Front Control Module: Operation
WARNING: This page is about a different car, the 2004 Dodge Grand Caravan, 2004 Dodge Caravan, and 2004 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.
As messages are sent over the Programmable Communications Interface (PCI) data bus, the Front Control Module (FCM) reads these messages and controls power to some of the vehicles electrical systems by completing the circuit to ground (low side driver) or completing the circuit to 12 volt power (high side driver).
The following functions are controlled by the Front Control Module:
- Accessory Relay Actuation
- Brake Transmission Shift Interlock Functions (BTSI)
- Diesel Cabin Heater (Diesel Engine Vehicles)
- Electronic Back Light (EBL) Rear Defogger
- Electronic Transaxle (Gasoline engine Vehicles)
- Front and Rear Blower Motor Relay Actuation
- Front Fog Lamp Relay Actuation
- Front Washer Motor
- Front Windshield Wiper "HI" & "LO" Relay Actuation
- Front Windshield Wiper "ON" Relay Actuation
- Headlamp Power with Voltage Regulation
- Horn Relay Actuation
- Headlamp Washer Relay Actuation
- Name Brand Speaker (NBS) Relay Actuation
- Occupant Restraint Controller Voltage
- Park Lamp Relay Actuation
- Rear Washer Motor
- Side Airbag Voltage
The following inputs are Received/Monitored by the Front Control Module:
- Ambient Temperature Sensing
- Back-Up switch
- Brake Fluid Level
- B+ Connection Detection
- Engine Crank Signal (Diesel Engine Vehicles)
- Horn Input
- Ignition Switch Start Only
- Ignition Switch Run and Start Only
- Stop Lamp Sense
- Washer Fluid Level
- Windshield Wiper Park