This vehicle is equipped with a body control module (BCM). The BCM performs multiple body control functions. The following vehicle systems are directly connected to the BCM:

These systems are controlled by the BCMs outputs. The BCM controls its outputs based upon the input information obtained from the sensors and switches that are directly connected to the BCM. The BCM evaluates the input information and controls the body systems by commanding an output on or off.

This vehicle is equipped with 1 of 4 types of BCMs. The BCM type installed on this vehicle is based on the vehicle equipment content and options. The following are the 4 types:

Refer to Entering The Feature Customization Mode for more information on how to identify the BCM type installed.

BCM Type 2

The BCM type 2 provides audible warnings, interior lighting and automatic power door locks.

BCM Type 2E

The BCM type 2E provides all of the features of the BCM Type 2 plus an overspeed warning. The BCM type 2E is installed on export vehicles only.

BCM Type 3

The BCM type 3 provides all of the features of the BCM type 2,2E plus keyless entry. Vehicles with RPO AU0 are equipped with a BCM type 3.

BCM Type 4

The BCM type provides all of the features of the BCM type 2,2E and BCM type 3 plus content theft deterrent. The vehicle with RPO AU0 and UA6 are equipped with a BCM type 4.

Based on the vehicle equipment/options, the body control module (BCM) controls these vehicle systems:

The following are components with audible warnings:

Refer to Audible Warnings Circuit Description for more information.

The following are the areas of interior lighting:

Refer to Interior Lights Circuit Description for more information.

The BCM type 2,2E have the following automatic door lock features:

The BCM type 3 has the following automatic door lock features in addition to the BCM type 2,2E features:

The BCM type 4 has the key cylinder unlock/lock automatic door lock feature in addition to the BCM type 2,2E and BCM type 3 features.

The BCM provides the feature customization of the following door lock functions:

The BCM type 3 provides the following keyless entry features:

The BCM type 4 features a content theft deterrent system which is designed to deter vehicle vandalism and theft. The content theft deterrent system perform the following functions:

The BCM monitors the status of the following components:

The BCM operates the following components according to the mode of system operation:

The BCM also provides feature customization of the following modes. Refer to Content Theft Deterrent (CTD) Circuit Description for more information:

The body control module (BCM) provides diagnostics to assist service technicians during troubleshooting. The BCM has the following diagnostic capabilities when entering the diagnostics mode:

When performing the BCM diagnostics, enter the feature customization mode. During this mode the BCM identifies itself. This ensures that both of the vehicles option content match with the BCM capabilities. In order to enter the feature customization mode perform the following steps:

1. Turn the ignition switch to the LOCK position.
2. Remove the BCM PRGRM fuse.
3. Turn the ignition switch to the ACC position.

Upon entering the feature customization mode, the BCM flashes the fasten belts indicator and sounds the chime 2, 3 or 4 times which is equal to the BCM type used on the vehicle. Ensure that the BCM installed on the vehicle is compatible with all of the features on the vehicle. If not, then replace the BCM with the proper type.

The following vehicle systems have features that can be customized:

Complete the following steps in order to enter the diagnostics mode:

1. Ensure the BCM is in the feature customization mode.
2. Turn the ignition switch from the ACC position to the LOCK position, then back to the ACC position within 1 second.

Complete the following procedure in order to confirm the BCM has entered the diagnostics mode:

1. Ensure that all of the vehicle doors are closed.
2. Open and close any vehicle door.
3. Fasten and release the driver seat belt.

The BCM sounds the chime when receiving an input signal such as opening a door or fastening the driver seat belt when the BCM is in the diagnostics mode.

If the BCM does not sound the chime upon opening a door or fastening the driver seat belt, repeat Step 1 of Entering the Feature Customization Mode. If the BCM does not enter the diagnostics mode, then refer to Diagnostic System Check - Body Control System

Upon entering the diagnostics mode, the BCM flashes the fasten belts indicator and sounds the chime a number of times equal to the DTCs stored in the memory. If no DTCs are stored, the BCM does not flash the fasten belts indicator or sound the chime.

The BCM flashes and sounds the first DTC with the lowest number, pauses, then continues with the next DTC with a higher number until all the DTCs are read. Once all the DTCs are read, the BCM repeats this sequence 3 times.

If there are DTCs in the memory, record the DTCs and refer to Identifying Diagnostic Trouble Codes.

In order to erase the DTCs stored in the BCM press and hold the UNLOCK button on either power door lock switch for 4 seconds while the BCM is in the Diagnostics Mode.

After the BCM reads all the DTCs in the memory, the BCM enters the Input/Output test.

The BCM flashes the fasten belts indicator and sounds the chime once when operating one of the following inputs:

If the BCM does not provide a chime feedback then there is an open or short in the circuit or a faulty component.

Perform the following procedure in order to test the BCM outputs:

1. Ensure that the BCM is in the diagnostics mode
2. Turn the IP dimmer switch to the DOME position

The BCM enters the output test. The output test includes the following tests:

•	Test 1-- De-energizes CKT 1993. Turn off all of the interior lamps.

•	Test 2-- Energizes CKT 1393. Provides power to all of the interior lamps.

•	Test 3-- Grounds CKT 690. Turns on all of the courtesy lamps.

•	Test 4-- Energizes the theft deterrent relay for 1 second by grounding CKT 352. Turns on all of the headlamps (BCM type 4 only).

•	Test 5-- Energizes the horn relay for 25 ms by grounding CKT 28. Sounds the horn (BCM type 4 only).

•	Test 6-- Turns on the theft deterrent indicator lamp by grounding CKT 749 (BCM type 4 only).

•	Test 7-- Turns off the theft deterrent indicator lamp by opening CKT 749 (BCM type 4 only).

The BCM operates the output test in numerical order.

In order to move to the next test, cycle the IP dimmer switch from the dome position, to OFF then back to DOME. The BCM sounds the chime a number of times equivalent to the output test number above.

Perform the following procedure in order to exit the BCM diagnostics mode and return to normal BCM operation:

1. Turn the ignition switch to the LOCK position.
2. Reinstall the BCM PRGRM fuse.
3. Turn the ignition switch to the RUN position.