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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Air Bag Restraint Systems >> Diagnostic Tests >> Test O: Air Bag Secondary Warning Indicator Circuit Short To Battery Or Ignition (B1891) >> Possible Causes

Possible Causes

Air bag secondary warning indicator circuit shorted to battery or ignition voltage could be caused by short to battery or ignition voltage in Black/Green wire or damaged or inoperative instrument cluster.

  1. Check for hard or intermittent DTC

    Ensure ignition is off. Connect NGS tester to DLC. See USING NGS TESTER  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 secondary warning indicator circuit

    Turn ignition off. 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  under REMOVAL & INSTALLATION. Access instrument cluster and disconnect connector C808A (16-pin). See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Turn ignition switch to RUN position. Measure resistance between RCM harness connector terminals No. 26 (Black/Green wire) and No. 2 (Green/Orange wire). If resistance is less than 10 k/ohms, repair short to battery in Black/Green wire and go to step  5 . If resistance is more than 10 k/ohms, go to next step.

  3. Check air bag secondary warning indicator

    Turn ignition off. Reconnect negative battery cable. Reconnect instrument cluster connector C808A. Turn ignition to RUN position. Connect fused jumper wire between ground and RCM connector terminal No. 26 (Black/Green wire). If secondary warning LED illuminates, check wiring harness for corrosion. If wiring harness is damaged, repair/replace as necessary. Go to step  5 . If wiring harness is okay, replace RCM. Go to step  5 . If secondary warning LED does not illuminate, check wiring harness for corrosion. If wiring harness is damaged, repair/replace as necessary. Go to step  5 . If wiring harness is okay, 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 battery or ignition voltage on Black/Green wire. 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. 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.
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