Diagnostic Test

1) VERIFY THE DTC IS STILL ACTIVE
Turn the ignition on.

With the scan tool, erase HVAC DTCs.

Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait 10 minutes before proceeding.

With the scan tool, read HVAC DTCs.

Does the scan tool display this DTC?

Yes
1. Go to step 2).
No
1. The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
2. Perform BODY VERIFICATION TEST - VER 1 .
2) CHECK FOR NORMAL REAR DEFROST SWITCH AND STATUS INDICATOR FUNCTION
Set the Blower control to any position except Off.

Set the Mode control to any position except Auto.

Press the Rear Defrost switch on and off several times while observing the Rear Defrost status indicator.

Does the Rear Defrost status indicator turn on and off?

Yes
1. Go to step 4).
No
1. Go to step 3).
3) INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE REAR DEFROST SWITCH TO STAY OR STICK IN A PUSHED POSITION
Inspect the A/C Heater Control for anything that would cause the Rear Defrost switch to stay or stick in a pushed position.

Is anything present that would cause the Rear Defrost switch to stay or stick in a pushed position?

Yes
1. Repair as necessary.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go to step 4).
4) INSPECT THE A/C HEATER CONTROL FOR DAMAGE
Inspect the A/C Heater Control for damage.

Is the A/C Heater Control damaged?

Yes
1. Replace the A/C Heater Control in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Perform BODY VERIFICATION TEST - VER 1 .