Possible Causes

AIR BAG warning light circuit open or short to ground could be caused by instrument cluster circuit failure, open or short in wiring harness, faulty light bulb, or damaged or inoperative RCM.

1. Check circuit for open or short to ground
   
   Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Access RCM and disconnect harness connector C424. See RESTRAINTS CONTROL MODULE (RCM)  under REMOVAL & INSTALLATION. Access instrument cluster and disconnect harness connector. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Measure resistance of Black-Green wire between RCM harness connector C424, terminal No. 4 and instrument cluster connector terminal No. 22. See Figure & Figure . Resistance should be less than 5 ohms. Measure resistance between ground and RCM harness connector C424, terminal No. 4 (Black-Green wire). Resistance should be more than 10 k-ohms. If resistances are as specified, go to next step. If resistances are not as specified, repair short to open in Black-Green wire. See WIRING DIAGRAMS . Activate air bag system. See ACTIVATING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Clear DTCs. See CLEARING FAULT CODES  under DIAGNOSTICS. Perform on-demand self-test. See ON-DEMAND SELF-TEST  under DIAGNOSTICS.
2. Check instrument cluster
   
   Turn ignition switch to OFF position. Reconnect instrument cluster harness connector. Turn ignition switch to RUN position. Connect fused jumper wire between ground and RCM harness connector C424, terminal No. 4 (Black-Green wire) while observing AIR BAG warning light. If AIR BAG warning light is illuminated with jumper wire connected and not illuminated with jumper wire disconnected, replace RCM. Activate air bag system. Clear DTCs. Perform on-demand self-test. If AIR BAG warning light does not illuminate or is illuminated continuously, replace instrument cluster. Activate air bag system. Clear DTCs. Perform on-demand self-test.