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HOMESERVICE MANUALSJEEP2007GRAND CHEROKEE LIMITED, 3.0 M, 4WDREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSDTCS U0168 TO U0241, DTCS 11 TO 3224-REAR MODE DOOR RANGE TOO SMALL (MTC)DIAGNOSTIC TEST
2007 Jeep Grand Cherokee Limited, 3.0 M, 4WD

Diagnostic Test

2007 Jeep Grand Cherokee Limited, 3.0 M, 4WDSECTION Diagnostic Test
  1. 1) VERIFY IF ANY ACTUATOR CIRCUIT TEST FAULTS OR OVERCURRENT FAULTS ARE PRESENT 

    Turn the ignition on.

    Actuate the Clear DTC function by performing the following:

    • Turn the blower control on.
    • Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C mode switch.
    • When the A/C status indicator begins displaying DTCs, set the Mode switch to the floor position, simultaneously press the A/C mode switch and the EBL mode switch down until both LEDs start flashing (approximately 5 seconds) and then release the mode switches. Stored DTCs will clear from memory in approximately two seconds.

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

    Actuate the Actuator Circuit Test/Door Calibration Function by performing the following:

    • Turn the blower control off.
    • Press and hold the EBL mode switch down and then turn the blower control on. Continue to hold the EBL mode switch down until the EBL status indicator begins flashing. Then, release the EBL mode switch. While the test/function is running, the EBL status indicator will flash once per second. If the test/function passes, the EBL status indicator will stop flashing. If the test/function fails, the A/C and EBL status indicators will flash alternately. Allow the test/function to run to completion before proceeding.

    Actuate the Display DTC function by performing the following:

    • Turn the blower control on.
    • Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C mode switch.
    NOTE: The A/C status indicator displays active DTCs when the EBL status indicator is not illuminated and stored DTCs when the EBL status indicator is illuminated.

    Read DTCs from the A/C status indicator.

    Does the A/C status indicator display any of the following DTCs: 41, 42, 43, 44, 61, 62, 63, 64, 65, 66, 67, 68, 69, 71, or 72? 

    Yes 

    1. As present, diagnose and repair the faults in the following order: DTC 72 first, then DTC 62, then DTC 61, then DTCs 64, 66, 68, or 71, then DTCs 63, 65, 67, or 69, and finally DTCs 41, 42, 43, or 44. Refer to DIAGNOSTIC CODE INDEX .

    No 

    1. Go to step  2).
  2. 2) INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE REAR MODE DOOR TO BIND 

    Turn the ignition off.

    Inspect the actuator, linkage, and housing assembly for a condition causing the rear mode door to bind.

    Are there any physical or mechanical problems with the door, housing, linkage, or actuator? 

    Yes 

    1. Repair as necessary in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go to step  3).
  3. 3) CHECK REAR MODE DOOR TRAVEL 

    Remove the Rear Mode Door Actuator from the A/C Heater Housing Assembly.

    By hand, attempt to rotate the door in both directions. The door should operate smoothly in both directions over the entire span of travel (approximately 155 degrees).

    Does the door operate smoothly in both directions over the entire span of travel? 

    Yes 

    1. Replace the Rear Mode Door Actuator in accordance with the Service Information. Then, go to step  4).

    No 

    1. Repair as necessary in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  4. 4) VERIFY IF THE FAULT IS STILL PRESENT 

    Turn the ignition on.

    Actuate the Clear DTC function by performing the following:

    • Turn the blower control on.
    • Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C mode switch.
    • When the A/C status indicator begins displaying DTCs, set the Mode switch to the floor position, simultaneously press the A/C mode switch and the EBL mode switch down until both LEDs start flashing (approximately 5 seconds) and then release the mode switches. Stored DTCs will clear from memory in approximately two seconds.

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

    Actuate the Actuator Circuit Test/Door Calibration Function by performing the following:

    • Turn the blower control off.
    • Press and hold the EBL mode switch down and then turn the blower control on. Continue to hold the EBL mode switch down until the EBL status indicator begins flashing. Then, release the EBL mode switch. While the test/function is running, the EBL status indicator will flash once per second. If the test/function passes, the EBL status indicator will stop flashing. If the test/function fails, the A/C and EBL status indicators will flash alternately. Allow the test/function to run to completion before proceeding.

    Actuate the Display DTC function by performing the following:

    • Turn the blower control on.
    • Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C mode switch.
    NOTE: The A/C status indicator displays active DTCs when the EBL status indicator is not illuminated and stored DTCs when the EBL status indicator is illuminated.

    Read DTCs from the A/C status indicator.

    Does the A/C status indicator display DTC 24? 

    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 .
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.