Body Control Module: Service and Repair

Replacing the BCM (Body Control Module) for Models with Auto A/C
The BCM unit for models equipped with auto A/C's (air conditioners) is provided with an auto A/C amplifier.
The BCM and auto A/C amplifier must be replaced independently with new ones as described below:

CAUTION:
^ Never handle the BCM unit with dirty hands (wet with oil, grease, etc.).
^ When handling the BCM unit, hold the case as much as possible.
^ Do not attempt to touch parts on the PC board unless absolutely necessary. Doing so may damage affected circuits or parts.
^ The BCM unit consists of two cases-the BCM case and the A/C auto amplifier case. These cases are interconnected with a sub-harness. Be careful not to break the sub-harness while handling them.
^ The "BCM SIDE" is stamped on the BCM case. The "A/C AUTO AMP" is stamped on the A/C auto amplifier case.
Be careful not to confuse one case with the other during replacement.

To replace either of the cases with a new one, proceed as follows:

Replacing The BCM (Body Control Module) For Models With Auto A/C:

1. Using a Phillips driver, remove the two screws.

Replacing The BCM (Body Control Module) For Models With Auto A/C:

2. With the "A/C AUTO AMP SIDE" mark toward you and facing up, open the front of the case and then flip it open to the right.

CAUTION: The BCM case and A/C auto amplifier case are interconnected with a sub-harness. Be careful not to break the sub-harness.

Replacing The BCM (Body Control Module) For Models With Auto A/C:

3. While holding the 4 wires of sub-harness, disconnect the sub- harness connector from the mating connector.

CAUTION:
Be sure to pull connector straight out.
4. Prepare a new BCM. The old A/C auto amplifier case can be re-used.
5. Connect the BCM-side connector to the A/C auto amplifier-side connector.

CAUTION: Be sure to connect the BCM-side connector until a "click" is heard. If it does not connect properly, the auto A/C will not operate properly.

Replacing The BCM (Body Control Module) For Models With Auto A/C:

6. With the "A/C AUTO AMP SIDE" mark facing upward, engage the back side of the case first, then close the case.

CAUTION: Do not allow the sub-harness to be caught in the cases.

7. Using a Phillips driver, tighten the two screws to a torque of 0.4 to 0.6 N-m (4.1 to 6.1 kg-cm, 3.6 to 5.3 in-lb).

CAUTION:
^ Be sure the two cases are in close contact with each other and are secure while tightening the screws.
^ Do not overtighten the screws since it may break the case.

8. Following BCM case replacement, make sure that:
a. The BCM and A/C auto amplifier-side connectors are properly connected to the body-side connector.
b. Perform IVMS communication diagnosis.
c. Check that the auto A/C operates properly.