Diagnostic Test

WARNING: This page is about a different car, the 2009 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY THE DTC IS STILL ACTIVE
1. Turn the ignition on.
2. With the scan tool, erase HVAC DTCs.
3. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait 10 minutes before proceeding.
4. With the scan tool, read HVAC DTCs.
  Does the scan tool display this DTC?
  
  Yes
  - Go to step 2.
  No
  - 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.
  - Perform BODY VERIFICATION TEST - VER 1. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
CHECK FOR NORMAL REAR DEFROST SWITCH AND STATUS INDICATOR FUNCTION
1. Set the Blower control to any position except Off.
2. Set the Mode control to any position except Auto.
3. 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
  - Go to step 4.
  No
  - Go to step 3.
INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE REAR DEFROST SWITCH TO STAY OR STICK IN A PUSHED POSITION
1. 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
  - Repair as necessary.
  - Perform BODY VERIFICATION TEST - VER 1. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Go to step 4.
INSPECT THE A/C HEATER CONTROL FOR DAMAGE
1. Inspect the A/C Heater Control for damage.
  Is the A/C Heater Control damaged?
  
  Yes
  - Replace the A/C Heater Control in accordance with the service information.
  - Perform BODY VERIFICATION TEST - VER 1. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Perform BODY VERIFICATION TEST - VER 1. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .