HVAC Systems - Electrical Diagnostics: Diagnosis Dodge Charger V

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Test

1. 1) REPLACE THE A/C HEATER CONTROL Repair Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) REPLACE THE A/C HEATER CONTROL Repair Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) REPLACE THE A/C HEATER CONTROL Repair Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) REPLACE THE A/C HEATER CONTROL Repair Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display any of the following DTCs: 41, 43, 44, 61, 62, 63, 64, 67, 68, 69, 71, or 72? Yes As present, diagnose and repair the faults in the following order: DTC 72 first, then DTC 62, then DTC 61, then DTCs 64, 68, or 71, then DTCs 63, 67, or 69, and finally DTCs 41, 43, or 44. Refer to «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. No Go To step 2) .
2. 2) INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE LEFT BLEND DOOR TO BIND Turn the ignition off. Inspect the actuator, linkage, and housing assembly for a condition causing the left blend door to bind. Are there any physical or mechanical problems with the door, housing, linkage, or actuator? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK LEFT BLEND DOOR TRAVEL Remove the Left Blend 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 190 degrees). Does the door operate smoothly in both directions over the entire span of travel? Yes Replace the Left Blend Door Actuator in accordance with the Service Information. Then, Go To step 4) . No Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display DTC 18? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display any of the following DTCs: 41, 43, 44, 61, 62, 63, 64, 67, 68, 69, 71, or 72? Yes As present, diagnose and repair the faults in the following order: DTC 72 first, then DTC 62, then DTC 61, then DTCs 64, 68, or 71, then DTCs 63, 67, or 69, and finally DTCs 41, 43, or 44. Refer to «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. No Go To step 2) .
2. 2) CHECK FOR A BROKEN LEFT BLEND DOOR ACTUATOR Turn the ignition off. Remove the Left Blend Door Actuator from the A/C Heater Housing Assembly. By hand, attempt to rotate the actuator in both directions. Does the actuator turn in either direction? Yes Replace the Left Blend Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE LEFT BLEND DOOR & A/C HEATER HOUSING FOR WARPED, WORN, & DAMAGED COMPONENTS Inspect for excessively worn door linkage and for a damaged or broken A/C Heater Housing Assembly. Inspect for a warped or broken door, and missing door seals. Rotate the door from stop to stop. The door should rotate approximately 190 degrees. Are there any physical or mechanical problems with the door or housing? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Left Blend Door Actuator in accordance with the Service Information. Then, Go To step 4) .
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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display DTC 21? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display any of the following DTCs: 41, 43, 44, 61, 62, 63, 64, 67, 68, 69, 71, or 72? Yes As present, diagnose and repair the faults in the following order: DTC 72 first, then DTC 62, then DTC 61, then DTCs 64, 68, or 71, then DTCs 63, 67, or 69, and finally DTCs 41, 43, or 44. Refer to «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. No Go To step 2) .
2. 2) INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE MODE DOOR TO BIND Turn the ignition off. Inspect the actuator, linkage, and housing assembly for a condition causing the mode door to bind. Are there any physical or mechanical problems with the door, housing, linkage, or actuator? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK MODE DOOR TRAVEL Remove the 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 240 degrees). Does the door operate smoothly in both directions over the entire span of travel? Yes Replace the Mode Door Actuator in accordance with the Service Information. Then, Go To step 4) . No Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display DTC 22? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display any of the following DTCs: 41, 43, 44, 61, 62, 63, 64, 67, 68, 69, 71, or 72? Yes As present, diagnose and repair the faults in the following order: DTC 72 first, then DTC 62, then DTC 61, then DTCs 64, 68, or 71, then DTCs 63, 67, or 69, and finally DTCs 41, 43, or 44. Refer to «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. No Go To step 2) .
2. 2) CHECK FOR A BROKEN MODE DOOR ACTUATOR Turn the ignition off. Remove the Mode Door Actuator from the A/C Heater Housing Assembly. By hand, attempt to rotate the actuator in both directions. Does the actuator turn in either direction? Yes Replace the Mode Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE MODE DOOR & A/C HEATER HOUSING FOR WARPED, WORN, & DAMAGED COMPONENTS Inspect for excessively worn door linkage and for a damaged or broken A/C Heater Housing Assembly. Inspect for a warped or broken door, and missing door seals. Rotate the door from stop to stop. The door should rotate approximately 240 degrees. Are there any physical or mechanical problems with the door or housing? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Mode Door Actuator in accordance with the Service Information. Then, Go To step 4) .
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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display DTC 23? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

Scheme 1

1. 1) INSPECT THE A/C HEATER CONTROL FOR DAMAGE 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 ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 2) .
2. 2) INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE EBL MODE SWITCH TO STAY OR STICK IN A PUSHED POSITION Inspect the A/C Heater Control for anything that would cause the EBL mode switch to stay or stick in a pushed position. Is anything present that would cause the EBL mode switch to stay or stick in a pushed position? Yes Repair as necessary. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK FOR NORMAL EBL MODE SWITCH & STATUS INDICATOR FUNCTION Turn the ignition on. Press the EBL mode switch on and off several times while observing the EBL status indicator. Does the EBL status indicator turn on and off with respect to the switch position? Yes Go To step 4) . No Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
4. 4) CHECK A/C HEATER CONTROL OPERATION BY ATTEMPTING TO RUN THE ACTUATOR CALIBRATION FUNCTION If illuminated, turn off the A/C status indicator and the EBL status indicator. 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. Did the A/C Heater Control run the test / function? Yes Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) VERIFY THAT ALL OF THE COOLDOWN TEST PREREQUISITES WERE MET Review the list of Cooldown Test prerequisites. DTC 31 or 32 must not be active. The refrigerant system must be adequately charged. The blower motor must operate correctly in all speeds. The work area ambient temperature must be above 18.3°C (65°F). The evaporator temperature must be above 18.3°C (65°F). The A/C compressor must be turned off. Were all of the prerequisites met before running the Cooldown Test? Yes Go To step 2) . No Run the Cooldown Test again after all of the prerequisites are met. Then, if DTC 35 is still present, Go To step 2) . Otherwise, perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
2. 2) CHECK FOR DTCs IN THE PCM With the scan tool, select PCM. Are any DTCs present in the PCM? Yes Diagnose and repair the DTC(s). For all gas engines, «(Refer to ENGINE - DIAGNOSIS AND TESTING)»(ref-255953-S13528526332007060500000) . Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Refer to the «COOLDOWN TEST - ATC AND MTC SYSTEMS»(ref-255976-S40937002992007060500000) . Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) REPLACE THE A/C HEATER CONTROL Repair Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) REPLACE THE A/C HEATER CONTROL Repair Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

Scheme 2

1. 1) RUN THE ACTUATOR CIRCUIT TEST / DOOR CALIBRATION FUNCTION & THEN CHECK FOR ACTUATOR CIRCUIT TEST FAULTS NOTE: Diagnose and repair Actuator Circuit Test faults (DTC 61, 62, 63, 64, 67, 68, 69, 71, and 72) before diagnosing Overcurrent faults (DTC 41, 43, and 44). 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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display any of the following DTCs: 61, 62, 63, 64, 67, 68, 69, 71, or 72? Yes As present, diagnose and repair the Actuator Circuit Test faults in the following order: DTC 72 first, then DTC 62, then DTC 61, then DTCs 64, 68, or 71, and finally DTCs 63, 67, or 69. Refer to «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 2) .
2. 2) CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Turn the ignition off. Disconnect the A/C Heater Control C2 harness connector. Measure the resistance between the (C266) Mode Door Driver circuit and the (C255) Left Blend Door Driver circuit, (C55) Left Blend Door Common Driver circuit, (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C266) Mode Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE (C66) MODE DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C66) Mode Door Common Driver circuit and the (C255) Left Blend Door Driver circuit, (C55) Left Blend Door Common Driver circuit, (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C66) Mode Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 4) .
4. 4) CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C255) Left Blend Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 5) .
5. 5) CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C55) Left Blend Door Common Driver circuit and the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C55) Left Blend Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 6) .
6. 6) CHECK THE MODE DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C66) Mode Door Common Driver Circuit and the (C266) Mode Door Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 7) . No Go To step 8) .
7. 7) CHECK THE (C66) MODE DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C266) MODE DOOR DRIVER CIRCUIT Disconnect the Mode Door Actuator harness connector. Measure the resistance between the (C66) Mode Door Common Driver Circuit and the (C266) Mode Door Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C66) Mode Door Common Driver Circuit for a short to the (C266) Mode Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Mode Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
8. 8) CHECK THE LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C55) Left Blend Door Common Driver Circuit and the (C255) Left Blend Door Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 9) . No Go To step 10) .
9. 9) CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT Disconnect the Left Blend Door Actuator harness connector. Measure the resistance between the (C55) Left Blend Door Common Driver Circuit and the (C255) Left Blend Door Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C55) Left Blend Door Common Driver Circuit for a short to the (C255) Left Blend Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Left Blend Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
10. 10) CHECK THE RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C68) Recirculation Door Common Driver Circuit and the (C268) Recirculation Door Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 11) . No Go To step 12) .
11. 11) CHECK THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT Disconnect the Recirculation Door Actuator harness connector. Measure the resistance between the (C68) Recirculation Door Common Driver Circuit and the (C268) Recirculation Door Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C68) Recirculation Door Common Driver Circuit for a short to the (C268) Recirculation Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Recirculation Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
12. 12) VERIFY THAT THE FAULT IS STILL PRESENT Reconnect the A/C Heater Control C2 harness connector. Reconnect all of the door actuator harness connectors. 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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display DTC 43? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an intermittent short that set the original fault. Repair as necessary. Then, if present, diagnose and repair all other DTCs. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) RUN THE ACTUATOR CIRCUIT TEST / DOOR CALIBRATION FUNCTION & THEN CHECK FOR ACTUATOR CIRCUIT TEST FAULTS NOTE: Diagnose and repair Actuator Circuit Test faults (DTC 61, 62, 63, 64, 67, 68, 69, 71, and 72) before diagnosing Overcurrent faults (DTC 41, 43, and 44). 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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display any of the following DTCs: 61, 62, 63, 64, 67, 68, 69, 71, or 72? Yes As present, diagnose and repair the Actuator Circuit Test faults in the following order: DTC 72 first, then DTC 62, then DTC 61, then DTCs 64, 68, or 71, and finally DTCs 63, 67, or 69. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 2) .
2. 2) CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Turn the ignition off. Disconnect the A/C Heater Control C2 harness connector. Measure the resistance between the (C266) Mode Door Driver circuit and the (C255) Left Blend Door Driver circuit, (C55) Left Blend Door Common Driver circuit, (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C266) Mode Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE (C66) MODE DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C66) Mode Door Common Driver circuit and the (C255) Left Blend Door Driver circuit, (C55) Left Blend Door Common Driver circuit, (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C66) Mode Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 4) .
4. 4) CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C255) Left Blend Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 5) .
5. 5) CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C55) Left Blend Door Common Driver circuit and the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C55) Left Blend Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 6) .
6. 6) CHECK THE MODE DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C66) Mode Door Common Driver Circuit and the (C266) Mode Door Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 7) . No Go To step 8) .
7. 7) CHECK THE (C66) MODE DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C266) MODE DOOR DRIVER CIRCUIT Disconnect the Mode Door Actuator harness connector. Measure the resistance between the (C66) Mode Door Common Driver Circuit and the (C266) Mode Door Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C66) Mode Door Common Driver Circuit for a short to the (C266) Mode Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Mode Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
8. 8) CHECK THE LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C55) Left Blend Door Common Driver Circuit and the (C255) Left Blend Door Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 9) . No Go To step 10) .
9. 9) CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT Disconnect the Left Blend Door Actuator harness connector. Measure the resistance between the (C55) Left Blend Door Common Driver Circuit and the (C255) Left Blend Door Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C55) Left Blend Door Common Driver Circuit for a short to the (C255) Left Blend Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Left Blend Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
10. 10) CHECK THE RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C68) Recirculation Door Common Driver Circuit and the (C268) Recirculation Door Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 11) . No Go To step 12) .
11. 11) CHECK THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT Disconnect the Recirculation Door Actuator harness connector. Measure the resistance between the (C68) Recirculation Door Common Driver Circuit and the (C268) Recirculation Door Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C68) Recirculation Door Common Driver Circuit for a short to the (C268) Recirculation Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Recirculation Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
12. 12) VERIFY THAT THE FAULT IS STILL PRESENT Reconnect the A/C Heater Control C2 harness connector. Reconnect all of the door actuator harness connectors. 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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display DTC 44? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an intermittent short that set the original fault. Repair as necessary. Then, if present, diagnose and repair all other DTCs. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display any of the following DTCs: 41, 43, 44, 61, 62, 63, 64, 67, 68, 69, 71, or 72? Yes As present, diagnose and repair the faults in the following order: DTC 72 first, then DTC 62, then DTC 61, then DTCs 64, 68, or 71, then DTCs 63, 67, or 69, and finally DTCs 41, 43, or 44. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. No Go To step 2) .
2. 2) INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE RECIRCULATION DOOR TO BIND Turn the ignition off. Inspect the actuator, linkage, and housing assembly for a condition causing the recirculation door to bind. Are there any physical or mechanical problems with the door, housing, linkage, or actuator? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK RECIRCULATION DOOR TRAVEL Remove the Recirculation 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 100 degrees). Does the door operate smoothly in both directions over the entire span of travel? Yes Replace the Recirculation Door Actuator in accordance with the Service Information. Then, Go To step 4) . No Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display DTC 51? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display any of the following DTCs: 41, 43, 44, 61, 62, 63, 64, 67, 68, 69, 71, or 72? Yes As present, diagnose and repair the faults in the following order: DTC 72 first, then DTC 62, then DTC 61, then DTCs 64, 68, or 71, then DTCs 63, 67, or 69, and finally DTCs 41, 43, or 44. Refer to the T «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. No Go To step 2) .
2. 2) CHECK FOR A BROKEN RECIRCULATION DOOR ACTUATOR Turn the ignition off. Remove the Recirculation Door Actuator from the A/C Heater Housing Assembly. By hand, attempt to rotate the actuator in both directions. Does the actuator turn in either direction? Yes Replace the Recirculation Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE RECIRCULATION DOOR & A/C HEATER HOUSING FOR WARPED, WORN, & DAMAGED COMPONENTS Inspect for excessively worn door linkage and for a damaged or broken A/C Heater Housing Assembly. Inspect for a warped or broken door, and missing door seals. Rotate the door from stop to stop. The door should rotate approximately 100 degrees. Are there any physical or mechanical problems with the door or housing? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Recirculation Door Actuator in accordance with the Service Information. Then, Go To step 4) .
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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display DTC 52? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display any of the following DTCs: 41, 43, 44, 61, 62, 63, 64, 67, 68, 69, 71, or 72? Yes As present, diagnose and repair the faults in the following order: DTC 72 first, then DTC 62, then DTC 61, then DTCs 64, 68, or 71, then DTCs 63, 67, or 69, and finally DTCs 41, 43, or 44. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. No Go To step 2) .
2. 2) CHECK FOR A BROKEN MODE DOOR ACTUATOR Turn the ignition off. Remove the Mode Door Actuator from the A/C Heater Housing Assembly. By hand, attempt to rotate the actuator in both directions. Does the actuator turn in either direction? Yes Replace the Mode Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE MODE DOOR & A/C HEATER HOUSING FOR DISCONNECTED, MISSING, & BROKEN COMPONENTS Inspect for disconnected, missing, or broken door linkage. Inspect for a damaged or broken A/C Heater Housing Assembly and a broken door. Rotate the door from stop to stop. The door should rotate approximately 240 degrees. Are there any physical or mechanical problems with the door or housing? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Mode Door Actuator in accordance with the Service Information. Then, Go To step 4) .
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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display DTC 53? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display any of the following DTCs: 41, 43, 44, 61, 62, 63, 64, 67, 68, 69, 71, or 72? Yes As present, diagnose and repair the faults in the following order: DTC 72 first, then DTC 62, then DTC 61, then DTCs 64, 68, or 71, then DTCs 63, 67, or 69, and finally DTCs 41, 43, or 44. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. No Go To step 2) .
2. 2) CHECK FOR A BROKEN LEFT BLEND DOOR ACTUATOR Turn the ignition off. Remove the Left Blend Door Actuator from the A/C Heater Housing Assembly. By hand, attempt to rotate the actuator in both directions. Does the actuator turn in either direction? Yes Replace the Left Blend Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE LEFT BLEND DOOR & A/C HEATER HOUSING FOR DISCONNECTED, MISSING, & BROKEN COMPONENTS Inspect for disconnected, missing, or broken door linkage. Inspect for a damaged or broken A/C Heater Housing Assembly and a broken door. Rotate the door from stop to stop. The door should rotate approximately 190 degrees. Are there any physical or mechanical problems with the door or housing? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Left Blend Door Actuator in accordance with the Service Information. Then, Go To step 4) .
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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display DTC 55? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display any of the following DTCs: 41, 43, 44, 61, 62, 63, 64, 67, 68, 69, 71, or 72? Yes As present, diagnose and repair the faults in the following order: DTC 72 first, then DTC 62, then DTC 61, then DTCs 64, 68, or 71, then DTCs 63, 67, or 69, and finally DTCs 41, 43, or 44. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. No Go To step 2) .
2. 2) CHECK FOR A BROKEN RECIRCULATION DOOR ACTUATOR Turn the ignition off. Remove the Recirculation Door Actuator from the A/C Heater Housing Assembly. By hand, attempt to rotate the actuator in both directions. Does the actuator turn in either direction? Yes Replace the Recirculation Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE RECIRCULATION DOOR & A/C HEATER HOUSING FOR DISCONNECTED, MISSING, & BROKEN COMPONENTS Inspect for disconnected, missing, or broken door linkage. Inspect for a damaged or broken A/C Heater Housing Assembly and a broken door. Rotate the door from stop to stop. The door should rotate approximately 100 degrees. Are there any physical or mechanical problems with the door or housing? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Recirculation Door Actuator in accordance with the Service Information. Then, Go To step 4) .
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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display DTC 56? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

Refer to 73-AC REQUEST OUTPUT SIGNAL TOO HIGH (MTC) for the diagnostic test procedure.

