Test Notes

NORMAL OPERATION
The air bag diagnostic monitor measures the resistance between Pin 21 (Circuit 620, P/LB) and Pin 3 (Circuit 57, BK, diagnostic monitor reference ground). If the air bag diagnostic monitor measures a difference of more than 2.0 ohms between Pin 21 and Pin 3, it will flash out code 45.

Note that Circuit 620 (P/LB) is grounded to the side of the center radiator primary crash sensor case and the case is grounded to the vehicle at its mounting point.


POSSIBLE CAUSES

High Resistance On Pin 21 (Circuit 620 P/LB) To Ground Can Be Caused By:

1. A poor connection due to loose mounting or dirt at the center radiator primary crash front air bag sensor and bracket mounting location.

2. An open or damaged wire (Circuit 620, P/LB) from Pin 21 of the air bag diagnostic monitor harness connector to center radiator primary crash sensor.

3. An open circuit inside center radiator primary crash sensor.