Lincoln Corsair: Automatic Transmission External Controls - Automatic Transmission – HF45 / Description and Operation - External Controls - System Operation and Component Description

System Diagram

E350598 *.sttxt { visibility: hidden; } *.stcallout { visibility: visible; } 1 Driver Door Latch 2 Brake On/Off (BOO) Switch 3 BCM 4 PCM 5 IPC 6 RCM 7 GWM 8 GSM

Item	Description
1	Driver Door Latch
2	Brake On/Off (BOO) Switch
3	BCM
4	PCM
5	IPC
6	RCM
7	GWM
8	GSM

Network Message Chart

Broadcast Message	Originating Module	Message Purpose
Brake switch position	BCM	Input from brake switch necessary to change gears.
Gear data	GSM	Message sent to PCM which gear is commanded.
Gear confirmation	PCM	Input to GSM confirming gear selection.
PRND mode	IPC	Used for PRND display.
Gear command	PCM	Input to change gears.
Key in ignition status	BCM	Input used to change gears.
Vehicle lock status	BCM	Input used to move transmission out of P .
Seat belt buckle data	RCM	Input from seat belt buckle to determine driver presence.

System Operation

Component Description

GSM

When the driver needs to change gear position the driver selects P R N or D by pushing a button on the GSM . Each GSM push button has hall effect sensors that are used as inputs when a push button has been pressed. When park is selected above 3 mph, Neutral is provided along with the message "Gear will Engage at Low Speed" in the IPC until the vehicle speed drops below 3 mph. Park is engaged when the vehicle speed drops below 3 mph.

IPC

The IPC receives signals from the PCM and displays the current range of the transmission on the PRND. Under some circumstances messages from the shift by wire system are also displayed for the customer on the multifunction display. For example, "Press Brake to shift from Park" is displayed when an attempt to shift to a non-park rotary dial position while the vehicle is in P and the brake is not pressed.

Push Button Shift Modes

Automatic Return to Park

NOTE: This feature does not operate when your vehicle is in Stay In Neutral Mode or Neutral Tow.

The vehicle has a safety feature that will automatically shift the transmission into P when one of the following conditions are met at low speed:

• The ignition is turned off and vehicle falls below low speed threshold
• The driver door is opened with the seat belt unlatched
• Unlatching the seatbelt while the driver door is open

Stay in Neutral Mode

If necessary for the vehicle to stay in N without the driver present, such as being pulled through a car wash, this mode disables Return to Park. In Stay in Neutral the system will remain awake draining the battery if the engine is off. To enter Stay in Neutral mode: Turn the ignition on by pressing the start button, apply the brakes, press the N button on the GSM . Press the N button again within 3 seconds to enter Stay in Neutral mode. A message appears in your information display screen when your vehicle has entered Stay in Neutral mode. To exit Stay in Neutral mode, apply the brake and select a different gear. Extended usage of Stay in Neutral mode may result in a battery voltage reduction to a level where the vehicle may no longer start. Do not tow your vehicle in this mode.

Neutral Tow Mode

This mode is similar to the Stay in Neutral Mode, however it allows the vehicle to power down in N . See owner's manual for instructions on how to enter or exit the Neutral Tow Mode.