Refer to 74-AC REQUEST OUTPUT SIGNAL TOO LOW (MTC) for the diagnostic test procedure.

Scheme 3

1. 1) CHECK THE BLOWER SPEED SETTING Was the blower control set to high speed before executing the Cooldown Test? Yes Go To step 2) . No Start the engine, set the blower control to high speed, and then run the Cooldown Test again. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
2. 2) CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR A SHORT TO THE (Z908) GROUND CIRCUIT Turn the ignition off. Disconnect the A/C Heater Control C3 harness connector. Measure the resistance between the (C850) Blower Switch Position Signal circuit and the (Z908) Ground circuit in the A/C Heater Control C3 harness connector. Is the resistance below 10K ohms? Yes Repair the (C850) Blower Switch Position Signal circuit for a short to the (Z908) Ground circuit. Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR A SHORT TO THE (Z909) GROUND CIRCUIT Disconnect the A/C Heater Control C1 harness connector. Measure the resistance between the (C850) Blower Switch Position Signal circuit and the (Z909) Ground circuit in the A/C Heater Control C1 harness connector. Is the resistance below 10K ohms? Yes Repair the (C850) Blower Switch Position Signal circuit for a short to the (Z909) Ground circuit. Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 4) .
4. 4) CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT VOLTAGE Reconnect the A/C Heater Control C1 harness connector. Turn the ignition on. Measure the voltage of the (C850) Blower Switch Position Signal circuit. Is the voltage above 4.8 volts? Yes Check the blower motor and related circuits for the cause of blower operation problems and repair as necessary. Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 5) .
5. 5) CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance of the (C850) Blower Switch Position Signal circuit between ground and the A/C Heater Control C3 harness connector. Is the resistance below 10K ohms? Yes Repair the (C850) Blower Switch Position Signal circuit for a short to ground. Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 6) .
6. 6) CHECK (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR AN OPEN Measure the resistance of the (C850) Blower Switch Position Signal circuit between the A/C Heater Control C1 harness connector and the A/C Heater Control C3 harness connector. Is the resistance below 5.0 ohms? Yes Replace the A/C Heater Control in accordance with the Service Information. Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) No Repair the (C850) Blower Switch Position Signal circuit for an open. Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

Refer to 31-EVAPORATOR SENSOR OPEN (MTC) for the diagnostic test procedure.

Refer to 32-EVAPORATOR SENSOR SHORTED (MTC) for the diagnostic test procedure.

1. 1) CHECK THE BLOWER SPEED SETTING Was the blower control set to high speed for the entire Cooldown Test? Yes Go To step 2) . No Start the engine, set the blower control to high speed, and then run the Cooldown Test again. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
2. 2) CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR A SHORT TO THE (Z908) GROUND CIRCUIT Turn the ignition off. Disconnect the A/C Heater Control C3 harness connector. Measure the resistance between the (C850) Blower Switch Position Signal circuit and the (Z908) Ground circuit in the A/C Heater Control C3 harness connector. Is the resistance below 10K ohms? Yes Repair the (C850) Blower Switch Position Signal circuit for a short to the (Z908) Ground circuit. Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR A SHORT TO THE (Z909) GROUND CIRCUIT Disconnect the A/C Heater Control C1 harness connector. Measure the resistance between the (C850) Blower Switch Position Signal circuit and the (Z909) Ground circuit in the A/C Heater Control C1 harness connector. Is the resistance below 10K ohms? Yes Repair the (C850) Blower Switch Position Signal circuit for a short to the (Z909) Ground circuit. Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 4) .
4. 4) CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT VOLTAGE Reconnect the A/C Heater Control C1 harness connector. Turn the ignition on. Measure the voltage of the (C850) Blower Switch Position Signal circuit. Is the voltage above 4.8 volts? Yes Check the blower motor and related circuits for the cause of blower operation problems and repair as necessary. Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 5) .
5. 5) CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance of the (C850) Blower Switch Position Signal circuit between ground and the A/C Heater Control C3 harness connector. Is the resistance below 10K ohms? Yes Repair the (C850) Blower Switch Position Signal circuit for a short to ground. Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 6) .
6. 6) CHECK (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR AN OPEN Measure the resistance of the (C850) Blower Switch Position Signal circuit between the A/C Heater Control C1 harness connector and the A/C Heater Control C3 harness connector. Is the resistance below 5.0 ohms? Yes Replace the A/C Heater Control in accordance with the Service Information. Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) No Repair the (C850) Blower Switch Position Signal circuit for an open. Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

