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Home >> Ford >> 2001 >> Mustang Base, 2D Convertible, Automatic >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Supplemental Inflatable Restraint System >> Diagnostic Tests >> Test O: Air Bag Tone Warning Indicator Circuit Short To Battery Or Ignition (DTC B1891) >> Possible Causes

Possible Causes

Air bag tone warning indicator circuit shorted 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 GEM or an RCM internal fault.

  1. Check for hard or intermittent DTC

    Ensure ignition is off. 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 DIAGNOSTIC TROUBLE CODES (DTCS)  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. Leave negative battery cable disconnected. Access RCM and disconnect harness connector. See RESTRAINTS CONTROL MODULE (RCM)  under REMOVAL & INSTALLATION. Access and disconnect GEM connector C352. See GENERIC ELECTRONIC MODULE (GEM)  under REMOVAL & INSTALLATION. Turn ignition switch to RUN position. Measure resistance between RCM harness connector terminals No. 26 (Light Blue-Black wire) and No. 2 (White-Orange wire). See Figure . If resistance is less than 10 megohms, repair short to battery or ignition voltage in Light Blue-Black wire (circuit No. 1083). See WIRING DIAGRAMS  . Go to step  5 . If resistance is more than 10 megohms, go to next step.

  3. Check air bag tone warning indicator

    Turn ignition switch to OFF position. Reconnect negative battery cable. Reconnect GEM connector C352. Turn ignition switch to RUN position. Connect fused jumper wire between ground and RCM connector terminal No. 26 (Light Blue-Black wire). If GEM generates a tone, replace RCM. Go to step  5 . If GEM does not generate a tone, replace GEM. Go to step  5 .

  4. Check for intermittent fault

    Refer to continuous DTCs recorded in step  1 . If DTC retrieved in step  1 was a intermittent fault, check for cause of intermittent short to battery or ignition voltage on Light Blue-Black wire (circuit No. 1083). 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 a 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 appropriate test. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION  table. DO NOT clear any DTCs until all DTCs have been resolved. If no 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 DIAGNOSTIC TROUBLE CODES (DTCS)  under DIAGNOSTICS.
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