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Supplemental Restraint System - Air Bag Supplemental Restraint System Diagnosis and Testing Principles of Operation For a detailed description of the air bag supplemental restraints system, refer to the relevant Description and Operation Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System, Description and Operation). Inspection and Verification WARNING: TO AVOID ACCIDENTAL DEPLOYMENT AND POSSIBLE PERSONAL INJURY, THE BACKUP POW ER SUPPLY MUST BE DEPLETED BEFORE REPAIRING OR REPLACING ANY AIR BAG SUPPLEMENTAL RESTRAINT SY STEM (SRS) 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 tested and/or the donor • NOTE: Given the legal implications of a restraints system failure, harness repairs to Air Bag module circuits are not 1. Verify the customer concern. 1. 2. Visually inspect for obvious signs of damage. 2. Visual Inspection Electrical Battery condition, state of charge 3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step 3. 4. If the cause is not visually evident, check Restraints Control Module (RCM) and Occupancy Classification System (OCS) module for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index. 4. Given the complexity of the system and the potential for damage/injury, the preferred method of diagnosis is via the If the Manufacturer approved diagnostic system is not available, use a scan tool to extract DTCs and refer to the DTC DTC Index • NOTE: If the control module is suspect and the vehicle remains under manufacturer warranty, refer to the W arranty Policy • NOTE: Generic scan tools may not read the codes listed, or may read only five digit codes. Match the five digits from the • NOTE: When performing electrical voltage or resistance tests, always use a digital multimeter (DMM) accurate to three • NOTE: Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests. • 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 tests, a fault is not present, an intermittent concern may For a complete list of all Diagnostic Trouble Codes (DTCs) that could be logged on this vehicle, please refer to Section REFER to: Diagnostic Trouble Code (DTC) Index - DTC: Restraints Control Module (RCM) (100-00 General Information, Description and Operation). |