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Home >> Ford >> 1996 >> Aerostar Van Window >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Air Bag Restraint System >> Diagnostic Tests >> Code 12 - Loss Of Battery Power To Air Bag Firing Circuit >> Test Procedure

Test Procedure

  1. Verify Condition

    Turn ignition on. Check for fault codes. If Code 12 is flashing, go to step 2). If Code 12 is not flashing, check connectors, wiring, splices, crimps, and charging circuit 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. Voltage Check

    Deactivate air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM  . Disconnect diagnostic monitor. Diagnostic monitor is located on left side of steering column under instrument panel. Turn ignition on. Measure voltage between terminals No. 13 (Yellow wire) and No. 3 (Black/White wire) of diagnostic monitor Gray connector. See Figure . If battery voltage is not present, go to step 3). If battery voltage is present, replace diagnostic monitor.

  3. Check Instrument Panel Fuse

    Check fuse No. 15 in instrument panel fuse block. On all models, if fuse is blown, go to step 4). If fuse is okay, locate and repair open circuit between fuse and terminal No. 13 and then go to step 6).

  4. Check For Short To Ground

    Replace fuse. If fuse does not blow again, go to step 5). If fuse blows again, locate and repair short to ground between fuse and terminal No. 13 of diagnostic monitor. After repair is completed, go to step 6).

  5. Check For Short To Ground In Circuits No. 611 & 612

    Turn ignition off. Reconnect diagnostic monitor. Turn ignition on. Recheck fuse No. 15. If fuse is blown, locate and repair short to ground in circuit No. 611 (White/Orange wire) or circuit No. 612 (Purple/Orange wire). If fuse is okay, short to ground is intermittent. Check all circuits between fuse and terminal No. 13 of diagnostic monitor. Also check circuits No. 611 and 612 for intermittent shorts. Repair as necessary and go to step 6).

  6. Verify System

    Replace fuse as necessary. Reconnect all air bag system connectors. When repairs are complete, check AIR BAG warning light for codes with Air Bag Simulator (105-00010) still in place of air bag module. If system checks okay, reactivate air bag system.
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