DTC 45: LH Primary Crash Sensor Not Mounted Properly

DIAGNOSTIC TROUBLE CODE 45

LH Radiator Primary Crash Sensor Not Mounted To Vehicle Properly

Normal Operation
The diagnostic monitor measures the resistance between Pin 21 (Circuit 620, P/LB) and Pin 3 (diagnostic monitor reference ground). If the 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 LH 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, dirt, or corrosion at the LH radiator primary crash sensor mounting location.
2. An open or damaged wire in Circuit 620 (P/LB) from Pin 21 of the diagnostic monitor harness connector to LH radiator primary crash sensor.
3. An open circuit inside LH radiator primary crash sensor.

Diagnostic Trouble Code 45 Electrical Schematic:

Pinpoint Tests 45-1 - 45-4: