Test Notes

Fault Code 45-Center Radiator 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 attached to the side of the center radiator primary crash sensor case. In addition, the case is grounded to the vehicle.

Note that Circuit 620 (P/LB) is spliced into another wire going to pin 22 of the Diagnostic Monitor. Note also that Circuit 620 (P/LB) passes through an in-line connector between the main instrument panel harness and the engine compartment harness that connects to the center radiator primary crash sensor.

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 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 center radiator crash sensor. This includes splices and in-line connectors.
3. An open wire or loose Circuit 620 (P/LB) wire attachment inside center radiator crash sensor.