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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 105 (Supplemental Inflatable Restraint System) >> Diagnostic Tests >> Test K: Passenger-Side Air Bag Resistance Low (DTC B1935) >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2002 Ford Ranger. 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 in wiring harness, low resistance in passenger-side air bag module 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 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  5 .
    NOTE: Shorting bars may be accessed by prying out Blue cover from harness side of connector.
  2. Check RCM connector

    Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Access Restraints Control Module (RCM) and disconnect connector. See RESTRAINTS CONTROL MODULE (RCM)  under REMOVAL & INSTALLATION. Inspect RCM, component side of connector, for worn or damaged camming beam and/or any foreign material. See Figure . Inspect RCM connector for worn, damaged or dislodged shorting bars. If camming beams and shorting bars are okay, go to next step. If camming beams and shorting bars are defective, repair or replace as necessary and go to step  6 .
  3. Check passenger-side air bag

    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  6 .
    NOTE: By disconnecting RCM harness connector, circuits 607 (Light Blue/Orange wire) and 616 (Pink/Black wire) are shorted together by shorting bar. Do not remove shorting bar.
  4. Check passenger-side air bag circuit

    Turn ignition switch to OFF position. Disconnect air bag simulator from passenger-side air bag harness connector. Zero ohmmeter. Measure resistance between Light Blue/Orange and Pink/Black wires on harness side of passenger-side air bag module harness connector. If resistance is less than 10 k/ohms, repair low resistance in Light Blue/Orange and/or Pink/Black wires as necessary. See WIRING DIAGRAMS  . Go to step  6 . If resistance is more than 10 k/ohms, replace RCM. 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 Light Blue/Orange wire and Pink/Black wire. 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. Perform system operation check. See SYSTEM OPERATION CHECK  . Clear all DTCs. See CLEARING FAULT CODES  under DIAGNOSTICS.