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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 106 (Supplemental Inflatable Restraint System - F150 Pickup) >> Diagnostic Tests >> Test W: Passenger Air Bag Circuit Resistance Low (DTC B1935) >> Possible Causes

Possible Causes

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

Passenger-side air bag low resistance could be caused by short circuit in wiring harness, low resistance in passenger-side air bag module, closed shorting bar, damaged camming beam or 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 B1935 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC B1935 was not retrieved, fault is intermittent. Go to step  4 .

  2. Check passenger-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 B1935 is retrieved, go to next step. If DTC B1935 is not retrieved, replace passenger-side air bag module. See RESTRAINTS CONTROL MODULE (RCM)  under REMOVAL & INSTALLATION. Go to step  5 .
    NOTE: By disconnecting RCM harness connector, circuits No. 607 (Light Green/Orange wire) and No. 616 (Pink/Black wire) are shorted together by shorting bar. Do not remove shorting bar.

  3. Check passenger-side air bag circuit

    Turn ignition switch to OFF position. Access RCM and disconnect harness connector. See RESTRAINTS CONTROL MODULE (RCM)  . Disconnect passenger-side air bag simulator. Zero ohmmeter. Measure resistance between Light Blue/Orange wire (circuit No. 607) and Pink/Black wire (circuit No. 616) on harness side of passenger-side air bag module harness connector. See WIRING DIAGRAMS  . If resistance is less than 10 k/ohms, repair low resistance in appropriate circuit as necessary. Go to step  5 . If resistance is more than 10 k/ohms, replace RCM. Go to step  5 .

  4. 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 Light Blue/Orange wire (circuit No. 607) and Pink/Black wire (circuit No. 616). 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.

  5. 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 (DTC) IDENTIFICATION  table. DO NOT clear any DTCs until all DTCs have been resolved. 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.
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