Diagnostic Test

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE DTC TO RETURN
1. With the scan tool, read DTCs in all Heating Ventilation Air Conditioning Module (HVAC) and record on the repair order.
2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 10.0 seconds.
5. Turn the ignition on.
6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read DTCs.
Did the DTC return?

Yes
- Go To 2
No
- Perform the TESTING FOR AN INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
PERFORM THE APPROPRIATE HVAC ACTUATOR CALIBRATION / AUTO ADDRESSING ROUTINE TEST AND CHECK FOR THE DTC TO RETURN
NOTE:
NO HVAC mode or temp functions will perform as desired unless auto-addressing was successful.

NOTE:
Auto-addressing needs to be done every time the HVAC Module or an HVAC Actuator is replaced.

NOTE:
Diagnose and repair all LIN Bus related DTC's before performing this test procedure.

With the scan tool, perform the appropriate HVAC Actuator Calibration/Auto Addressing Routine and recheck DTCs.

Did any of the above test routines fail?

Yes
- Replace the faulty component that failed the HVAC Actuator Calibration/Auto Addressing Routine and or LIN issue in Accordance with the Service Information.
- Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
No
- Perform the TESTING FOR AN INTERMITTENT CONDITION procedure, if DTC is still present proceed to step 3. Refer to TESTING FOR AN INTERMITTENT CONDITION .
INSPECT THE DOOR, DUCTS, AND LINKAGE FOR CONDITIONS THAT COULD CAUSE BINDING
1. Inspect the door and linkage for conditions that could cause the door to not move freely across the total travel of the door.
2. Check for debris or objects in the ducts that could hinder the door movement.
3. Inspect the door stops for damage.
4. If necessary to gain access to the applicable door and ducts. Refer to HOUSING, HVAC, REMOVAL AND INSTALLATION .
  Were any problems found?
  
  Yes
  - Repair the binding condition as necessary.
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Go To 4
REPLACE THE 2ND ROW BLEND/TEMPERATURE DOOR 2 ACTUATOR AND CHECK FOR THE DTC TO RETURN
1. Replace the 2nd Row Blend/Temperature Door 2 Actuator in accordance with the Service Information. Refer to ACTUATOR, MODE DOOR, REAR, REMOVAL AND INSTALLATION .
2. Connect the Rear Mode Door Actuator, HVAC, and any other disconnected harness connectors.
3. Turn the ignition on.
4. With the scan tool, erase DTCs.
5. Using the Environmental Data and When Monitored conditions, operate the vehicle within the conditions that set the DTC.
6. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 5
  No
  - Replacing the 2nd Row Blend/Temperature Door 2 Actuator corrected the condition.
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all HVAC Module harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
5. Reconnect all HVAC Module harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read HVAC Module DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Heating Ventilation Air Conditioning Module (HVAC) in accordance with the service information. Refer to MODULE, HVAC, REMOVAL AND INSTALLATION .
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Test complete. The wiring or poor connection problem has been repaired.
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .