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Home >> Ford >> 2002 >> Crown Victoria Base, 4.6 9 >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Inflatable Restraint System >> Diagnostic Tests >> Test B: Air Bag Warning Light Circuit Open Or Short To Ground (DTC B1869) >> Possible Causes

Possible Causes

AIR BAG warning light inoperative condition could be caused by damaged wiring, terminals or connectors, faulty RCM, faulty AIR BAG warning light or instrument cluster module malfunction.

  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 B1869 was retrieved during on-demand self-test and AIR BAG warning light does not illuminate, go to next step. If DTC B1869 was retrieved during on-demand self-test and AIR BAG warning light does illuminate, go to step  8 . If DTC B1869 was not retrieved, fault is intermittent. Go to step  10 .

  2. Check circuit No 640

    Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. On models with analog instrument cluster, access instrument cluster and disconnect instrument cluster module harness connector C2220B. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. On models with digital instrument cluster, access instrument cluster and disconnect warning light module harness connector C2222, located near instrument cluster. On all models, turn ignition switch to ON position. On models with analog instrument cluster, measure voltage between ground and harness side of instrument cluster module connector C2220B, terminal No. 6 (Red/Yellow wire, circuit No. 640). See Figure . On models with digital instrument cluster, measure voltage between ground and harness side of warning light module connector C2222, terminal No. 8 (Red/Yellow wire). See Figure . On models with analog instrument cluster, if voltage is 9-16 volts, go to next step. On models with digital instrument cluster, if voltage is 9-16 volts, go to step  6 . On all models, if voltage is not 9-16 volts, repair Red/Yellow wire as necessary. See WIRING DIAGRAMS  . Go to step  11 .

  3. Check instrument cluster AIR BAG warning light circuit for open

    Turn ignition switch to OFF position. Measure resistance between component side of instrument cluster module connector C2220B, terminals No. 6 and 11. If resistance is less than 500 ohms, go to step  6 . If resistance is more than 500 ohms, go to next step.

  4. Check AIR BAG warning light bulb

    Remove AIR BAG warning light bulb from instrument cluster. Visually inspect bulb. If bulb is damaged or the filament is open, replace bulb and go to next step. If bulb is okay, replace instrument cluster module. Go to step  11 .

  5. Check instrument cluster AIR BAG warning light circuits

    Measure resistance between component side of instrument cluster module connector C2220B, terminals No. 6 and 11. If resistance is less than 500 ohms, fault is corrected. Go to step  11 . If resistance is more than 500 ohms, replace instrument cluster. Go to step  11 .

  6. Check circuit No. 608 for open

    Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Access and disconnect RCM connector C310B. See RESTRAINTS CONTROL MODULE  under REMOVAL & INSTALLATION. On models with analog instrument cluster, measure resistance between ground and harness side of instrument cluster module connector C2220B, terminal No. 11 (Black/Yellow wire, circuit No. 608). See Figure . On models with digital instrument cluster, measure resistance between ground and harness side of warning light module connector C2222, terminal No. 1 (Black/Yellow wire). See Figure . On all models, if resistance is less than 0.5 ohm, go to next step. If resistance is more than 0.5 ohm, repair open in Black/Yellow wire. Go to step  11 .
    NOTE: Ensure all air bag system simulators, sensor electrical connectors and RCM electrical connectors are connected prior to carrying out on-demand self-test or erroneous faults may be set.

  7. Confirm RCM fault

    Reconnect RCM and instrument cluster connectors. Perform on-demand self-test. If DTC B1869 was retrieved during on-demand self-test, replace RCM. Go to step  11 . If DTC B1869 was not retrieved during on-demand self-test, go to step  11 .

  8. Check circuit No. 608 for short to ground

    Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. On models with analog instrument cluster, access instrument cluster and disconnect instrument cluster module harness connector C2220B. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. On models with digital instrument cluster, access instrument cluster and disconnect warning light module harness connector C2222, located near instrument cluster. On models with analog instrument cluster, measure resistance between ground and harness side of instrument cluster module connector C2220B, terminal No. 11 (Black/Yellow wire, circuit No. 608). See Figure . On models with digital instrument cluster, measure resistance between ground and harness side of warning light module connector C2222, terminal No. 1 (Black/Yellow wire). See Figure . On all models, if resistance is less than one megohm, go to next step. If resistance is more than one megohm, repair or replace instrument cluster. Go to step  11 .

  9. Check for RCM short to ground

    Access and disconnect RCM connector C310B. See RESTRAINTS CONTROL MODULE  under REMOVAL & INSTALLATION. Measure resistance between ground and component side of RCM connector C310B, terminal No. 9. If resistance is less than 800 ohms, replace RCM. Go to step  11 . If resistance is more than 800 ohms, repair short to ground in Black/Yellow wire. Go to step  11 .

  10. 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 B1869 was retrieved during on-demand self-test, go to step  2 . If DTC B1869 was not retrieved during on-demand self-test, check for cause of intermittent short to ground or open in Black/Yellow wire (circuit No. 608). 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.

  11. 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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