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Home >> Ford >> 1996 >> Aerostar Van Window >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Air Bag Restraint System >> Diagnostic Tests >> Code 24 - SAFING Sensor Diagnostic Circuit Open Or Low Resistance In Front Impact Sensor >> Test Procedure

Test Procedure

  1. Verify Condition

    Turn ignition on. Check for fault codes. If Code 24 is flashing, go to step 2). If Code 24 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 on. Measure voltage between terminals No. 3 (Black/White wire) and No. 13 (Black/Orange wire) of diagnostic monitor. See Figure . Record this voltage as system voltage.
  3. Using terminal No. 3 (Black/White wire)as ground, measure voltage between terminals No. 3 and terminals No. 11 (Gray/Orange wire) and No. 12 (Purple/White wire) of diagnostic monitor connector. Using these voltage readings and system voltage reading taken in step 2), determine if voltage at terminals No. 11 and 12 are within specification. See VOLTAGE SPECIFICATIONS (CODE 24)  table. If both voltage readings are within specification, check for an intermittent open circuit between fuse block and terminal No. 13. Repair as necessary. If wiring is okay, replace diagnostic monitor. If both voltage readings are low, go to step 4). If voltage reading at terminal No. 12 is high and voltage reading at terminal No. 11 is low, go to step 5).
    VOLTAGE SPECIFICATIONS (CODE 24)

    Voltage At Terminal No. 11 Or 12 System Voltage
    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

  4. Check Circuit Resistance

    Turn ignition off. Disconnect diagnostic monitor. Diagnostic monitor is located on left side of steering column under instrument panel. Disconnect negative battery cable. Using terminal No. 3 (Black/White wire) as ground, measure resistance between terminal No. 3 and terminals No. 17 (Pink/Orange wire) and No. 18 (Pink/White wire) at diagnostic monitor Gray connector. If resistance is 777-797 ohms at both terminals, go to step 7). If resistance is not 777-797 ohms at one or both terminals, go to step 6).

  5. Check For Short Circuit

    Disconnect safing sensor. Safing sensor is located behind right side kick panel. Check for continuity between circuits No. 614 (Gray/Orange wire) and No. 623 (Purple/White wire) of safing sensor connector. See Figure . If continuity exists, locate and repair short between circuits No. 614 and 623. If continuity does not exist, replace safing sensor.

  6. Check Sensor Resistance

    Disconnect appropriate front impact sensor that did not have a resistance reading of 777-797 ohms in step 4). Measure resistance between sensor terminals. If resistance is 777-797 ohms, locate and repair short to ground in wiring harness. If resistance is not 777-797 ohms, replace impact sensor.

  7. Check For Short Circuit

    Using terminal No. 3 (Black/White wire) as ground, check for continuity between terminals No. 3 and 11 (Gray/Orange wire) of diagnostic monitor. If continuity exists, locate and repair short to ground in circuit No. 614, 615, or 623. Also, check clockspring and safing sensor for internal shorts to ground. If continuity does not exist, replace diagnostic monitor.
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