Test Notes

NORMAL OPERATION

NOTE: The air bag connector and the air bag diagnostic monitor harness connector have metal spring clips that act as shorting bars These shorting bars are built into the plastic hard-shell connectors. The shorting bars are designed to short Circuit 607 (LB/O) and 616 (PK/BK) together when the connectors are not mated. DO NOT attempt to remove the air bag shorting bar and measure the resistance of the air bag.

The shorting bar(s) in the air bag diagnostic monitor harness connector may be removed by removing the black spacer (locking wedge) from the connector. Use extreme caution when reinstalling the spacers to make sure they are installed correctly.

While the ignition switch is in the RUN position, the air bag diagnostic monitor runs periodic checks on the resistance of the driver and passenger air bag circuits.
- Normal resistance from Pin C277-5, Circuit 607 (LB/O) (passenger air bag feed) to Pin C277-4, Circuit 616 (PK/BK) (passenger air bag return) is between 0.9 ohm and 1.2 ohms. This resistance consists of the passenger air bag module resistance (approximately 1.0 ohm) plus a small amount of resistance due to the wire itself, crimps, etc.
- If the resistance across Pin C277-5, Circuit 607(LB/O) and C277-4, Circuit 616(PK/BK) exceeds 3 ohms, the air bag diagnostic monitor will store in memory DTC B1933 and flash lamp fault code 33 on the AIR BAG indicator.
- If the high resistance is later serviced or otherwise falls into the normal range, DTC B1933 will be stored in memory.

POSSIBLE CAUSES
Excessive resistance across Pins C277-5, Circuit 607 (LB/O) and C277-4, Circuit 616 (PK/BK) can be caused by:
- an open circuit or high resistance in the wiring harness in either Pin C277-5, Circuit 607 (LB/O) or Pin C277-4, Circuit 616 (PK/BK).
- an open circuit or high resistance in the passenger side air bag module. Do not attempt a direct resistance measurement of the air bag. Follow the diagnostic procedure to determine if the air bag resistance is higher than normal.