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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Air Bag Restraint Systems >> Diagnostic Tests >> Test M: Passenger Air Bag Resistance Low (DTC B1935) >> Possible Causes

Possible Causes

Passenger-side air bag low resistance could be caused by short in wiring harness or low resistance in air bag module.

  1. Check for hard or intermittent DTC

    Ensure ignition is off. Connect NGS tester to DLC. See USING NGS TESTER  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

    Turn ignition off. 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 PASSENGER-SIDE AIR BAG MODULE  under REMOVAL & INSTALLATION. Go to step  5 .
  3. Check passenger-side air bag circuit

    Turn ignition off. Disconnect passenger-side air bag simulator. Zero ohmmeter. Measure resistance between Green/White and Black/White wires on RCM side of passenger-side air bag module harness connector. If resistance is less than 10 k/ohms, repair low resistance in Green/White and/or Black/White wires as necessary. Go to step  5 . If resistance is more than 10 k/ohms, check wiring harness for corrosion. If wiring harness is damaged, repair/replace as necessary. Go to step  5 . If wiring harness is okay, 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 on Green/White wire and Black/White wire. 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. 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.