Scheme 4

1. 1) CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE & CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE or XXXX CONTROL CIRCUIT OPEN DTCs? Yes Diagnose and repair the DTC(s). If present, diagnose and repair all Control Circuit/Performance DTCs before diagnosing Control Circuit Open DTCs. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No Go To step 2) .
2. 2) INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE RIGHT BLEND DOOR TO SEIZE OR BIND Turn the ignition off. Inspect the actuator, linkage, and housing assembly for a condition causing the right blend door to seize or bind. Are there any physical or mechanical problems with the door, housing, linkage, or actuator? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK RIGHT BLEND DOOR TRAVEL Remove the Right Blend 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 190 degrees). Does the door operate smoothly in both directions over the entire span of travel? Yes Replace the Right Blend Door Actuator in accordance with the Service Information. Then, Go To step 4) . No Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
4. 4) RUN THE ACTUATOR CALIBRATION TEST Turn the ignition on. With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs. Does the scan tool display: B10AD-RIGHT BLEND DOOR TRAVEL RANGE TOO SMALL? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE & CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE or XXXX CONTROL CIRCUIT OPEN DTCs? Yes Diagnose and repair the DTC(s). If present, diagnose and repair all Control Circuit/Performance DTCs before diagnosing Control Circuit Open DTCs. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No Go To step 2) .
2. 2) CHECK FOR A BROKEN RIGHT BLEND DOOR ACTUATOR Turn the ignition off. Remove the Right Blend Door Actuator from the A/C Heater Housing Assembly. By hand, attempt to rotate the actuator in both directions. Does the actuator turn in either direction? Yes Replace the Right Blend Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE RIGHT BLEND DOOR & A/C HEATER HOUSING FOR WARPED, WORN, DAMAGED, MISSING, & BROKEN COMPONENTS Inspect for excessively worn, disconnected, missing, or broken door linkage. Inspect for a damaged or broken A/C Heater Housing Assembly. Inspect for a warped or broken door, and missing door seals. Rotate the door from stop to stop. The door should rotate approximately 190 degrees. Are there any physical or mechanical problems with the door or housing? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Right Blend Door Actuator in accordance with the Service Information. Then, Go To step 4) .
4. 4) RUN THE ACTUATOR THE CALIBRATION TEST Turn the ignition on. With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs. Does the scan tool display: B10AE-RIGHT BLEND DOOR TRAVEL RANGE TOO LARGE? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE & CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE or XXXX CONTROL CIRCUIT OPEN DTCs? Yes Diagnose and repair the DTC(s). Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No Go To step 2) .
2. 2) RUN ACTUATOR CALIBRATION TEST With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes Diagnose and repair the DTC(s). Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No Go To step 3) .
3. 3) CHECK MODE, BLEND & RECIRCULATION DOOR OPERATION Start the engine. Set the blower to high speed. Verify that air flows from the correct vents while setting the Mode control to the Panel position, the Bi-level position, the Floor/Defrost position, and the Defrost position. Then, repeat in the opposite direction. Set the Mode control to the Panel position. Set the Driver Blend control to the full cold position. Set the Passenger Blend control the full cold position. Verify that the airflow air temperature changes while setting the Driver Blend control to the full hot position. Then, repeat in the opposite direction. Verify that the airflow air temperature changes while setting the Passenger Blend control to the full hot position. Then, repeat in the opposite direction. Set the Mode control to any position between Floor and Panel. Press the Recirc function on. Verify that the sound of the airflow gets louder as the recirculation door opens to bring in recirculated air. Press the Recirc function off. Verify that the sound of the airflow gets softer as the recirculation door closes to bring in fresh air. Does each door operate properly? Yes The condition causing the fault has cleared at this time. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Remove the door actuator of the affected door from the A/C Heater Housing Assembly. By hand, attempt to rotate the actuator in both directions. Inspect the A/C Heater Housing for damage, for disconnected, missing, or broken linkage, and for broken or binding doors. Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE & CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE or XXXX CONTROL CIRCUIT OPEN DTCs? Yes Diagnose and repair the DTC(s). If present, diagnose and repair all Control Circuit/Performance DTCs before diagnosing Control Circuit Open DTCs. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No Go To step 2) .
2. 2) INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE LEFT BLEND DOOR TO SEIZE OR BIND Turn the ignition off. Inspect the actuator, linkage, and housing assembly for a condition causing the left blend door to seize or bind. Are there any physical or mechanical problems with the door, housing, linkage, or actuator? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK LEFT BLEND DOOR TRAVEL Remove the Left Blend 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 190 degrees). Does the door operate smoothly in both directions over the entire span of travel? Yes Replace the Left Blend Door Actuator in accordance with the Service Information. Then, Go To step 4) . No Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
4. 4) RUN THE ACTUATOR CALIBRATION TEST Turn the ignition on. With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs. Does the scan tool display: B10A6-LEFT BLEND DOOR TRAVEL RANGE TOO SMALL? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE & CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE or XXXX CONTROL CIRCUIT OPEN DTCs? Yes Diagnose and repair the DTC(s). If present, diagnose and repair all Control Circuit/Performance DTCs before diagnosing Control Circuit Open DTCs. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No Go To step 2) .
2. 2) CHECK FOR A BROKEN LEFT BLEND DOOR ACTUATOR Turn the ignition off. Remove the Left Blend Door Actuator from the A/C Heater Housing Assembly. By hand, attempt to rotate the actuator in both directions. Does the actuator turn in either direction? Yes Replace the Left Blend Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE LEFT BLEND DOOR & A/C HEATER HOUSING FOR WARPED, WORN, DAMAGED, MISSING, & BROKEN COMPONENTS Inspect for excessively worn, disconnected, missing, or broken door linkage. Inspect for a damaged or broken A/C Heater Housing Assembly. Inspect for a warped or broken door, and missing door seals. Rotate the door from stop to stop. The door should rotate approximately 190 degrees. Are there any physical or mechanical problems with the door or housing? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Left Blend Door Actuator in accordance with the Service Information. Then, Go To step 4) .
4. 4) RUN THE ACTUATOR THE CALIBRATION TEST Turn the ignition on. With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs. Does the scan tool display: B10A7-LEFT BLEND DOOR TRAVEL RANGE TOO LARGE? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE & CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE or XXXX CONTROL CIRCUIT OPEN DTCs? Yes Diagnose and repair the DTC(s). Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No Go To step 2) .
2. 2) RUN ACTUATOR CALIBRATION TEST With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes Diagnose and repair the DTC(s). Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No Go To step 3) .
3. 3) CHECK MODE, BLEND & RECIRCULATION DOOR OPERATION Start the engine. Set the blower to high speed. Verify that air flows from the correct vents while setting the Mode control to the Panel position, the Bi-level position, the Floor/Defrost position, and the Defrost position. Then, repeat in the opposite direction. Set the Mode control to the Panel position. Set the Driver Blend control to the full cold position. Set the Passenger Blend control the full cold position. Verify that the airflow air temperature changes while setting the Driver Blend control to the full hot position. Then, repeat in the opposite direction. Verify that the airflow air temperature changes while setting the Passenger Blend control to the full hot position. Then, repeat in the opposite direction. Set the Mode control to any position between Floor and Panel. Press the Recirc function on. Verify that the sound of the airflow gets louder as the recirculation door opens to bring in recirculated air. Press the Recirc function off. Verify that the sound of the airflow gets softer as the recirculation door closes to bring in fresh air. Does each door operate properly? Yes The condition causing the fault has cleared at this time. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Remove the door actuator of the affected door from the A/C Heater Housing Assembly. By hand, attempt to rotate the actuator in both directions. Inspect the A/C Heater Housing for damage, for disconnected, missing, or broken linkage, and for broken or binding doors. Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) CHECK THE DOOR DRIVER CIRCUITS FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the A/C Heater Control C2 harness connector. Turn the ignition on. Measure the voltage of the (C266) Mode Door Driver circuit, the (C66) Mode Door Common Driver circuit, the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit. Is the voltage above 0.2 volts on any of the circuits? Yes Repair all circuits with voltage above 0.2 volts for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 2) .
2. 2) CHECK THE DOOR DRIVER CIRCUITS FOR A SHORT TO GROUND Turn the ignition off. Measure the resistance of the (C266) Mode Door Driver circuit, the (C66) Mode Door Common Driver circuit, the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit between ground and the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to ground. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C266) Mode Door Driver circuit and the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C266) Mode Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 4) .
4. 4) CHECK THE (C66) MODE DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C66) Mode Door Common Driver circuit and the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C66) Mode Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 5) .
5. 5) CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to (C255) Left Blend Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 6) .
6. 6) CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C55) Left Blend Door Common Driver circuit and the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to (C55) Left Blend Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 7) .
7. 7) CHECK THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C252) Right Blend Door Driver circuit and the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C252) Right Blend Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 8) .
8. 8) CHECK THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C52) Right Blend Door Common Driver circuit and the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C52) Right Blend Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 9) .
9. 9) CHECK THE MODE DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C266) Mode Door Driver circuit and the (C66) Mode Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 10) . No Go To step 11) .
10. 10) CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C66) MODE DOOR COMMON DRIVER CIRCUIT Disconnect the Mode Door Actuator harness connector. Measure the resistance between the (C266) Mode Door Driver circuit and the (C66) Mode Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C266) Mode Door Driver circuit for a short to the (C66) Mode Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Mode Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
11. 11) CHECK THE LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C55) Left Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 12) . No Go To step 13) .
12. 12) CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT Disconnect the Left Blend Door Actuator harness connector. Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C55) Left Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C255) Left Blend Door Driver circuit for a short to the (C55) Left Blend Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Left Blend Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
13. 13) CHECK THE RIGHT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C252) Right Blend Door Driver circuit and the (C52) Right Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 14) . No Go To step 15) .
14. 14) CHECK THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT Disconnect the Right Blend Door Actuator harness connector. Measure the resistance between the (C252) Right Blend Door Driver circuit and the (C52) Right Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C252) Right Blend Door Driver circuit for a short to the (C52) Right Blend Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Right Blend Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
15. 15) CHECK THE RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 16) . No Go To step 17) .
16. 16) CHECK THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Disconnect the Recirculation Door Actuator harness connector. Measure the resistance between the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C268) Recirculation Door Driver circuit for a short to the (C68) Recirculation Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Recirculation Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
17. 17) RUN THE ACTUATOR CALIBRATION TEST Reconnect the A/C Heater Control C2 harness connector. Reconnect the all of the Door Actuator harness connectors. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs. Does the scan tool only display: B10A9-RIGHT BLEND DOOR CONTROL CIRCUIT/PERFORMANCE? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No, Other DTC(s) Displayed Diagnose and repair the other DTC(s). Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No, And No Other DTCs Displayed Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an intermittent short. Repair as necessary. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) VERIFY THAT ALL OF THE COOLDOWN TEST PREREQUISITES WERE MET Review the list of Cooldown Test prerequisites. DTCs B1031 and B1032 must not be active. The refrigerant system must be adequately charged. The blower motor must operate correctly in all speeds. The work area ambient temperature must be above 18.3°C (65°F). The evaporator temperature must be above 18.3°C (65°F). The A/C compressor must be turned off. Were all of the prerequisites met before running the Cooldown Test? Yes Go To 2) . No Run the Cooldown Test again after all of the prerequisites are met. Then, if DTC B10B2 is still active, Go To 2) . Otherwise, Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
2. 2) CHECK FOR DTCs IN THE PCM With the scan tool, select PCM. Are any DTCs present in the PCM? Yes Diagnose and repair the DTC(s). For all gas engines, «(Refer to ENGINE - DIAGNOSIS AND TESTING)»(ref-255953-S13528526332007060500000) . Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Refer to the «COOLDOWN TEST - ATC AND MTC SYSTEMS»(ref-255976-S40937002992007060500000) for additional Cooldown Test related diagnostic information and testing procedures. Run the Cooldown Test again after the repair is complete. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

Scheme 5

1. 1) VERIFY THAT THE DTC IS ACTIVE WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING. NOTE: If the FCM detects and stores a DTC, the FCM also stores the environmental conditions under which the DTC was set. NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC. Turn the ignition on. With the scan tool, erase FCM DTCs. With the scan tool, actuate the PTC No. 1 Relay. Monitor the scan tool for at least two minutes. With the scan tool, read FCM DTCs. Is the status Active for this DTC? Yes Go To 2) . No Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
2. 2) CHECK (K342) FUSED ASD RELAY OUTPUT CIRCUIT FOR AN OPEN OR HIGH RESISTANCE Turn the ignition off. Remove the PTC No. 1 Relay. Turn the ignition on. Using a 12 volt test light connected to ground, check the (K342) Fused ASD Relay Output circuit in the PTC No. 1 Relay connector. NOTE: The test light should illuminate brightly. Compare the brightness to that of a direct connection to the battery. Does the test light illuminate brightly? Yes Go To 3) . No Repair the (K342) Fused ASD Relay Output circuit for an open or high resistance. Perform the BODY VERIFICATION TEST VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
3. 3) CHECK (K360) PTC NO. 1 RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the FCM from the Power Module. Measure the resistance between ground and the (K360) PTC No. 1 Relay Control circuit in the PTC No. 1 Relay connector. Is the resistance above 10.0 ohms? Yes Go To 4) . No Repair the (K360) PTC No. 1 Relay Control circuit for a short to ground. Perform the BODY VERIFICATION TEST VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
4. 4) CHECK (K360) PTC NO. 1 RELAY CONTROL CIRCUIT FOR AN OPEN OR HIGH RESISTANCE Measure the resistance of the (K360) PTC No. 1 Relay Control circuit between the PTC No. 1 Relay connector and the FCM connector. Is the resistance below 10.0 ohms? Yes Go To 5) . No Repair the (K360) PTC No. 1 Relay Control circuit for an open or high resistance. Perform the BODY VERIFICATION TEST VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
5. 5) CHECK PTC NO. 1 RELAY Install the FCM. Install a substitute PTC No. 1 Relay in place of the vehicle's PTC No. 1 Relay. Turn the ignition on. With the scan tool, erase FCM DTCs. With the scan tool, actuate the PTC No. 1 Relay. Monitor the scan tool for at least two minutes. With the scan tool, read FCM DTCs. Is the status Active for this DTC? Yes Go To 6) . No Replace the PTC No. 1 Relay in accordance with the Service Information. Perform the BODY VERIFICATION TEST VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
6. 6) INSPECT RELATED WIRING & CHECK FOR TSBs Turn the ignition off. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the PTC No. 1 Relay and the FCM. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the BODY VERIFICATION TEST VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the FCM in accordance with the Service Information. Perform the BODY VERIFICATION TEST VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) VERIFY THAT THE DTC IS ACTIVE WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING. NOTE: If the FCM detects and stores a DTC, the FCM also stores the environmental conditions under which the DTC was set. NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC. Turn the ignition on. With the scan tool, erase FCM DTCs. With the scan tool, actuate the PTC No. 2 Relay. Monitor the scan tool for at least two minutes. With the scan tool, read FCM DTCs. Is the status Active for this DTC? Yes Go To 2) . No Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
2. 2) CHECK (K342) FUSED ASD RELAY OUTPUT CIRCUIT FOR AN OPEN OR HIGH RESISTANCE Turn the ignition off. Remove the PTC No. 2 Relay. Turn the ignition on. Using a 12 volt test light connected to ground, check the (K342) Fused ASD Relay Output circuit in the PTC No. 2 Relay harness connector. NOTE: The test light should illuminate brightly. Compare the brightness to that of a direct connection to the battery. Does the test light illuminate brightly? Yes Go To 3) . No Repair the (K342) Fused ASD Relay Output circuit for an open or high resistance. Perform the BODY VERIFICATION TEST VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
3. 3) CHECK (K361) PTC NO. 2 RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the FCM from the Power Module. Measure the resistance between ground and the (K361) PTC No. 2 Relay Control circuit in the PTC No. 2 Relay connector. Is the resistance above 10.0 ohms? Yes Go To 4) . No Repair the (K361) PTC No. 2 Relay Control circuit for a short to ground. Perform the BODY VERIFICATION TEST VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
4. 4) CHECK (K361) PTC NO. 2 RELAY CONTROL CIRCUIT FOR AN OPEN OR HIGH RESISTANCE Measure the resistance of the (K361) PTC No. 2 Relay Control circuit between the PTC No. 2 Relay connector and the FCM connector. Is the resistance below 10.0 ohms? Yes Go To 5) . No Repair the (K361) PTC No. 2 Relay Control circuit for an open or high resistance. Perform the BODY VERIFICATION TEST VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
5. 5) CHECK PTC NO. 2 RELAY Install the FCM. Install a substitute PTC No. 2 Relay in place of the vehicle's PTC No. 2 Relay. Turn the ignition on. With the scan tool, erase FCM DTCs. With the scan tool, actuate the PTC No. 2 Relay. Monitor the scan tool for at least two minutes. With the scan tool, read FCM DTCs. Is the status Active for this DTC? Yes Go To 6) . No Replace the PTC No. 2 Relay in accordance with the Service Information. Perform the BODY VERIFICATION TEST VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
6. 6) INSPECT RELATED WIRING & CHECK FOR TSBs Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the PTC No. 2 Relay and the FCM. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the BODY VERIFICATION TEST VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the FCM in accordance with the Service Information. Perform the BODY VERIFICATION TEST VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) INSPECT THE A/C HEATER CONTROL FOR DAMAGE 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 ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 2) .
2. 2) INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE RECIRCULATION MODE SWITCH TO STAY OR STICK IN A PUSHED POSITION Inspect the A/C Heater Control for anything that would cause the Recirculation mode switch to stay or stick in a pushed position. Is anything present that would cause the Recirculation mode switch to stay or stick in a pushed position? Yes Repair as necessary. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK FOR NORMAL RECIRCULATION MODE SWITCH & STATUS INDICATOR FUNCTION Turn the ignition on. Set the Mode control to any position between Panel and Floor. Press the Recirculation mode switch on and off several times while observing the Recirculation status indicator. Does the Recirculation status indicator turn on and off? Yes Go To step 4) . No Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
4. 4) VERIFY THAT DTC B100A-RECIRCULATION SWITCH REQUEST INPUT CIRCUIT LOW IS STILL ACTIVE 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 active: B100A-RECIRCULATION SWITCH REQUEST INPUT CIRCUIT LOW? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE & CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE or XXXX CONTROL CIRCUIT OPEN DTCs? Yes Diagnose and repair the DTC(s). If present, diagnose and repair all Control Circuit/Performance DTCs before diagnosing Control Circuit Open DTCs. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No Go To step 2) .
2. 2) INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE RECIRCULATION DOOR TO SEIZE OR BIND Turn the ignition off. Inspect the actuator, linkage, and housing assembly for a condition causing the recirculation door to seize or bind. Are there any physical or mechanical problems with the door, housing, linkage, or actuator? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK RECIRCULATION DOOR TRAVEL Remove the Recirculation 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 100 degrees). Does the door operate smoothly in both directions over the entire span of travel? Yes Replace the Recirculation Door Actuator in accordance with the Service Information. Then, Go To step 4) . No Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
4. 4) RUN THE ACTUATOR CALIBRATION TEST Turn the ignition on. With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs. Does the scan tool display: B105C-RECIRCULATION DOOR TRAVEL RANGE TOO SMALL? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE & CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE or XXXX CONTROL CIRCUIT OPEN DTCs? Yes Diagnose and repair the DTC(s). If present, diagnose and repair all Control Circuit/Performance DTCs before diagnosing Control Circuit Open DTCs. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No Go To step 2) .
2. 2) CHECK FOR A BROKEN RECIRCULATION DOOR ACTUATOR Turn the ignition off. Remove the Recirculation Door Actuator from the A/C Heater Housing Assembly. By hand, attempt to rotate the actuator in both directions. Does the actuator turn in either direction? Yes Replace the Recirculation Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE RECIRCULATION DOOR & A/C HEATER HOUSING FOR WARPED, WORN, DAMAGED, MISSING, & BROKEN COMPONENTS Inspect for excessively worn, disconnected, missing, or broken door linkage. Inspect for a damaged or broken A/C Heater Housing Assembly. Inspect for a warped or broken door, and missing door seals. Rotate the door from stop to stop. The door should rotate approximately 100 degrees. Are there any physical or mechanical problems with the door or housing? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Recirculation Door Actuator in accordance with the Service Information. Then, Go To step 4) .
4. 4) RUN THE ACTUATOR CALIBRATION TEST Turn the ignition on. With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs. Does the scan tool display: B105D-RECIRCULATION DOOR TRAVEL RANGE TOO LARGE? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

