Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

DEFOG RELAY CONTROL CKT SHORTED TO BATT - DIAGNOSTIC PROCEDURE

TEST	ACTION
1	Turn the ignition on. With the DRBIII(R), record and erase DTCs. Depress the Rear Window Defogger Switch on the A/C Heater Control Module. With the DRBIII(R), read the active DTCs. Does the DRBIII(R) display DEFOG RELAY CONTROL CKT SHORTED TO BATT? Yes --> Go To 2 No --> Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Refer to Technical Service Bulletins that may apply. Perform BODY VERIFICATION TEST - VER 1 .
2	Turn the ignition off. Remove and install a known good relay in place of the Rear Window Defogger Relay. Turn the ignition on. With the DRBIII(R), record and erase DTCs. Depress the Rear Window Defogger Switch on the A/C Heater Control Module. With the DRBIII(R), read the active DTCs. Does the DRBIII(R) display DEFOG RELAY CONTROL CKT SHORTED TO BATT? Yes --> Go To 3 No --> Replace the Rear Window Defogger Relay in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 .
3	Turn the ignition off. Remove the Rear Window Defogger Relay from the Power Distribution Center. Disconnect the A/C Heater Control Module C1 harness connector. Measure the voltage on the Rear Window Defogger Relay Control circuit at the A/C Heater Control Module C1 with the Ignition off and on. Is there any voltage present? Yes --> Repair the Rear Window Defogger Relay Control circuit for a short to battery from the Rear Window Defogger Relay to the A/C Heater Control Module. Perform BODY VERIFICATION TEST - VER 1 . No --> Replace the A/C Heater Control Module in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 .