Test Notes

NORMAL OPERATION
The air bag diagnostic monitor measures the resistance between pin 21, circuit 9 (BR) and pin 3, circuit 91 (BK/R), diagnostic monitor reference ground. It the air bag diagnostic monitor measures a difference of more than 2.0 ohms between pin 21 and pin 3, it will flash code 45.

Note that circuit 9 (BR) is grounded to the side of the LH primary crash front air bag sensor case and the case is grounded to the vehicle at its mounting point.

POSSIBLE CAUSES
High resistance on pin 21, circuit 9 (BR) to ground can be caused by:

1. A poor connection due to loose mounting or dirt at the LH primary crash front air bag sensor and bracket mounting location.
2. An open or damaged wire circuit 9 (BR) from pin 21 of the air bag diagnostic monitor harness connector to LH primary crash front air bag sensor.
3. An open circuit inside LH primary crash front air bag sensor.