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Home >> Ford >> 1997 >> Taurus G, AX4N >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Supplemental Inflatable Restraint System >> Diagnostic Tests >> DTC B1934 - Low Resistance Or Short In Driver-Side Air Bag Circuit >> Test Procedure

Test Procedure

  1. Verify Condition

    Connect NGS tester to DLC. Perform ON-DEMAND SELF-TEST  . If DTC B1934 is retrieved, go to next step. If DTC B1934 is not retrieved, go to step 5).

  2. Check Circuit Resistance

    Deactivate SRS. See DISABLING & ACTIVATING AIR BAG SYSTEM  . Connect NGS tester to DLC. Perform ON-DEMAND SELF-TEST  . If DTC B1932 is retrieved, go to next step. If DTC B1934 is not retrieved, go to step 9).

  3. Measure Resistance

    Disconnect Air Bag Simulator (105-R0010) from driver-side air bag connector. Disconnect air bag diagnostic monitor. Set ohmmeter to highest scale (200k/ohms or AUTO). Zero ohmmeter by touching leads together. Record resistance reading. Remove plastic locking wedge from Gray harness connector C276 at air bag diagnostic monitor. Measure resistance between diagnostic monitor harness connector terminal C276-2, circuit 614 (Gray/Orange wire) and C276-3, circuit 615 (Gray/White wire) while turning steering wheel. If resistance reading is less than 1 Mohm, go to next step. If resistance is not as specified, replace air bag diagnostic monitor. See DIAGNOSTIC MONITOR  under REMOVAL & INSTALLATION. Reconnect, verify, and reactivate system. See DISABLING & ACTIVATING AIR BAG SYSTEM  . Go to step 9).

  4. Check For Harness Short

    Disconnect clockspring connector at base of steering column. Measure resistance between diagnostic monitor harness connector terminal C276-2, circuit 614 (Gray/Orange wire) and C276-3, circuit 615 (Gray/White wire). If resistance reading is 1 Mohm or more, examine shorting bars for proper installation. Replace clockspring if shorting bars are normal. See CLOCKSPRING  under REMOVAL & INSTALLATION. Reconnect system. Go to step 9). If resistance is not as specified, service short between circuit 614 (Gray/Orange wire) and 615 (Gray/White wire). Reconnect, verify, and reactivate system. See DISABLING & ACTIVATING AIR BAG SYSTEM  . Go to step 9).

  5. Check For DTC Service

    Deactivate system. See DISABLING & ACTIVATING AIR BAG SYSTEM  . If DTC B1934 has just been repaired, go to step 9). If DTC B1934 has not just been repaired, go to next step.

  6. Check Shorting Bars

    Disconnect air bag diagnostic monitor. Set ohmmeter to lowest scale (200K ohms or AUTO). Zero ohmmeter by touching leads together and record reading. Remove plastic locking wedge from Gray harness side connector at base of steering column. Measure resistance between diagnostic monitor harness connector terminals C276-2, circuit 614 (Gray/Orange wire) and C276-3, circuit 615 (Gray/White wire) while wiggling wires at driver-side air bag module connector where it mates to clockspring. Subtract reading found when zeroing ohmmeter. Visually inspect shorting bars at driver-side air bag module, clockspring connector at main harness, and diagnostic monitor for signs of poor operation. If resistance is more than 1 ohm or no wiring problems present, go to next step. If resistance is more than 1 ohm or other problems present, service as necessary. Go to step 9).

  7. Check Clockspring

    Remove Air Bag Simulator (105-R0010) from steering wheel. Measure resistance between air bag diagnostic monitor harness connector terminal C276-2, circuit 614 (Gray/Orange wire) and C276-3, circuit 615 (Gray/White wire) while turning steering wheel. If resistance reading is not infinite (open), go to next step. If resistance is not as specified, replace clockspring if resistance reading jumps while turning steering wheel. See CLOCKSPRING  under REMOVAL & INSTALLATION. Go to step 9).

  8. Check Circuits 614 and 615

    Inspect circuit 614 (Gray/Yellow wire) and 615 (Gray/White wire), clockspring wires where it mates to main harness, and where clockspring mates to driver-side air bag module for potential intermittent shorts between circuits. If problems are noted, repair as necessary and replace clockspring and driver-side air bag if wiring is damaged. Go to next step. If no problems are noted, re-examine fault code and look for causes of intermittent high resistance or open in appropriate circuits. Attempt to recreate hard faults by driving vehicle, flexing wiring harnesses, etc. Repair intermittent problems and go to next step.

  9. Check For Other DTCs

    Connect NGS to DLC. If other DTCs are retrieved go to proper DTC test. If no other DTCs are retrieved, reactivate system and clear all DTCs. See DISABLING & ACTIVATING AIR BAG SYSTEM  .
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