Restraints and Safety Systems: Testing and Inspection

Diagnostic Trouble Code (DTC) Index

Restraints control module (RCM)

WARNING: TO AVOID ACCIDENTAL DEPLOYMENT AND POSSIBLE PERSONAL INJURY, THE BACKUP POWER SUPPLY MUST BE DEPLETED BEFORE REPAIRING OR REPLACING ANY AIR BAG SUPPLEMENTAL RESTRAINT SYSTEM (SRS) COMPONENTS. TO DEPLETE THE BACKUP POWER SUPPLY ENERGY, DISCONNECT THE BATTERY GROUND CABLE AND WAIT ONE MINUTE. FAILURE TO FOLLOW THIS INSTRUCTION MAY RESULT IN PERSONAL INJURY.

CAUTION: Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being checked and/or the donor vehicle.

NOTE:
Given the legal implications of a restraints system failure, harness repairs to Air Bag module circuits are not acceptable. Where the text refers to "REPAIR the circuit", this will normally mean the replacement of a harness.

NOTE:
If the control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual (section B1.2), or determine if any prior approval programme is in operation, prior to the installation of a new module/component.

NOTE:
When performing electrical voltage or resistance checks, always use a digital multimeter (DMM) accurate to three decimal places, and with an up-to-date calibration certificate. When checking resistance, always take the resistance of the DMM leads into account.

NOTE:
Check and rectify basic faults before beginning diagnostic routines involving pinpoint checks.

NOTE:
Inspect connectors for signs of water ingress, and pins for damage and/or corrosion.

NOTE:
If DTCs are recorded and, after performing the pinpoint checks, a fault is not present, an intermittent concern may be the cause. Always check for loose connections and corroded terminals.
The table below lists all Diagnostic Trouble Codes (DTCs) that could be logged in the Restraints control module, for additional Diagnosis and Testing information refer to the relevant Diagnosis and Testing Section. For additional information, refer to Air Bag Supplemental Restraint System (SRS) Inspection and Verification