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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 269 (Air Bag Restraint Systems) >> Diagnostic Tests >> Test E: Air Bag Tone Warning Indicator Circuit Short To Ground Or Open (DTC B1892) >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2004 Lincoln LS. 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 damaged wiring harness, terminals or connectors, faulty 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 ON position. Retrieve and record any continuous Diagnostic Trouble Codes (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 .

  2. Check air bag tone warning indicator circuit for short to ground

    Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Access RCM and disconnect connector C310A. See RESTRAINTS CONTROL MODULE (RCM)  under REMOVAL & INSTALLATION. Access instrument cluster and disconnect harness connector C220A. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Measure resistance between harness side of RCM connector C310A, terminals No. 22 (White/Black wire, circuit No. 8-GE52) and No. 16 (Black/Red wire, circuit No. 31-JA10). See Figure . If resistance is more than one megohm, go to next step. If resistance is less than one megohm, repair short to ground in White/Black wire. See WIRING DIAGRAMS  . Go to step  6 .

  3. Check air bag tone warning indicator circuit for open

    Turn ignition switch to OFF position. Measure resistance between harness side of RCM connector C310A, terminal No. 22 and harness side of instrument cluster connector C220A, terminal No. 18 (White/Black wire). See Figure & Figure . If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in White/Black wire. Go to step  6 .

  4. Check air bag tone warning indicator

    Reconnect instrument cluster connector C220A. Turn ignition switch to ON position. Measure voltage between ground and harness side of RCM connector C310A, terminal No. 22 (White/Black wire). If voltage is more than 10 volts, replace RCM. Go to step  6 . If voltage is less than 10 volts, replace instrument cluster. Go to step  6 .

  5. Check for intermittent fault

    Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Perform on-demand self-test. If DTC B1892 was retrieved during on-demand self-test, go to step  2 . If DTC B1892 was not retrieved during on-demand self-test, check for cause of intermittent short to ground or open in White/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.

  6. 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 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. Clear all DTCs. See CLEARING FAULT CODES  under DIAGNOSTICS.
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