B106B

B106B-REAR DEFROST CONTROL CIRCUIT LOW (ATC)





For a complete wiring diagram Refer to Diagrams/Electrical.

- When Monitored:

With ignition on.

- Set Condition:

If the EBL output is turned off and the (C115) Rear Window Defogger Relay Control circuit is either shorted to ground or open.





NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored. Refer to HVAC System Test (ATC) for stored DTC test procedures. HVAC System Test (ATC)

Diagnostic Test

1.INSTALL A SUBSTITUTE REAR WINDOW DEFOGGER RELAY & THEN CHECK FOR DTC B106B-REAR DEFROST CONTROL CIRCUIT LOW





Turn the ignition on.

Verify that the EBL mode switch is off.

Turn the ignition off.

Install a substitute Rear Window Defogger Relay.

Turn the ignition on.

With the scan tool, erase HVAC DTCs.

Turn the ignition off, wait 10 seconds, and turn the ignition on.

With the scan tool, read HVAC DTCs.

Does the scan tool display: B106B-REAR DEFROST CONTROL CIRCUIT LOW?

Yes

- Go To 2

No

- Replace the original Rear Window Defogger Relay.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

2.CHECK (C115) REAR WINDOW DEFOGGER RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND





Turn the ignition off.

Remove the substitute Rear Window Defogger Relay.

Disconnect the A/C Heater Control C1 harness connector.

Measure the resistance of the (C115) Rear Window Defogger Relay Control circuit between ground and the A/C Heater Control C1 harness connector.

Is the resistance below 10k ohms?

Yes

- Repair the (C115) Rear Window Defogger Relay Control circuit for a short to ground. Reinstall the original Rear Window Defogger Relay.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 3

3.CHECK (C115) REAR WINDOW DEFOGGER RELAY CONTROL CIRCUIT FOR AN OPEN





Measure the resistance of the (C115) Rear Window Defogger Relay Control circuit between the Rear Window Defogger Relay connector terminal 85 in the PDC and the A/C Heater Control C1 harness connector.

Is the resistance below 5.0 ohms?

Yes

- Replace the A/C Heater Control. Reinstall the original Rear Window Defogger Relay.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Repair the (C115) Rear Window Defogger Relay Control circuit for an open. Reinstall the original Rear Window Defogger Relay.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test