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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Inflatable Restraint System >> Diagnostic Tests >> Test Ad: Right Side Crash Sensor Communication Fault (DTC U2018) >> Possible Causes

Possible Causes

A right side crash sensor communication fault could be caused by damaged wiring, damaged right side crash sensor or RCM internal fault.

  1. Check for hard or intermittent DTCs

    Ensure ignition is off. Connect scan tool to 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 U2018 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC U2018 was not retrieved, fault is intermittent. Go to step  4 .
    NOTE: While measuring resistance in following test, operate various electrical systems such as radio, windows and blower motor.

  2. Check for short to battery

    Turn ignition off. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Leave negative battery cable disconnected. Access and disconnect both RCM harness connectors. See RESTRAINTS CONTROL MODULE  under REMOVAL & INSTALLATION. Turn ignition switch to RUN position. Measure resistance between RCM harness connectors C310A, terminal No. 1 (White/Yellow wire) and C310B, terminals No. 18 (White wire) and No. 19 (Brown wire). See Figure . If resistance is more than 10 k/ohms, go to next step. If resistance is less than 10 k/ohms, repair short to battery in White and/or Brown wires. Go to step  5 .

  3. Check sensor circuits

    Access right side crash sensor. See SIDE CRASH SENSOR  under REMOVAL & INSTALLATION. Measure resistance of White wire between RCM harness connector C310B, terminal No. 19 and right side crash sensor harness connector. See Figure . Measure resistance of Brown wire between RCM harness connector C310B, terminal No. 18 and right side crash sensor harness connector. If both resistances are less than 10 ohms, install known-good side crash sensor. Go to next step. If any resistance is more than 10 ohms, repair high resistance in White and/or Brown wires. Go to step  5 .

  4. Check DTCs

    Activate air bag system. See ACTIVATING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Perform on-demand self-test. If DTC U2018 was retrieved during on-demand self-test, replace RCM. Reinstall original side crash sensor and go to step  6 . If DTC U2018 was not retrieved during on-demand self-test, system if functioning properly. Go to step  6 .

  5. Check for intermittent fault

    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.

  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. If no DTCs were retrieved, reconnect air bag system. Activate air bag system. See ACTIVATING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Prove out system. Clear all DTCs. See CLEARING FAULT CODES  under DIAGNOSTICS.
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