DTC B1934 - Low Resistance Or Short In Driver-Side Air Bag Circuit
WARNING: This page is about a different car, the 1996 Ford Ranger and 1996 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Before proceeding, see SERVICE PRECAUTIONS . After servicing has been performed, recheck AIR BAG warning light. If system is okay, install air bag modules and reactivate air bag system.
- Verify Condition
Connect NGS tester to DLC. Perform ON-DEMAND SELF-TEST. If DTC B1934 is retrieved, go to step 2). If DTC B1934 is not retrieved, go to step 5).NOTE: In the following step, it may be helpful to inspect clockspring-to-main wiring harness connector for an example of a normal shorting bar. - Check Circuit Resistance
Deactivate air bag system. See COMPLETE SYSTEM DEACTIVATION under DISABLING & ACTIVATING AIR BAG SYSTEM . 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, examine shorting bars on driver-side air bag connector. Replace driver-side air bag module if shorting bars are normal. Go to step 9).NOTE: In the following step, it may be helpful to inspect clockspring-to-main wiring harness connector for an example of a normal shorting bar. - Check For DTC B1934
Disconnect Air Bag Simulator from driver-side air bag connector. Disconnect diagnostic monitor. Set ohmmeter for highest scale (200K ohms or AUTO). Remove plastic locking wedge from Gray harness connector at air bag diagnostic monitor. Measure resistance between diagnostic monitor harness connector terminal C1-2 and C1-3 while turning steering wheel. If resistance is infinite or more, replace air bag diagnostic monitor if resistance is not infinite. Go to step 9). - Check For Harness Short
Disconnect clockspring from main wiring harness at base of steering column. Measure resistance between terminals C1-2 and C1-3 of diagnostic monitor connector. See Figure. If resistance is 1 MEG ohm or more, check shorting bar on clockspring connector for proper operation. If shorting bar is okay, replace clockspring. If resistance is not 1 MEG ohm or more, locate and repair short between circuits 614 (Gray/Orange wire) and 615 (Gray/White wire). Reconnect system. Verify system. Reactivate system. Go to step 9). - Check For DTC Service
Deactivate system. See COMPLETE SYSTEM DEACTIVATION under DISABLING & ACTIVATING AIR BAG SYSTEM . If DTC B1934 has just been repaired, go to step 9). If not, go to step 6). - Check Shorting Bars
Disconnect air bag diagnostic monitor. Set ohmmeter to lowest scale (200 ohms or AUTO). Zero ohmmeter by touching leads together and record resistance. Remove plastic locking wedge from Gray harness side connector. See Figure. Measure resistance between diagnostic monitor harness connector terminal C1-2 and C1-3 while wiggling wires at driver-side air bag connector where it mates to clockspring. Subtract reading found when zeroing ohmmeter. Inspect shorting bars in driver-side air bag module, clockspring connector at main wiring harness and air bag diagnostic monitor. Look for signs of poor operation of these shorting bars. If problems are noted or resistance reading is less than 1 ohm, repair problems and go to step 9). If resistance is more than one ohm, go to next step. - Check Clockspring
Remove air bag simulator from steering wheel. Measure resistance between diagnostic monitor harness connector terminals C1-2 and C1-3 while turning steering wheel. See Figure. If resistance is infinite, replace clockspring if resistance reading jumps while turning wheel. Go to step 9). If resistance reading is not infinite, go to next step. - Check Circuits 614 and 615
Inspect wiring and connections in circuits 614 (Gray/Orange wire) and 615 (Gray/White wire). Look for potential intermittent shorts between these circuits. Examine clockspring wires where clockspring mates to main harness. Examine clockspring contacts and driver-side air bag module wires where clockspring mates to driver-side air bag module. If problems are noted, repair problems. Replace clockspring or driver-side air bag module if clockspring or driver-side air bag module wires are damaged. Go to step 9). Re-examine fault code and look for causes of intermittent faults. Service any intermittent problems and go to 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.