Test Notes

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 a code 45.

NOTE: Circuit 620 (P/LB) is attached to the side of the center radiator crash sensor case. In addition, the case is grounded to the vehicle.

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 center radiator crash sensor mounting location.
2. An open or damaged Circuit 620 (P/LB) from Pin 21 of the diagnostic monitor harness connector to the center radiator crash sensor.
3. An open wire or loose Circuit 620 (P/LB) attachment inside center radiator crash sensor.