCH GROUND CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect: Power Fold Seat Control Switch C4179.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4179-3   Ground

Is the resistance less than 3 ohms?
Yes GO to H4
No REPAIR the circuit.

H4 CHECK THE LH (LEFT-HAND) POWER FOLD SEAT OPERATION WITH A FUSED JUMPER WIRE INSTALLED
  • Ignition OFF.
  • Momentarily connect a fused jumper wire:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4179-3   C4179-4

Did the LH power fold seat operate correctly with the jumper wire connected?
Yes INSTALL a new power fold seat control switch.
REFER to: Power Fold Seat Control Switch (501-10B Rear Seats, Removal and Installation).
No GO to H5

H5 CHECK THE POWER FOLD SEAT ENABLE CIRCUIT FOR VOLTAGE
  • Ignition OFF.
  • Disconnect: BJB C1035B.
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1035B-44   Ground

Is the voltage greater than 11 volts?
Yes GO to H7
No GO to H6

H6 CHECK THE POWER FOLD SEAT ENABLE CIRCUIT FOR AN OPEN OR SHORT TO GROUND
  • Ignition OFF.
  • Disconnect: BCM C2280F.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1035B-44   Ground
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1035B-44   C2280F-18

Is the resistance greater than 10,000 between the BJB and ground, and less than 3 ohms between the BJB and BCM ?
Yes GO to H8
No REPAIR the circuit.

H7 CHECK THE BJB (BATTERY JUNCTION BOX) OPERATION
  • Ignition OFF.
  • Disconnect and inspect the BJB connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins as necessary
    • pushed-out pins - install new pins as necessary
  • Reconnect the BJB connector. Make sure it seats and latches correctly.
  • Reconnect all previously disconnected connectors.
  • Ignition ON.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BJB .
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

H8 CHECK THE BCM (BODY CONTROL MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect the BCM connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins as necessary
    • pushed-out pins - install new pins as necessary
  • Reconnect the BCM connector. Make sure it seats and latches correctly.
  • Reconnect all previously disconnected connectors.
  • Ignition ON.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCM .
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST I: THE LH (LEFT-HAND) POWER FOLD SEAT IS INOPERATIVE

Refer to Wiring Diagrams Cell 120 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Rear Seats - System Operation and Component Description (501-10B Rear Seats, Description and Operation).

Possible Sources

  • Wiring, terminals or connectors
  • Cables/mechanical binding or damage
  • Power fold seat control switch
  • Power fold seat motor
  • Seat frame assembly
  • BJB
I1 CHECK THE POWER FOLD SEAT CONTROL SWITCH CIRCUIT FOR VOLTAGE
  • Ignition OFF.
  • Disconnect: Power Fold Seat Control Switch C4179.
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4179-4   Ground

Is the voltage greater than 11 volts?
Yes GO to I3
No GO to I2

I2 CHECK THE POWER FOLD SEAT CONTROL SWITCH CIRCUIT FOR AN OPEN OR SHORT TO GROUND
  • Ignition OFF.
  • Disconnect: BJB C1035B.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4179-4   Ground
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4179-4   C1035B-46

Is the resistance greater than 10,000 between the power fold seat control switch and ground, and less than 3 ohms between the power fold seat control switch and the BJB ?
Yes GO to I7
No REPAIR the circuit.

I3 CHECK THE LH (LEFT-HAND) POWER FOLD SEAT OPERATION WITH A FUSED JUMPER WIRE INSTALLED
  • Ignition ON.
  • Momentarily connect a fused jumper wire:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4179-3   C4179-4

Did the LH power fold seat operate correctly with the jumper wire connected?
Yes INSTALL a new power fold seat control switch.
REFER to: Power Fold Seat Control Switch (501-10B Rear Seats, Removal and Installation).
No GO to I4

I4 CHECK THE POWER FOLD MOTOR GROUND CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect: LH Power Fold Motor C3345.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3345-1   Ground

Is the resistance less than 3 ohms?
Yes GO to I5
No REPAIR the circuit.

I5 CHECK FOR VOLTAGE TO THE POWER FOLD MOTOR

NOTICE: The following step uses a test lamp to simulate normal circuit loads. Use only a Rotunda Test Lamp (SGT27000) or 250- 300mA incandescent bulb test lamp. To avoid connector terminal damage, use the Rotunda Flex Probe kit for the test lamp probe connection to the vehicle. Do not use the test lamp probe directly on any connector.

  • Connect: Power Fold Seat Control Switch C4179.
  • Ignition ON.
  • Connect a 12-volt incandescent test light between:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3345-2   C3345-1
  • NOTE: The motor output may only activate the seat motor output for approximately 500 ms then turn off. Activate the seat control switch while observing the test light.

