Possible Causes

Air bag tone warning indicator circuit short to battery or ignition voltage could be caused by short to battery or ignition voltage in Light Blue/Black wire (circuit No. 1083), damaged or inoperative instrument cluster or RCM internal fault.

1. Check for hard or intermittent DTC
   
   Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). See USING SCAN TOOL  under DIAGNOSTICS. Turn ignition switch to RUN position. Retrieve and record any continuous DTCs. See RETRIEVING FAULT CODES  under DIAGNOSTICS. Perform on-demand self-test. See ON-DEMAND SELF-TEST  under DIAGNOSTICS. If DTC B1891 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC B1891 was not retrieved, fault is intermittent. Go to step  4 .
2. Check air bag tone warning indicator circuit
   
   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 C2041A. See RESTRAINTS CONTROL MODULE (RCM)  under REMOVAL & INSTALLATION. Access and disconnect instrument cluster harness connector C220A. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Measure voltage between ground and harness side of RCM connector C2041A, terminal No. 26 (Light Blue/Black wire). See Figure . If voltage is less than 0.2 volt, go to next step. If voltage is more than 0.2 volt, repair short to ground in Light Blue/Black wire. See WIRING DIAGRAMS  . Go to step  5 .
3. Check air bag tone warning indicator
   
   Turn ignition switch to OFF position. Reconnect instrument cluster harness connector C220A. Turn ignition to RUN position. Connect fused jumper wire between ground and harness side of RCM connector C2041A, terminal No. 26 (Light Blue/Black wire). Listen for audible warning tone. If warning tone was heard, replace RCM. Go to step  5 . If warning tone was not heard, replace instrument cluster. Go to step  5 .
4. Check for intermittent fault
   
   Refer to continuous DTCs recorded in step  1 . If DTC retrieved in step  1 was an intermittent fault, check for cause of intermittent short to ground or open in Light Blue/Black wire. See WIRING DIAGRAMS  . Attempt to recreate fault by flexing wire harness and cycling ignition switch frequently. Repair any intermittent problems found. Go to next step. If DTC retrieved in step  1 was not an intermittent fault, go to next step.
5. Check for additional DTCs
   
   Refer to continuous DTCs recorded in step  1 . If any continuous DTCs were retrieved, go to diagnostic trouble code identification table for direction to appropriate test. DO NOT clear any DTCs until all DTCs have been resolved. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION  table. If no continuous DTCs were retrieved, reconnect air bag system. Activate air bag system. See ACTIVATING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Clear all DTCs. See CLEARING FAULT CODES  under DIAGNOSTICS.