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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 U: Seat Track Position Sensor Circuit Short To Ground (DTC C1947) >> Possible Causes

Possible Causes

A seat track position sensor short to ground circuit fault could be caused by damaged wiring, terminals or connectors or a 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 C1947 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC C1947 was not retrieved, fault is intermittent. Go to step  6 .

  2. Check circuit for short to ground between left front seat & RCM

    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  under REMOVAL & INSTALLATION. Disconnect left front seat floor connector C311. Measure resistance between ground and vehicle harness side of left front seat floor connector C311, terminal No. 5 (Light Green wire, circuit No. 1520). See Figure . Measure resistance between ground and vehicle harness side of left front seat floor connector C311, terminal No. 4 (Tan/Black wire, circuit No. 1558). If resistance is more than one megohm in both circuits, go to next step. If resistance is less than one megohm in either circuit, repair short to ground in appropriate wire. See WIRING DIAGRAMS  . Go to step  7 .

  3. Check circuit for short to ground in left front seat

    Reconnect left front seat floor connector C311. Disconnect seat track position sensor connector. Measure resistance in Light Green wire between ground and harness side of seat track position sensor connector. Measure resistance in Tan/Black wire between ground and harness side of seat track position sensor connector. If resistance is more than one megohm in both circuits, replace RCM. Go to step  7 . If resistance is less than one megohm in either circuit, repair short to ground in appropriate wire. Go to step  7 .

  4. Check seat track position sensor

    Reconnect RCM connector C310A. Install known-good seat track position sensor. See SEAT TRACK POSITION SENSOR  under REMOVAL & INSTALLATION. Position left front seat in vehicle. Reconnect seat floor harness connector C311. Turn ignition switch to RUN position. Perform on-demand self-test. If DTC C1947 was retrieved during on-demand self-test, go to next step. If DTC C1947 was not retrieved, fault is corrected. Go to step  7 .
    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.

  5. Confirm RCM Fault

    Turn ignition switch to OFF position. Reinstall original seat track position sensor. Turn ignition switch to RUN position. Perform on-demand self-test. If DTC C1947 was retrieved during on-demand self-test, replace RCM. Go to step  7 . If DTC C1947 was not retrieved during on-demand self-test, fault is corrected. Go to step  7 .

  6. 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 C1947 was retrieved during on-demand self-test, go to step  2 . If DTC C1947 was not retrieved during on-demand self-test, check for cause of intermittent fault. Attempt to recreate fault by flexing wire harness and cycling ignition switch frequently. Repair any intermittent problems found. Go to next step.

  7. 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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