Does the test light momentarily illuminate when the seat control switch is activated?
Yes CHECK the cables and/or latch release mechanism for binding or damage. REPAIR or INSTALL a new seat frame assembly as needed. If no concerns are found, INSTALL a new power fold motor.
REFER to: Power Fold Seat Motor (501-10B Rear Seats, Removal and Installation).
No GO to I6

I6 CHECK THE POWER FOLD MOTOR CIRCUIT FOR AN OPEN OR SHORT TO GROUND
  • Ignition OFF.
  • Disconnect: BJB C1035A.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3345-2   Ground
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3345-2   C1035A-48

Is the resistance greater than 10,000 between the power fold motor and ground, and less than 3 ohms between the power fold motor and the BJB ?
Yes GO to I7
No REPAIR the circuit.

I7 CHECK THE BJB (BATTERY JUNCTION BOX) OPERATION
  • Ignition OFF.
  • Disconnect and inspect the BJB connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins as necessary
    • pushed-out pins - install new pins as necessary
  • Reconnect the BJB connector. Make sure it seats and latches correctly.
  • Reconnect all previously disconnected connectors.
  • Ignition ON.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BJB .
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST J: THE RH (RIGHT-HAND) POWER FOLD SEAT IS INOPERATIVE

Refer to Wiring Diagrams Cell 120 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Rear Seats - System Operation and Component Description (501-10B Rear Seats, Description and Operation).

Possible Sources

  • Wiring, terminals or connectors
  • Cables/mechanical binding or damage
  • Power fold seat control switch
  • Power fold seat motor
  • Seat frame assembly
  • BJB
J1 CHECK THE POWER FOLD SEAT CONTROL SWITCH CIRCUIT FOR VOLTAGE
  • Ignition OFF.
  • Disconnect: Power Fold Seat Control Switch C4179.
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4179-2   Ground

Is the voltage greater than 11 volts?
Yes GO to J3
No GO to J2

J2 CHECK THE POWER FOLD SEAT CONTROL SWITCH CIRCUIT FOR AN OPEN OR SHORT TO GROUND
  • Ignition OFF.
  • Disconnect: BJB C1035A.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4179-2   Ground
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4179-2   C1035A-40

Is the resistance greater than 10,000 between the power fold seat control switch and ground, and less than 3 ohms between the power fold seat control switch and the BJB ?
Yes GO to J7
No REPAIR the circuit.

J3 CHECK THE RH (RIGHT-HAND) POWER FOLD SEAT OPERATION WITH A FUSED JUMPER WIRE INSTALLED
  • Ignition ON.
  • Momentarily connect a fused jumper wire:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4179-3   C4179-2

Did the RH power fold seat operate correctly with the jumper wire connected?
Yes INSTALL a new power fold seat control switch.
REFER to: Power Fold Seat Control Switch (501-10B Rear Seats, Removal and Installation).
No GO to J4

J4 CHECK THE POWER FOLD MOTOR GROUND CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect: RH Power Fold Motor C3346.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3346-1   Ground

Is the resistance less than 3 ohms?
Yes GO to J5
No REPAIR the circuit.

J5 CHECK FOR VOLTAGE TO THE POWER FOLD MOTOR

NOTICE: The following step uses a test lamp to simulate normal circuit loads. Use only a Rotunda Test Lamp (SGT27000) or 250- 300mA incandescent bulb test lamp. To avoid connector terminal damage, use the Rotunda Flex Probe kit for the test lamp probe connection to the vehicle. Do not use the test lamp probe directly on any connector.

  • Connect: Power Fold Seat Control Switch C4179.
  • Ignition ON.
  • Connect a 12-volt incandescent test light between:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3346-2   C3346-1
  • NOTE: The motor output may only activate the seat motor output for approximately 500 ms then turn off. Activate the seat control switch while observing the test light.

Does the test light momentarily illuminate when the seat control switch is activated?
Yes CHECK the cables and/or latch release mechanism for binding or damage. REPAIR or INSTALL a new seat frame assembly as needed. If no concerns are found, INSTALL a new power fold motor.
REFER to: Power Fold Seat Motor (501-10B Rear Seats, Removal and Installation).
No GO to J6

J6 CHECK THE POWER FOLD MOTOR CIRCUIT FOR AN OPEN OR SHORT TO GROUND
  • Ignition OFF.
  • Disconnect: BJB C1035A.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3346-2   Ground
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3346-2   C1035A-50

Is the resistance greater than 10,000 between the power fold motor and ground, and less than 3 ohms between the power fold motor and the BJB ?
Yes GO to J7
No REPAIR the circuit.

J7 CHECK THE BJB (BATTERY JUNCTION BOX) OPERATION
  • Ignition OFF.
  • Disconnect and inspect the BJB connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins as necessary
    • pushed-out pins - install new pins as necessary
  • Reconnect the BJB connector. Make sure it seats and latches correctly.
  • Reconnect all previously disconnected connectors.
  • Ignition ON.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BJB .
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.


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