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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 110 (Air Bag Restraint Systems) >> Diagnostic Tests >> Test L: Driver Air Bag Low Resistance (DTC B1934) >> Possible Causes

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.

Driver-side air bag low resistance could be caused by short circuit in clockspring windings, short circuit in wiring harness, low resistance in air bag module, closed shorting bar, damage camming beam or RCM internal fault.

  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 B1934 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC B1934 was not retrieved, fault is intermittent. Go to step  5 .
  2. Check driver-side air bag module

    Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Turn ignition switch to RUN position. Perform on-demand self-test. See ON-DEMAND SELF-TEST  under DIAGNOSTICS. If DTC B1934 is retrieved, go to next step. If DTC B1934 is not retrieved, replace driver-side air bag module. Go to step  6 .
    NOTE: By disconnecting RCM harness connector, circuit No. 614 (Gray/Orange wire) and circuit No. 615 (Gray/White wire) are shorted together by shorting bar. Do not remove shorting bar.
  3. Check driver-side air bag circuit

    Turn ignition switch to OFF position. Access RCM and disconnect harness connector C2005. See RESTRAINTS CONTROL MODULE (RCM)  under REMOVAL & INSTALLATION. Disconnect driver-side air bag simulator from harness connector. Zero ohmmeter. Measure resistance between Gray/Orange and Gray/White wires on harness side of upper clockspring connector. See WIRING DIAGRAMS  . If resistance is less than 10 k/ohms, go to next step. If resistance is more than 10 k/ohms, replace RCM. Go to step  6 .
    NOTE: By disconnecting lower clockspring connector, circuit No. 614 (Gray/Orange wire) and circuit No. 615 (Gray/White wire) are shorted together by shorting bar. Do not remove shorting bar.
  4. Check clockspring

    Disconnect lower clockspring harness connector located at bottom of steering column. Zero ohmmeter. Measure resistance between Gray/Orange and Gray/White wires on vehicle harness side of lower clockspring connector. If resistance is less 10 k/ohms, repair short between Gray/Orange and Gray/White wires. Go to step  6 . If resistance is more than 10 k/ohms, replace clockspring assembly. See CLOCKSPRING  under REMOVAL & INSTALLATION. Go to step  6 .
  5. Check for intermittent fault

    Refer to continuous DTCs recorded in step  1 . If DTC retrieved in step  1 was an intermittent fault, check for cause of intermittent low resistance in Gray/Orange wire, Gray/White wire and clockspring. 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. If DTC retrieved in step  1 was not an 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. DO NOT clear any DTCs until all DTCs have been resolved. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION  table. If no continuous 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.