Possible Causes
WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
Air bag tone warning indicator circuit shorted to ground or open could be caused by short to ground or open in Light Blue/Black wire or damaged or inoperative GEM.
- 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. See RESTRAINTS CONTROL MODULE (RCM) under REMOVAL & INSTALLATION. Access GEM and disconnect harness connector C201A. See GENERIC ELECTRONIC MODULE (GEM) under REMOVAL & INSTALLATION. Measure resistance between RCM connector terminals No. 26 (Light Blue/Black wire) and No. 21 (Black/Orange wire, circuit No. 649). See Figure . If resistance is more than 10 k/ohms, go to next step. If resistance is less than 10 k/ohms, repair short to ground in Light Blue/Black wire. See WIRING DIAGRAMS . Go to step 6 . - Check air bag tone warning indicator circuit for open
Measure resistance of Light Blue/Black wire between RCM connector terminal No. 26 and GEM connector C201A, terminal No. 20. See Figure & Fig 1 . If resistance is less than 100 ohms, go to next step. If resistance is more than 100 ohms, repair open in Light Blue/Black wire. Go to step 6 . - Check air bag tone warning indicator
Disconnect GEM connector C201A. Turn ignition to RUN position. Measure voltage between ground and RCM connector terminal No. 26 (Light Blue/Black wire). See Figure . If voltage is less than one volt, replace GEM. 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 on 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. Prove out system. See PROVE OUT SYSTEM under DIAGNOSTICS. Clear all DTCs. See CLEARING FAULT CODES under DIAGNOSTICS.