Air Bag Control Module: Service and Repair

RESTRAINTS CONTROL MODULE (RCM)







Removal

WARNING:
- Always wear safety glasses when repairing an air bag supplemental restraint system (SRS) vehicle and when handling an air bag module. This will reduce the risk of injury in the event of an accidental deployment.
- Do not handle, move or change the original horizontal mounting position of the restraints control module (RCM) while the RCM is connected and the ignition switch is ON. Failure to follow these instructions may result in the inadvertent deployment of the safety canopy and risk of personal injury.
- The restraints control module (RCM) orientation is critical for correct air bag supplemental restraint system (SRS) operation. If a vehicle equipped with an SRS system has been involved in a collision in which the center tunnel area has been damaged, inspect the mounting and bracket for deformation. If damaged, the RCM must be replaced whether or not the air bags have deployed. In addition, make sure the area of the RCM mounting is restored to its original condition.
- Vehicle sensor orientation is critical for proper system operation. If a vehicle equipped with an air bag supplemental restraint system (SRS) is involved in a collision, inspect the sensor mounting bracket and wiring pigtail for deformation. Replace and properly position the sensor or any other damaged SRS components whether or not the air bag is deployed.
- To reduce the risk of personal injury, do not use any memory saver devices.

CAUTION:
- When installing a new restraints control module (RCM), always make sure the correct RCM is being installed. The RCM 40-pin connector is keyed differently for vehicles with safety canopies and side air bags than the 40-pin connector for vehicles without safety canopies and side air bags. Do not force the 40-pin connector onto the RCM. If the connector is forced onto the RCM, damage to the RCM and/or connector will occur.
- Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage can result.

NOTE:
- The air bag warning lamp illuminates when the RCM fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault.
- When installing a new restraints control module (RCM), always make sure the correct RCM is being installed. If an incorrect RCM is installed, erroneous DTCs will result.
- The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
- Repair is made by installing a new part only. If the new part does not correct the condition, install the original part and perform the diagnostic procedure again.

1. Depower the system.
2. Remove the 4 utility compartment scrivets.

3. NOTE: If equipped, disconnect the electrical connectors necessary for removal.

Remove the utility compartment.







4. Disconnect the large RCM electrical connector.
1 Pinch the thumb tab and pivot the connector position assurance lever all the way back until it stops.
2 Pull out and disconnect the RCM electrical connector.

5. Disconnect the small RCM electrical connector.
6. Remove the 4 RCM bracket bolts.
7. Remove the RCM bracket and the RCM.

Installation
1. Install the RCM bracket and RCM in the vehicle.

2. WARNING: The tightening torque of the air bag restraints control module (RCM) retaining bolts is critical for correct system operation.

Install the 4 RCM bracket bolts.
- Tighten to 12 Nm (9 lb-ft).







3. Make sure the large RCM electrical connector position assurance lever is in the full release position before attempting to connect the connector.







4. CAUTION:
- Putting the large RCM electrical connector into the RCM on an angle can cause bad electrical connections and damage components.
- Do not push the electrical connector on to where the lever pivots and seats itself. Light pressure is needed to get the connector into position on the RCM before using the lever to fully seat the connector.

Position the large RCM connector into the RCM.
- With the large RCM electrical connector uniformly aligned to the RCM, lightly push in until a audible click is heard and a slight resistance is felt.







5. Connect the large RCM electrical connector.
- Using the connector position assurance lever, pivot it toward the RCM, drawing the connector into the RCM.
- Make sure the thumb tab is engaged to the retainer on the RCM and locked in place.

6. Connect the small RCM electrical connector.
7. Install the utility compartment and 4 scrivets.
8. Repower the system.