Possible Causes
WARNING: This page is about a different car, the 2002 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
Air bag tone warning indicator circuit short to ground or open could be caused by short to ground or open in Light Blue/Black wire (circuit No. 1083), damaged or inoperative instrument cluster or RCM internal fault.
- 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 B1892 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC B1892 was not retrieved, fault is intermittent. Go to step 5 . - 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 resistance between harness side of RCM connector C2041A, terminals No. 21 (Black wire, circuit No. 57) and No. 26 (Light Blue/Black wire). See Figure . If resistance is more than 10 k/ohm, go to next step. If resistance is less than 10 k/ohm, repair short to ground in Light Blue/Black wire. See WIRING DIAGRAMS . Go to step 6 . - Check air bag tone warning indicator circuit
Measure resistance between harness side of RCM connector C2041A, terminal No. 26 and harness side of instrument cluster connector C220A, terminal No. 5 (Light Blue/Black wire). If resistance is more than 10 ohms, repair open in Light Blue/Black wire. Go to step 6 . If resistance is less than 10 ohms, go to next step. - Check air bag tone warning indicator
Reconnect instrument cluster harness connector C220A. Turn ignition to RUN position. Measure voltage between ground and harness side of RCM connector, terminal No. 26 (Light Blue/Black wire). If voltage is less than one volt, replace instrument cluster. Go to step 6 . If voltage is more than one volt, replace RCM. Go to step 6 . - 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. - 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.