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Home >> Ford >> 1996 >> Aerostar Van Window >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Air Bag Restraint System >> Diagnostic Tests >> Code 41 - High Resistance Or Open In Front Impact Sensor Circuit >> Testing Procedure

Testing Procedure

  1. Verify Condition

    Turn ignition on. Check for fault codes. If Code 41 is flashing, go to step 2). If Code 41 is not flashing, check connectors, wiring, splices, and crimps for an intermittent problem. DO NOT proceed with diagnostic test unless code is flashing. Doing so will result in needless replacement of system components.
  2. Deactivate System

    Deactivate air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM  . Turn ignition switch off, then back to on. Measure and record system voltage between terminal No. 13 (Black/Orange wire) and No. 3 (Black/White wire) of diagnostic monitor gray connector. Measure between terminals No. 11 (Gray/Orange wire) and No. 3 (Black/White wire). Using VOLTAGE SPECIFICATIONS (CODE 41)  table, verify voltage at terminal No. 11 (Gray/Orange wire) is one volt of specification. If voltage reading is within specification, turn ignition switch off and go to step 3). If voltage reading is not within specification, go to step 4).
    VOLTAGE SPECIFICATIONS (CODE 41)

    Voltage At Terminals No. 10 and 11 System Voltage
    1.9 9.0
    2.0 9.5
    2.1 10.0
    2.2 10.5
    2.3 11.0
    2.4 11.5
    2.5 12.0
    2.6 12.5
    2.7 13.0
    2.8 13.5
    2.9 14.0
    3.0 14.5
    3.1 15.0
    3.2 15.5
  3. Check For Poor Connections

    Check appropriate impact sensor for poor connections. If poor connections are not present, replace diagnostic monitor. If worn, loose or damaged connections are present, repair as necessary.
  4. Measure Front Impact Sensor Resistance

    Turn ignition off. Disconnect diagnostic monitor. Using terminal No. 3 (Black/White wire) as a ground, measure resistance between terminals No. 3 (Black/White wire) and 17 (Pink/Orange wire) and No. 18 (Pink/White wire) of diagnostic monitor Gray connector. If both readings are 777-797 ohms, go to step 6). If one or both readings is not 777-797 ohms, go to step 5).
  5. Measure Resistance Of Suspect Sensor

    Locate and disconnect appropriate front impact sensor that did not have a resistance of 777-797 ohms in step 4). Measure resistance between terminals of suspect sensor. If resistance is 777-797 ohms, locate and repair open in wiring harness to sensor. If resistance is not 777-797 ohms, replace impact sensor.
  6. Check For Continuity Between Terminals No. 15 & 11

    Check for continuity between terminals No. 15 (White/Orange wire) and No. 11 (Gray/Orange wire) of diagnostic monitor connector. If continuity exists, go to step 7). If continuity does not exist, locate and repair short to voltage in circuit No. 614 (Gray/Orange wire) or No. 615 (Gray/White wire).
  7. Check Safing Sensor

    Disconnect safing sensor. Safing sensor is located behind right side kick panel. Check for continuity between Gray/Orange wire and White/Orange wire of safing sensor connector. See Figure . If continuity does not exist, locate and repair short between circuits No. 611 and 614. If continuity exists, replace safing sensor.