45 : LH Primary Crash Sensor Not Mounted Properly

DIAGNOSTIC TROUBLE CODE 45

LH Primary Crash Sensor Not Mounted to Vehicle Properly

Normal Operation
The air bag diagnostic monitor measures the resistance between Pin 21 (Circuit 620, P/LB) and Pin 3 (air bag 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, air bag diagnostic monitor will flash out code 45.

Note that Circuit 620 (P/LB) is riveted to the side of the LH 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 LH primary crash sensor 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 LH primary crash sensor.
3. An open circuit inside LH primary crash sensor.

Electrical Schematic - Diagnostic Trouble Code 44:

Pinpoint Tests 45-1 - 45-4: