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Possible Causes

WARNING: This page is about a different car, the 2002 Lincoln Navigator and 2002 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

A left side crash sensor communication fault could be caused by damaged White/Light Green wire (circuit No. 1261), damaged Brown/Light Green wire (circuit No. 1262) or damaged left side crash sensor.

  1. Check for continuous or on-demand DTCs

    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. Clear continuous DTCs. See CLEARING FAULT CODES  under DIAGNOSTICS. Perform on-demand self-test. See ON-DEMAND SELF-TEST  under DIAGNOSTICS. If DTC U2017 was retrieved during on-demand self-test, go to next step. If DTC U2017 was not retrieved, fault is intermittent. Go to step  9 .

  2. Check left side crash sensor harness connector

    Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Access left side crash sensor. See SIDE CRASH SENSOR  under REMOVAL & INSTALLATION. Ensure side crash sensor harness connector is properly connected to sensor. If side crash sensor is connected correctly, go to next step. If side crash sensor is not connected correctly, reconnect connector. Go to step  10 .

  3. Check circuit for open

    Turn ignition switch to OFF position. Access RCM and disconnect harness connector C2004. See RESTRAINTS CONTROL MODULE (RCM)  under REMOVAL & INSTALLATION. Disconnect left side crash sensor connector. Measure resistance of White/Light Green wire between harness side of RCM connector C2004, terminal No. 8 and harness side of left side crash sensor connector. See Figure . If resistance is more than one ohm, repair open in White/Light Green wire. See WIRING DIAGRAMS  . Go to step  10 . If resistance is less than one ohm, go to next step.

  4. Check circuit for open

    Measure resistance of Brown/Light Green wire between harness side of RCM connector C2004, terminal No. 9 and harness side left side crash sensor connector. If resistance is more than one ohm, repair open in Brown/Light Green wire. Go to step  10 . If resistance is less than one ohm, go to next step.

  5. Check circuit for short to ground

    Disconnect RCM connector C2005. Measure resistance between harness side of RCM connector C2004, terminal No. 8 (White/Light Green wire) and harness side of RCM connector C2005, terminal No. 21 (Black/Orange wire, circuit No. 649). If resistance is less than 1000 ohms, repair short to ground in White/Light Green wire. Go to step  10 . If resistance is more than 1000 ohms, go to next step.

  6. Check circuit for short to ground

    Measure resistance between harness side of RCM connector C2004, terminal No. 9 (Brown/Light Green wire) and harness side of RCM connector C2005, terminal No. 21 (Black/Orange wire). If resistance is less than 1000 ohms, repair short to ground in Brown/Light Green wire. Go to step  10 . If resistance is more than 1000 ohms, go to next step.

  7. Check circuit for short to battery or ignition

    Turn ignition switch to OFF position. Disconnect negative battery cable. Turn ignition switch to RUN position. Measure resistance between harness side of RCM connector C2004, terminal No. 8 (White/Light Green wire) and harness side of RCM connector C2005, terminal No. 2 (Violet/Orange wire, circuit No. 298). If resistance is less than 10 k/ohms, repair short to battery or ignition in White/Light Green wire. Go to step  10 . If resistance is more than 10 k/ohms, go to next step.

  8. Check circuit for short to battery or ignition

    Measure resistance between harness side of RCM connector C2004, terminal No. 9 (Brown/Light Green wire) and harness side of RCM connector C2005, terminal No. 2 (Violet/Orange wire). If resistance is less than 10 k/ohms, repair short to battery or ignition in Brown/Light Green wire. Go to step  10 . If resistance is more than 10 k/ohms, replace side crash sensor. Go to step  10 .

  9. Check for intermittent fault

    Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Refer to continuous DTCs recorded in step  1 . If DTC retrieved in step  1 was a intermittent fault, check for cause of intermittent communication fault. 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 a intermittent fault, go to next step.

  10. 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. DO NOT clear any DTCs until all DTCs have been resolved. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION  table. 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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