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Home >> Jeep >> 2024 >> Wagoneer Carbide, RWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Rear Heating And Air Conditioning - DTCS B1052-12 To B108C-15 >> DTC Troubleshooting >> B1053-77 2ND Row Blend/Temperature Door 2 Control - Commanded Position Not Reachable >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    1. With the scan tool, read DTCs and record on the repair order.
    2. Record the Environmental Data.
    3. With the scan tool, erase DTCs.
    4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    5. With the scan tool, read HVAC Module DTCs.

      Did the DTC return?

      Yes 

      • Go To  3

      No 

      • Go To Next Step.
  2. PERFORM HVAC ACTUATOR CALIBRATION TEST AND RECHECK DTCS 
    1. With the scan tool, perform the HVAC Actuator Calibration Test and recheck DTCs.

      Did the DTC return?

      Yes 

      • Go To Next Step.

      No 

  3. CHECK THE DOOR DRIVER CIRCUITS FOR AN OPEN OR HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the Door Actuator harness connector that is associated with this DTC.
    3. Disconnect the HVAC Module C1 harness connector
    4. Measure the resistance of both Door Driver circuits between the HVAC Module C1 harness connector and the Door Actuator harness connector.

      Is the resistance below 3.0 Ohm for each measurement?

      Yes 

      • Go To Next Step.

      No 

      • Repair the circuit for an open or high resistance.
      • Perform the HVAC VERIFICATION TEST. Refer to: HVAC VERIFICATION TEST .
  4. CHECK THE DOOR DRIVER CIRCUITS FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the Door Actuator harness connector that is associated with this DTC.
    3. Disconnect the HVAC Module C1 harness connector
    4. Measure the resistance between ground and both Door Driver circuits at the HVAC Module C1 harness connector.

      Is there continuity between ground and either Door Driver circuit?

      Yes 

      • Repair the circuit for a short to ground.
      • Perform the HVAC VERIFICATION TEST. Refer to: HVAC VERIFICATION TEST .

      No 

      • Go to Next Step.
  5. CHECK THE DOOR DRIVER CIRCUITS FOR A SHORT TO ANOTHER CIRCUIT IN THE HVAC HARNESS 
    1. Turn the ignition off.
    2. Disconnect the Door Actuator harness connector that is associated with this DTC.
    3. Disconnect the HVAC Module C1 harness connector
    4. Using an ohmmeter, connect one lead to the first Door Driver circuit being tested at the HVAC Module harness connector.
    5. With the other lead probe all other circuits at the HVAC Module harness connector.
    6. Repeat this test with the second driver circuit.
      NOTE:

      When back-probing a circuit at a harness connector, always use an appropriate back probing tool to prevent damage to the connector terminals. 

      Is there continuity between the circuits being tested and any other circuit?

      Yes 

      • Repair the circuit for a short to another circuit. Use the wiring diagram as a guide to trace the circuits and look for any in-line connectors to help isolate the location of the short.
      • Perform the HVAC VERIFICATION TEST. Refer to: HVAC VERIFICATION TEST .

      No 

      • Go To Next Step.
  6. 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: HVAC HOUSING, 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 Next Step.
  7. CHECK THE DOOR ACTUATOR 
    1. Replace the associated Door Actuator in accordance with the Service Information.
    2. With the scan tool, erase DTCs and perform the HVAC Actuator Calibration Test.

      Did the DTC return?

      Yes 

      • Go To Next Step.

      No 

      • The new Door Actuator repaired the problem.
      • Perform the HVAC VERIFICATION TEST. Refer to: HVAC VERIFICATION TEST .
  8. 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 HVAC Module in accordance with the Service information.
      • Perform the HVAC VERIFICATION TEST. Refer to: HVAC VERIFICATION TEST .

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform the HVAC VERIFICATION TEST. Refer to: HVAC VERIFICATION TEST .
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