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.
- 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.
- The tightening torque of the air bag restraints control module (RCM) retaining bolts is critical for correct system operation.
CAUTION: Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage can result.
NOTE:
- When installing a new RCM, always make sure the correct RCM is being installed. If an incorrect RCM is installed, erroneous DTCs will result.
- 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.
- 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 carry out the diagnostic procedure again.
1. Depower the system.
2. If equipped, remove the floor console.
3. If equipped, remove the 20 percent front seat cushion. Pull up to release the retainers on the 20 percent seat cushion and remove.
4. Disconnect the restraints control module (RCM) large 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 RCM small electrical connector.
6. Remove the RCM bolts.
7. Remove the RCM.
Installation
1. Position the RCM and install the bolts.
- Tighten to 12 Nm (9 lb-ft).
2. Make sure the connector position assurance lever is in the full RELEASE position before attempting to connect the connector.
3. CAUTION: Putting the large RCM electrical connector into the RCM on an angle can cause bad electrical connections and damage components.
NOTE: The RCM has been removed for clarity.
Position the large RCM electrical connector into the RCM.
- CAUTION: Do not push the 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.
With the large RCM electrical connector uniformly aligned to the RCM, lightly push in until a subtle audible click is heard and a slight resistance is felt.
4. NOTE: The RCM has been removed for clarity.
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.
5. Connect the restraints control module (RCM) small electrical connector.
6. If equipped, install the floor console.
7. If equipped, install the 20 percent front seat cushion. Align the retainers on the 20 percent seat cushion and press down firmly near the front of the cushion to seat the retainers.
8. Repower the system.