Scheme 6

1. 1) INSPECT THE A/C HEATER CONTROL FOR DAMAGE 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 ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 2) .
2. 2) INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE A/C MODE SWITCH TO STAY OR STICK IN A PUSHED POSITION Inspect the A/C Heater Control for anything that would cause the A/C mode switch to stay or stick in a pushed position. Is anything present that would cause the A/C mode switch to stay or stick in a pushed position? Yes Repair as necessary. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK FOR NORMAL A/C MODE SWITCH & STATUS INDICATOR FUNCTION Turn the ignition on. Set the Blower control to any position except Off. Set the Mode control to any position except Auto. Press the A/C mode switch on and off several times while observing the A/C status indicator. Does the A/C status indicator turn on and off? Yes Go To step 4) . No Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
4. 4) VERIFY THAT DTC B1001-A/C SWITCH REQUEST INPUT CIRCUIT LOW IS STILL ACTIVE 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 active: B1001-A/C SWITCH REQUEST INPUT CIRCUIT LOW? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) INSPECT THE A/C HEATER CONTROL FOR DAMAGE 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 ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 2) .
2. 2) INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE EBL MODE SWITCH TO STAY OR STICK IN A PUSHED POSITION Inspect the A/C Heater Control for anything that would cause the EBL mode switch to stay or stick in a pushed position. Is anything present that would cause the EBL mode switch to stay or stick in a pushed position? Yes Repair as necessary. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK FOR NORMAL EBL MODE SWITCH & STATUS INDICATOR FUNCTION Turn the ignition on. Press the EBL mode switch on and off several times while observing the EBL status indicator. Does the EBL status indicator turn on and off? Yes Go To step 4) . No Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
4. 4) VERIFY THAT DTC B1016-REAR DEFROST SWITCH REQUEST INPUT CIRCUIT LOW IS STILL ACTIVE 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 active: B1016-REAR DEFROST SWITCH REQUEST INPUT CIRCUIT LOW? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

Scheme 7

1. 1) REPLACE THE A/C HEATER CONTROL Repair Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) REPLACE THE A/C HEATER CONTROL Repair Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) CHECK THE DOOR DRIVER CIRCUITS FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the A/C Heater Control C2 harness connector. Turn the ignition on. Measure the voltage of the (C266) Mode Door Driver circuit, the (C66) Mode Door Common Driver circuit, the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit. Is the voltage above 0.2 volts on any of the circuits? Yes Repair all circuits with voltage above 0.2 volts for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 2) .
2. 2) CHECK THE DOOR DRIVER CIRCUITS FOR A SHORT TO GROUND Turn the ignition off. Measure the resistance of the (C266) Mode Door Driver circuit, the (C66) Mode Door Common Driver circuit, the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit between ground and the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to ground. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C266) Mode Door Driver circuit and the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C266) Mode Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 4) .
4. 4) CHECK THE (C66) MODE DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C66) Mode Door Common Driver circuit and the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C66) Mode Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 5) .
5. 5) CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to (C255) Left Blend Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 6) .
6. 6) CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C55) Left Blend Door Common Driver circuit and the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to (C55) Left Blend Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 7) .
7. 7) CHECK THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C252) Right Blend Door Driver circuit and the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C252) Right Blend Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 8) .
8. 8) CHECK THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C52) Right Blend Door Common Driver circuit and the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C52) Right Blend Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 9) .
9. 9) CHECK THE MODE DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C266) Mode Door Driver circuit and the (C66) Mode Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 10) . No Go To step 11) .
10. 10) CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C66) MODE DOOR COMMON DRIVER CIRCUIT Disconnect the Mode Door Actuator harness connector. Measure the resistance between the (C266) Mode Door Driver circuit and the (C66) Mode Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C266) Mode Door Driver circuit for a short to the (C66) Mode Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Mode Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
11. 11) CHECK THE LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C55) Left Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 12) . No Go To step 13) .
12. 12) CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT Disconnect the Left Blend Door Actuator harness connector. Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C55) Left Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C255) Left Blend Door Driver circuit for a short to the (C55) Left Blend Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Left Blend Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
13. 13) CHECK THE RIGHT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C252) Right Blend Door Driver circuit and the (C52) Right Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 14) . No Go To step 15) .
14. 14) CHECK THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT Disconnect the Right Blend Door Actuator harness connector. Measure the resistance between the (C252) Right Blend Door Driver circuit and the (C52) Right Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C252) Right Blend Door Driver circuit for a short to the (C52) Right Blend Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Right Blend Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
15. 15) CHECK THE RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 16) . No Go To step 17) .
16. 16) CHECK THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Disconnect the Recirculation Door Actuator harness connector. Measure the resistance between the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C268) Recirculation Door Driver circuit for a short to the (C68) Recirculation Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Recirculation Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
17. 17) RUN THE ACTUATOR CALIBRATION TEST Reconnect the A/C Heater Control C2 harness connector. Reconnect the all of the Door Actuator harness connectors. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs. Does the scan tool only display: B1040-PANEL MODE DOOR 1 CONTROL CIRCUIT/PERFORMANCE? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No, Other DTC(s) Displayed Diagnose and repair the other DTC(s). Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No, And No Other DTCs Displayed Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an intermittent short. Repair as necessary. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE & CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE or XXXX CONTROL CIRCUIT OPEN DTCs? Yes Diagnose and repair the DTC(s). If present, diagnose and repair all Control Circuit/Performance DTCs before diagnosing Control Circuit Open DTCs. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No Go To step 2) .
2. 2) INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE MODE DOOR TO SEIZE OR BIND Turn the ignition off. Inspect the actuator, linkage, and housing assembly for a condition causing the mode door to seize or bind. Are there any physical or mechanical problems with the door, housing, linkage, or actuator? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK MODE DOOR TRAVEL Remove the 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 240 degrees). Does the door operate smoothly in both directions over the entire span of travel? Yes Replace the Mode Door Actuator in accordance with the Service Information. Then, Go To step 4) . No Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
4. 4) RUN THE ACTUATOR CALIBRATION TEST Turn the ignition on. With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs. Does the scan tool display: B1044-PANEL MODE DOOR 1 TRAVEL RANGE TOO SMALL? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE & CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE or XXXX CONTROL CIRCUIT OPEN DTCs? Yes Diagnose and repair the DTC(s). If present, diagnose and repair all Control Circuit/Performance DTCs before diagnosing Control Circuit Open DTCs. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No Go To step 2) .
2. 2) CHECK FOR A BROKEN MODE DOOR ACTUATOR Turn the ignition off. Remove the Mode Door Actuator from the A/C Heater Housing Assembly. By hand, attempt to rotate the actuator in both directions. Does the actuator turn in either direction? Yes Replace the Mode Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE MODE DOOR & A/C HEATER HOUSING FOR WARPED, WORN, DAMAGED, MISSING, & BROKEN COMPONENTS Inspect for excessively worn, disconnected, missing, or broken door linkage. Inspect for a damaged or broken A/C Heater Housing Assembly. Inspect for a warped or broken door, and missing door seals. Rotate the door from stop to stop. The door should rotate approximately 240 degrees. Are there any physical or mechanical problems with the door or housing? Yes Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Mode Door Actuator in accordance with the Service Information. Then, Go To step 4) .
4. 4) RUN THE ACTUATOR THE CALIBRATION TEST Turn the ignition on. With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs. Does the scan tool display: B1045-PANEL MODE DOOR 1 TRAVEL RANGE TOO LARGE? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) CHECK THE DOOR DRIVER CIRCUITS FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the A/C Heater Control C2 harness connector. Turn the ignition on. Measure the voltage of the (C266) Mode Door Driver circuit, the (C66) Mode Door Common Driver circuit, the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit. Is the voltage above 0.2 volts on any of the circuits? Yes Repair all circuits with voltage above 0.2 volts for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 2) .
2. 2) CHECK THE DOOR DRIVER CIRCUITS FOR A SHORT TO GROUND Turn the ignition off. Measure the resistance of the (C266) Mode Door Driver circuit, the (C66) Mode Door Common Driver circuit, the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit between ground and the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to ground. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C266) Mode Door Driver circuit and the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C266) Mode Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 4) .
4. 4) CHECK THE (C66) MODE DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C66) Mode Door Common Driver circuit and the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C66) Mode Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 5) .
5. 5) CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to (C255) Left Blend Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 6) .
6. 6) CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C55) Left Blend Door Common Driver circuit and the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to (C55) Left Blend Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 7) .
7. 7) CHECK THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C252) Right Blend Door Driver circuit and the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C252) Right Blend Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 8) .
8. 8) CHECK THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Measure the resistance between the (C52) Right Blend Door Common Driver circuit and the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit. Is the resistance below 10k ohms on any of the circuits? Yes Repair all circuits with a resistance below 10k ohms for a short to the (C52) Right Blend Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 9) .
9. 9) CHECK THE MODE DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C266) Mode Door Driver circuit and the (C66) Mode Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 10) . No Go To step 11) .
10. 10) CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C66) MODE DOOR COMMON DRIVER CIRCUIT Disconnect the Mode Door Actuator harness connector. Measure the resistance between the (C266) Mode Door Driver circuit and the (C66) Mode Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C266) Mode Door Driver circuit for a short to the (C66) Mode Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Mode Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
11. 11) CHECK THE LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C55) Left Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 12) . No Go To step 13) .
12. 12) CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT Disconnect the Left Blend Door Actuator harness connector. Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C55) Left Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C255) Left Blend Door Driver circuit for a short to the (C55) Left Blend Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Left Blend Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
13. 13) CHECK THE RIGHT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C252) Right Blend Door Driver circuit and the (C52) Right Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 14) . No Go To step 15) .
14. 14) CHECK THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT Disconnect the Right Blend Door Actuator harness connector. Measure the resistance between the (C252) Right Blend Door Driver circuit and the (C52) Right Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C252) Right Blend Door Driver circuit for a short to the (C52) Right Blend Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Right Blend Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
15. 15) CHECK THE RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE Measure the resistance between the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 30.0 ohms? Yes Go To step 16) . No Go To step 17) .
16. 16) CHECK THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT Disconnect the Recirculation Door Actuator harness connector. Measure the resistance between the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector. Is the resistance below 10k ohms? Yes Repair the (C268) Recirculation Door Driver circuit for a short to the (C68) Recirculation Door Common Driver circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the Recirculation Door Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
17. 17) RUN THE ACTUATOR CALIBRATION TEST Reconnect the A/C Heater Control C2 harness connector. Reconnect the all of the Door Actuator harness connectors. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs. Does the scan tool only display: B1058-RECIRCULATION DOOR CONTROL CIRCUIT/PERFORMANCE? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No, Other DTC(s) Displayed Diagnose and repair the other DTC(s). Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No, And No Other DTCs Displayed Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an intermittent short. Repair as necessary. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

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1. 1) INSPECT THE A/C HEATER CONTROL FOR DAMAGE Turn the ignition off. 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 ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 2) .
2. 2) INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE A/C MODE SWITCH OR EBL MODE SWITCH TO STAY OR STICK IN A PUSHED POSITION Inspect the A/C Heater Control for anything that would cause the A/C mode switch or the EBL mode switch to stay or stick in a pushed position. Is anything present that would cause the A/C mode switch or EBL mode switch to stay or stick in a pushed position? Yes Repair as necessary. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 3) .
3. 3) CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT VOLTAGE Disconnect the A/C Heater Control C3 harness connector. Turn the ignition on. Measure the voltage of the (C850) Blower Switch Position Signal circuit. What is the voltage? Below 4.8 Volts Go To step 4) . Above 5.2 Volts Go To step 8) . 4.8 Volts To 5.2 Volts Go To step 9) .
4. 4) CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR A SHORT TO THE (Z908) GROUND CIRCUIT Turn the ignition off. Measure the resistance between the (C850) Blower Switch Position Signal circuit and the (Z908) Ground circuit in the A/C Heater Control C3 harness connector. Is the resistance below 10K ohms? Yes Repair the (C850) Blower Switch Position Signal circuit for a short to the (Z908) Ground circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 5) .
5. 5) CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR A SHORT TO THE (Z909) GROUND CIRCUIT Disconnect the A/C Heater Control C1 harness connector. Measure the resistance between the (C850) Blower Switch Position Signal circuit and the (Z909) Ground circuit in the A/C Heater Control C1 harness connector. Is the resistance below 10K ohms? Yes Repair the (C850) Blower Switch Position Signal circuit for a short to the (Z909) Ground circuit. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 6) .
6. 6) CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance of the (C850) Blower Switch Position Signal circuit between ground and the A/C Heater Control C3 harness connector. Is the resistance below 10K ohms? Yes Repair the (C850) Blower Switch Position Signal circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Go To step 7) .
7. 7) CHECK (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR AN OPEN Measure the resistance of the (C850) Blower Switch Position Signal circuit between the A/C Heater Control C1 harness connector and the A/C Heater Control C3 harness connector. Is the resistance below 5.0 ohms? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Repair the (C850) Blower Switch Position Signal circuit for an open. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
8. 8) CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the A/C Heater Control C1 harness connector. Turn the ignition on. Measure the voltage of the (C850) Blower Switch Position Signal circuit at the A/C Heater Control C3 harness connector. Is the voltage above 0.2 volts? Yes Repair the (C850) Blower Switch Position Signal circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
9. 9) CHECK FOR NORMAL A/C MODE SWITCH & STATUS INDICATOR FUNCTION Turn the ignition off. Reconnect the A/C Heater Control C3 harness connector. Turn the ignition on. Turn the blower control on. Press the A/C mode switch on and off several times while observing the A/C status indicator. Does the A/C status indicator turn on and off with respect to the switch position? Yes Go To step 10) . No Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
10. 10) CHECK FOR NORMAL EBL MODE SWITCH & STATUS INDICATOR FUNCTION Turn the blower control off. Press the EBL mode switch on and off several times while observing the EBL status indicator. Does the EBL status indicator turn on and off with respect to the switch position? Yes Go To step 11) . No Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
11. 11) CHECK THE A/C HEATER CONTROL BY ATTEMPTING TO ENTER DIAGNOSTIC MODE If illuminated, turn off the A/C status indicator and the EBL status indicator. 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. When entry mode is recognized, the A/C status indicator and the EBL status indicator will illuminate for 5 seconds and then, if present, will begin displaying DTCs. The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. However, if no DTCs are present, both status indicators will turn off and the system will exit diagnostic mode. Did the A/C Heater Control enter diagnostic mode? Yes Go To step 12) . No Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
12. 12) CHECK THE A/C HEATER CONTROL BY ATTEMPTING TO RUN THE ACTUATOR CIRCUIT TEST/ DOOR CALIBRATION FUNCTION Turn the ignition off, wait 10 seconds, then turn the ignition on. If illuminated, turn off the A/C status indicator and the EBL status indicator. 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. Did the A/C Heater Control run the test / function? Yes Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) . No Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) HVAC SYSTEM TEST NOTE: Diagnose and repair all active DTCs before diagnosing and repairing stored DTCs. Make a selection based on the symptom, condition, or DTC that you want to diagnose. For Any Active DTC Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. Scan Tool Indicates HVAC Not Active On Bus «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING)»(ref-255952-S37788235782007060500000) Complete HVAC System Test Go To step 2) . A/C System Performance Test Go To step 2) . General System Operation & Function Test Go To step 3) . Actuator Calibration Test Go To step 4) .
2. 2) A/C SYSTEM PERFORMANCE TEST NOTE: The following are prerequisites of the Cooldown Test. Verify each of the following before running the test: If active, diagnose and repair DTC B1031 or B1032 before proceeding. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. Verify that the refrigerant system has an adequate charge. Check and repair as necessary before proceeding. «(Refer to HEATING & AIR CONDITIONING/PLUMBING - DIAGNOSIS AND TESTING)»(ref-255976-S20782679602007060500000) . Verify that the blower motor operates correctly in all speeds. Diagnose and repair all blower related faults before proceeding. Verify that the work area ambient temperature is above 18.3°C (65°F) before proceeding. Move the vehicle to a warmer work area if necessary. Verify that the evaporator temperature is above 18.3°C (65°F) before proceeding. Verify that the A/C compressor is not running. If the A/C compressor is running, turn the A/C off and allow the evaporator to warm up before proceeding. Once all of the prerequisites have been met, actuate the Cooldown Test by performing the following: Start the engine. With the scan tool in HVAC, select System Tests and then select Cooldown test. NOTE: The Cooldown Test can take up to two minutes to run. While the test is running, the A/C status indicator will flash. If the test passes, the A/C status indicator will stop flashing. However, if the test fails, both the A/C and EBL status indicators will flash alternately and an active DTC B10B2 will set. The status indicators will continue to flash until either a successful Cooldown Test is executed or until the vehicle is driven a specified number of miles or after 5 ignition cycles. In addition, DTC B10B2 will remain active until a successful Cooldown Test is executed. The test will stop running if any of the following occurs: The ignition is turned off. The A/C compressor is requested off. DTC B1031 or B1032 sets during the test. Allow the test to run to completion before proceeding. With the scan tool, select View DTCs. Does the scan tool display any DTCs? Yes Diagnose and Repair the DTC(s). Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. Run the Cooldown Test again after the repair is complete. No As necessary, either Go To step 3) , or step 4) , or Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
3. 3) GENERAL SYSTEM OPERATION & FUNCTION TEST NOTE: If at anytime a DTC becomes active during this test, proceed to the conclusion question. NOTE: If multiple DTCs become active, diagnose those that relate to a short circuit first. If not done so previously, start the engine. Turn the blower control to manual low. Turn the Left and Right Blend controls to full cold. Turn the Mode control to panel. Monitor the scan tool for active HVAC DTCs while performing the following test steps. Press the A/C mode switch on, wait 30 seconds, press it off, and then proceed to the next step. Press the Rear Defrost mode switch on, wait 30 seconds, press it off, and then proceed to the next step. Press the Recirculation mode switch on, wait 30 seconds, press it off, and then proceed to the next step. Turn the Left Blend control to full hot, wait 30 seconds, turn it to full cold, and then proceed to the next step. Turn the Right Blend control to full hot, wait 30 seconds, turn it to full cold, and then proceed to the next step. Turn the Mode control to every door position. Leave it in each position for 30 seconds. Does the scan tool display any active DTCs? Yes Diagnose and repair the DTC(s). Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. No If you are here due to a stored DTC, it is possible that a technician may not have erased the DTC following a repair. If possible, verify if the vehicle was recently in for this type of service. Otherwise, either Go To step 4) . or visually inspect the related wiring harness for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals, and repair as necessary. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
4. 4) ACTUATOR CALIBRATION TEST If not done so previously, start the engine. With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes Diagnose and repair the DTC(s). Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No No problem found. However, if you are here due to a stored DTC, it is possible that a technician may not have erased the DTC following a repair. If possible, verify if the vehicle was recently in for this type of service. Otherwise, visually inspect the related wiring harness for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals, and repair as necessary. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .

1. 1) HVAC SYSTEM TEST NOTE: Diagnose and repair all active DTCs before diagnosing and repairing stored DTCs. Make a selection based on the symptom, condition, or DTC that you want to diagnose. For Any Active DTC Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. Complete HVAC System Test Go To step 2) . A/C System Performance Test Go To step 2) . General System Operation & Function Test Go To step 3) . Actuator CKT Test / Door Cal Function Go To step 4) . Control Won't Display Active / Stored DTCs Refer to *A/C Heater Control Will Not Enter Diagnostic Mode for the diagnostic test procedure. Control Won't Run System Tests Refer to *A/C Heater Control Will Not Enter Diagnostic Mode for the diagnostic test procedure.
2. 2) A/C SYSTEM PERFORMANCE TEST NOTE: The following are prerequisites of the Cooldown Test. Verify each of the following before running the test: If active, diagnose and repair DTC 31 or 32 before proceeding. Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. Verify that the refrigerant system has an adequate charge. Check and repair as necessary before proceeding «(Refer to HEATING & AIR CONDITIONING/PLUMBING - DIAGNOSIS AND TESTING)»(ref-255976-S20782679602007060500000) . Verify that the blower motor operates correctly in all speeds. Diagnose and repair all blower related faults before proceeding. Verify that the work area ambient temperature is above 18.3°C (65°F) before proceeding. Move the vehicle to a warmer work area if necessary. Verify that the evaporator temperature is above 18.3°C (65°F) before proceeding. Verify that the A/C compressor is not running. If the compressor is running, turn the A/C off and allow the evaporator to warm up before proceeding. Once all of the prerequisites have been met, actuate the Cooldown Test by performing the following: If not done so previously, start the engine. Press and hold the A/C mode switch down and then turn the blower motor control to high speed. Continue to hold the A/C mode switch down until the A/C status indicator begins flashing, Then, release the mode switch. NOTE: The Cooldown Test can take up to 90 seconds to run. While the test is running, the A/C status indicator will flash once per second. If the test passes, the A/C status indicator will stop flashing. If the test fails, the A/C and EBL status indicators will flash alternately. The test will stop running if the either ignition is turned off, or the blower control is turned to any position other than high, or if DTC 83 or 84 sets during the test. Allow the test 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 Heater Control will display a DTC for every fault that it detects, not just DTCs specific to A/C performance. NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display any DTCs? Yes Diagnose and Repair the DTC(s). Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. Run the Cooldown Test again after the repair is complete. No As necessary, either Go To step 3) . or step 4) , or Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
3. 3) GENERAL SYSTEM OPERATION & FUNCTION TEST If not done so previously, start the engine. Turn the blower control on. Turn the Blend control to full cold. Turn the Mode control to panel. Press the A/C mode switch on, wait 30 seconds, press it off, and then proceed to the next step. Press the EBL mode switch on, wait 30 seconds, press it off, and then proceed to the next step. Turn the Blend control to full hot, wait 30 seconds, turn it to full cold, and then proceed to the next step. Turn the Mode control to every door position. Leave it in each position for 30 seconds. When complete, proceed to the next step. 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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. NOTE: If multiple DTCs are active, diagnose those that relate to a short circuit first. Read DTCs from the A/C status indictor. Does the A/C status indicator display any DTCs? Yes Diagnose and repair the DTC(s). Go To step 4) . if Overcurrent faults (DTC 41, 43, or 44) are present and run the Actuator Circuit Test / Door Calibration Function. Otherwise, refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of HVAC related symptoms. No If you are here due to a stored DTC, it is possible that a technician may not have erased the DTC following a repair. If possible, verify if the vehicle was recently in for this type of service. Otherwise, either Go To step 4) . or visually inspect the related wiring harness for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals, and repair as necessary. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .
4. 4) ACTUATOR CIRCUIT TEST / DOOR CALIBRATION FUNCTION NOTE: By running the Actuator Circuit Test / Door Calibration Function, the A/C Heater Control can identify up to three door driver circuits shorted simultaneously. A DTC 72 will set if more than three door driver circuits are shorted in the same direction (e.g. four door driver circuits all shorted to ground) or if two or more door driver circuits are shorted with at least one door driver circuit shorted to ignition and one door driver circuit shorted to ground. To ensure a proper diagnosis, diagnose and repair Actuator Circuit Test faults in the following order: If present, diagnose and repair DTC 72 first, then DTC 62, then DTC 61, then DTCs 64, 68, or 71, and finally DTCs 63, 67, or 69. In addition, always test the door driver circuits after each repair by clearing DTCs, and then running the Actuator Circuit Test / Door Calibration Function, and then checking for DTCs. NOTE: Diagnose and repair Actuator Circuit Test faults (DTC 61, 62, 63, 64, 67, 68, 69, 71, and 72) before diagnosing Overcurrent faults (DTC 41, 43, and 44) and Calibration faults (DTC 18, 21, 22, 23, 45, 46, 47, 51, 52, 53, 55, and 56). Diagnose and repair Overcurrent faults (DTC 41, 43, and 44) before diagnosing Calibration faults (DTC 18, 21, 22, 23, 45, 46, 47, 51, 52, 53, 55, and 56). If not done so previously, 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 flashing 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. However, if no DTCs were present, both status indicators will tun off and the system will exit diagnostic mode. 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 Heater Control will display a DTC for every fault that it detects, not just DTCs specific to door function. NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Read DTCs from the A/C status indictor. Does the A/C status indicator display any DTCs? Yes Diagnose and repair the DTC(s). Refer to the «DIAGNOSTIC CODE INDEX»(ref-255975-S09418495222007060500000) for a complete list of all HVAC related symptoms. No No problem found. However, if you are here due to a stored DTC, it is possible that a technician may not have erased the DTC following a repair. If possible, verify if the vehicle was recently in for this type of service. Otherwise, visually inspect the related wiring harness for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals, and repair as necessary. Perform BODY VERIFICATION TEST - VER 1. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)»(ref-255944-S31737016002007060500000) .