DTC 45: Diagnostic Monitor Pin 21 Not Connected to GND

DIAGNOSTIC TROUBLE CODE 45

Diagnostic Monitor Pin 21 Not Connected To Ground

Normal Operation
The diagnostic monitor measures the resistance between Pin 21 (Circuit 618, P/LG) 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 Diagnostic Trouble Code 45.

Note that Circuit 618 (P/LG) is spliced to a wire which is attached to the RH radiator primary crash sensor case. In addition, the case is grounded to the vehicle. If the splice is open, Code 45 will flash.

Possible Causes
High resistance on Pin 21 (Circuit 618, P/LG) to ground can be caused by:
1. A poor connection due to loose mounting, dirt, or corrosion at the primary crash sensor mounting location.
2. A poor splice.
3. A poor connection at Pin 21 of the diagnostic monitor connector.

Diagnostic Trouble Code 45 Electrical Schematic:

Pinpoint Tests 45-1 - 45-2: