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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 267 (Supplemental Inflatable Restraint System - Except F150) >> Diagnostic Tests >> Test O: Air Bag Tone Warning Indicator Circuit Short To Battery Or Ignition (B1891) >> Possible Causes

Possible Causes

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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 instrument cluster or faulty RCM.

  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. See RESTRAINTS CONTROL MODULE (RCM)  under REMOVAL & INSTALLATION. Access instrument cluster and disconnect 12-pin harness connector C220B. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. See Figure. Turn ignition switch to RUN position. Measure voltage between ground and harness side of RCM connector terminal No. 26 (Light Blue/Black wire). If voltage is more than 0.2 volt, repair short to battery in Light Blue/Black wire. See WIRING DIAGRAMS . Go to step  5. If voltage is less than 0.2 volt, go to next step.

  3. Check air bag tone warning indicator

    Turn ignition switch to OFF position. Reconnect instrument cluster 12-pin harness connector C220B. Turn ignition switch to RUN position. Connect fused jumper wire between ground and RCM connector 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

    Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Perform on-demand self-test. If DTC B1891 was retrieved during on-demand self-test, fault is hard. Go to step  2. If DTC B1891 was not retrieved, fault is intermittent. Check for cause of intermittent short to battery or ignition 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.

  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. DO NOT clear any DTCs until all DTCs have been resolved. 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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