Test Notes

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/B) 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 ensure they are installed correctly.

NORMAL OPERATION
Diagnostic Trouble Code 73 refer to Diagnostic Trouble Code 33While 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 5 (Passenger Air Bag Feed) to Pin 4 (Passenger Air Bag Return) is between 0.9 ohm and 1.2 ohms. This resistance consists of the passenger air bag resistance (approximately 1.0 ohm) plus a small amount of resistance due to the wire itself, crimps, etc..

- If the resistance across Pin 5 and 4 exceeds 3 ohms, the air bag diagnostic monitor will store in memory and flash out on the air bag indicator a DTC 33.

- If the high resistance is later serviced or otherwise falls into the normal range, the next ignition switch cycle will produce a DTC 73 (or a higher priority DTC if one exists).

POSSIBLE CAUSES

Excessive Resistance Across Pins 2 and 3 Can Be Caused By:

- An open circuit or high resistance in the wiring harness in either Circuit 607 (LB/O) or 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.