Body Control Module (BCM)
The Body Control Module (BCM) is located behind the driver side cowl panel and controls the following
- Interior lighting
- Exterior lighting
- Dimmable backlighting
- Battery saver function
- Delayed accessory relay function
- Horn
- Brake shift interlock
- Power door locks (vehicles without Intelligent Access (IA))
- Remote Keyless Entry (RKE) system
- Perimeter alarm
- Passive Anti-Theft System (PATS) (vehicles without IA)
- Remote engine start
- Tire Pressure Monitoring System (TPMS)
Refer to the appropriate service information in this article for system specific information and diagnostics.
Battery Saver
Note. Time-out is 1 minute if the vehicle has less than 80 km (50 miles).
To save battery voltage, the BCM provides automatic shut-off of some system controlled components after a time-out period. REFER to EXTERIOR LIGHTING (Exterior Lighting) or INTERIOR LIGHTING (Interior Lighting) for system specific information.
Post Crash Alert Feature
The post crash alert is a function controlled by the BCM. If the Restraints Control Module (RCM) determines an impact of enough severity (the air bags may or may not be deployed), the post crash alert function activates. The post crash alert function activates the hazard lamp function and cycles the horn on 3 times, then off for 4 seconds, and repeats this cycle until the battery is discharged or the function is turned off. The post crash alert function can be turned off by
- pressing the hazard flasher lamp switch (which may need to be pressed twice).
- pressing the RKE transmitter UNLOCK button.
- pressing the RKE transmitter PANIC button.
Remote Function Actuator (RFA) Module
The Remote Function Actuator (RFA) module (located behind the glove compartment) is equipped on vehicles with Intelligent Access (IA) and controls the following
- Power door locks (vehicles with IA)
- Remote Keyless Entry (RKE) system
- Key validation (part of the Passive Anti-Theft System (PATS)
Refer to the appropriate service information in this article for system specific information and diagnostics.
SPECIAL TOOLS CHART Fluke 77-IV Digital Multimeter FLU77-4 or equivalent Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool Flex Probe Kit NUD105-R025D or equivalent
Scheme 5
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Scheme 7
Gateway Function
The BCM acts as a gateway module by receiving information in one format and transmitting it to other modules using another format. For example, the BCM receives the vehicle speed data from the PCM over the High Speed Controller Area Network (HS-CAN), converts the data into a Medium Speed Controller Area Network (MS-CAN) message and sends (gateways) the message to other network modules such as the HVAC module and the Audio Control Module (ACM). This enables network communication between modules that do not communicate using the same network (HS-CAN or MS-CAN).
SPECIAL TOOLS CHART Fluke 77-IV Digital Multimeter FLU77-4 or equivalent Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool Flex Probe Kit NUD105-R025D or equivalent
SPECIAL TOOLS CHART Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool
Scheme 8
| Item | Part Number | Description |
|---|---|---|
| 1 | Body Control Module (BCM) electrical connectors (part of 14401) | |
| 2 | BCM electrical connectors (part of 14A005) | |
| 3 | BCM electrical connectors (part of 14290) | |
| 4 | W707142 | BCM nut |
| 5 | BCM electrical connector (part of 14290) | |
| 6 | 15604 | BCM |
SPECIAL TOOLS CHART Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool
Scheme 9
| Item | Part Number | Description |
|---|---|---|
| 1 | 19G481 | Remote Function Actuator (RFA) Module |
| 2 | N621903 | RFA module nut (2 required) |
| 3 | RFA module electrical connectors (part of 14401) |