B106A

B106A-01-REAR DEFROST (EBL) CONTROL CIRCUIT GENERAL ELECTRICAL FAILURE

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
With the ignition on.

- Set Conditions:
This DTC will set when the HVAC Controller detects an open or short to ground on the Defogger Relay Control circuit.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. .

Diagnostic Test

1. CHECK IF DTC IS ACTIVE
1. Turn the Ignition on.
2. Using the HVAC controls, actuate the Rear Defogger Switch to the on and off positions.
3. With the scan tool, read DTCs.

Is this DTC active?

Yes
- Go To 2

No
- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

2. CHECK THE DEFOGGER RELAY CONTROL CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the A/C Heater Control Harness connector.
3. Remove the Rear Defrost relay from the rear PDC.
4. Measure the resistance of the Rear Defogger Relay Control circuit between the A/C Heater Control harness connector and the Rear Defrost Relay in the Rear PDC.

Is the resistance above 5.0 Ohms ?

Yes
- Repair the Defogger Relay Control circuit for an open.
- Perform the HVAC VERIFICATION TEST. .

No
- Go To 3

3. CHECK THE DEFOGGER RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the Rear Defogger Relay Control circuit at the A/C Heater Control Harness connector.

Is the resistance below 10k Ohms ?

Yes
- Repair the Defogger Relay Control circuit for a short to ground.
- Perform the HVAC VERIFICATION TEST. .

No
- Replace and program the A/C Heater Control.
- Perform the HVAC VERIFICATION TEST. .