Test Notes

RH Primary Crash Sensor Not Mounted to Vehicle Properly

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

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.

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, dirt or corrosion at the RH primary crash front air bag sensor and bracket mounting location.
2. An open or damaged wire in Circuit 620 (P/LB) from Pin 21 of the air bag diagnostic monitor harness connector to RH primary crash sensor.
3. An open circuit inside RH primary crash sensor.