Defog Relay Control CKT Shorted To BATT
DEFOG RELAY CONTROL CKT SHORTED TO BATT
For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams
- When Monitored:
With the ignition on and the EBL switch depressed.
- Set Condition:
This DTC will set when the A/C Heater Control Module senses excessive current draw on the Rear Window Defogger Relay Control circuit.
1. CHECK FOR HVAC DTCS
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Depress the EBL switch on the A/C Heater Control Module.
4. With the scan tool, read the active DTCs.
Does the scan tool 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 any Hotline letters or Technical Service Bulletins that may apply.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
2. REAR WINDOW DEFOGGER RELAY SHORTED TO BATTERY
1. Turn the ignition on.
2. With the scan tool, erase DTCs.
3. Turn the ignition off.
4. Remove and install a known good relay in place of the Rear Window Defogger Relay.
5. Turn the ignition on.
6. Depress the EBL Switch on the A/C Heater Control Module.
7. With the scan tool, read the active DTCs.
Does the scan tool display DEFOG RELAY CONTROL CKT SHORTED TO BATT?
Yes
- Go To 3
No
- Replace the Rear Window Defogger Relay.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
3. REAR WINDOW DEFOGGER RELAY CONTROL CIRCUIT SHORTED TO BATTERY
1. Turn the ignition off.
2. Remove the Rear Window Defogger Relay from the Power Distribution Center.
3. Disconnect the A/C Heater Control Module C2 harness connector.
4. Measure the voltage of the (C80) Rear Window Defogger Relay Control circuit at the A/C Heater Control Module connector with the Ignition off and on.
Is there any voltage present?
Yes
- Repair the (C80) Rear Window Defogger Relay Control circuit for a short to battery.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Replace the A/C Heater Control Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test.