HVAC Systems - Electrical Diagnostics: Diagnosis Dodge Durango II

DIAGNOSIS AND TESTING

DTC INDEX

Diagnostic Test

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then 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»(ref-212849-S18360529192005122700000) . (Refer to «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) ). No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . (Refer to «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) ).

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then with the scan tool, read HVAC DTCs. Does the scan tool display active: B100D-FLOOR MODE SWITCH REQUEST INPUT CIRCUIT LOW? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then with the scan tool, read HVAC DTCs. Does the scan tool display active: B101C-TEMP DOWN SWITCH REQUEST INPUT CIRCUIT LOW? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then with the scan tool, read HVAC DTCs. Does the scan tool display active: B101F-POWER ON/OFF SWITCH REQUEST INPUT CIRCUIT LOW? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then with the scan tool, read HVAC DTCs. Does the scan tool display active: B102B-REAR FUNCTION CONTROL SWITCH REQUEST INPUT CIRCUIT LOW? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

Scheme 188

For the Automatic Temperature Control (ATC) circuit diagram (Refer to SCHEMATICS AND DIAGRAMS ).

1. RUN THE ACTUATOR DTC DETECTION TEST 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 DTC Detection. When the test is complete, select View DTCs. Repair Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs and then all short low DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms.

If this DTC is active, refer to B104C-BLEND DOOR CONTROL CIRCUIT/PERFORMANCE (MTC) , for the diagnostic test procedure. If this DTC is stored, refer to HVAC SYSTEM TEST (MTC) for stored DTC test procedures.

Scheme 189

For the Automatic Temperature Control (ATC) circuit diagram (Refer to SCHEMATICS AND DIAGRAMS ).

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 (ATC) Diagnose and repair the DTC(s). If present, diagnose and repair all Rear Blend and Rear Mode Door Control Circuit/Performance DTCs first, all other Control Circuit/Performance DTCs second, and all Control Circuit Open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. Yes (MTC) Diagnose and repair the DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 2
2. RUN THE ACTUATOR DTC DETECTION TEST With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes : Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs first, all short low DTCs second, and all open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 3
3. INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE DOOR TO SEIZE OR BIND Turn the ignition off. Inspect the actuator and the housing assembly for a condition causing the door to seize or bind. Are there any physical or mechanical problems with the door, housing, or actuator? Yes : Repair as necessary in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Go To 4
4. CHECK REAR MODE DOOR TRAVEL Remove the Rear Mode Door Actuator from the Rear A/C Heater Housing Assembly. By hand, attempt to rotate the door in both directions. The door should operate smoothly in both directions over approximately 60 degrees of travel. Does the door operate smoothly in both directions over approximately 60 degrees of travel? Yes : Replace the Rear Mode Door Actuator in accordance with the Service Information. Then, Go To 5. No : Repair as necessary in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .
5. RUN 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: B103E-REAR MODE DOOR TRAVEL RANGE TOO SMALL? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

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 (ATC) Diagnose and repair the DTC(s). If present, diagnose and repair all Rear Blend and Rear Mode Door Control Circuit/Performance DTCs first, all other Control Circuit/Performance DTCs second, and all Control Circuit Open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. Yes (MTC) Diagnose and repair the DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 2
2. RUN THE ACTUATOR DTC DETECTION TEST 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 DTC Detection. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes : Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs first, all short low DTCs second, and all open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 3
3. CHECK FOR A BROKEN REAR MODE DOOR ACTUATOR Turn the ignition off. Remove the Rear Mode Door Actuator from the Rear 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 Rear Mode Door Actuator in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Go To 4
4. CHECK REAR MODE DOOR & REAR A/C HEATER HOUSING FOR WARPED, WORN, DAMAGED, MISSING, & BROKEN COMPONENTS Inspect for a damaged or broken Rear A/C Heater Housing Assembly, a warped, worn, or broken door, and missing door seals. Rotate the door from stop to stop. The door should rotate approximately 60 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»(ref-212849-S18360529192005122700000) . No : Replace the Rear Mode Door Actuator in accordance with the Service Information. Then, Go To 5.
5. RUN 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: B103F-REAR MODE DOOR TRAVEL RANGE TOO LARGE? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

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 (ATC) Diagnose and repair the DTC(s). If present, diagnose and repair all Rear Blend and Rear Mode Door Control Circuit/Performance DTCs first, all other Control Circuit/Performance DTCs second, and all Control Circuit Open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. Yes (MTC) Diagnose and repair the DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 2
2. RUN THE ACTUATOR DTC DETECTION TEST With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes : Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs first, all short low DTCs second, and all open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 3
3. INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE DOOR TO SEIZE OR BIND Turn the ignition off. Inspect the actuator, linkage, and housing assembly for a condition causing the 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»(ref-212849-S18360529192005122700000) . No : Go To 4
4. CHECK MODE 2 (FLOOR TO DEFROST) DOOR TRAVEL Remove the Mode Door 2 (Floor to Defrost) 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 approximately 100 degrees. Does the door operate smoothly in both directions over approximately 100 degrees of travel? Yes : Replace the Mode Door 2 (Floor to Defrost) Actuator in accordance with the Service Information. Then, Go To 5. No : Repair as necessary in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .
5. RUN 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: B104A-FLOOR/DEFROST MODE DOOR TRAVEL RANGE TOO SMALL? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

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 (ATC) Diagnose and repair the DTC(s). If present, diagnose and repair all Rear Blend and Rear Mode Door Control Circuit/Performance DTCs first, all other Control Circuit/Performance DTCs second, and all Control Circuit Open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. Yes (MTC) Diagnose and repair the DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 2
2. RUN THE ACTUATOR DTC DETECTION TEST With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes : Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs first, all short low DTCs second, and all open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 3
3. CHECK FOR A BROKEN MODE DOOR 2 (FLOOR TO DEFROST) ACTUATOR Turn the ignition off. Remove the Mode Door 2 (Floor to Defrost) 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 2 (Floor to Defrost) Actuator in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Go To 4
4. CHECK MODE 2 (FLOOR TO DEFROST) 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»(ref-212849-S18360529192005122700000) . No : Replace the Mode 2 (Floor to Defrost) Actuator in accordance with the Service Information. Then, Go To 5.
5. RUN 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: B104B-FLOOR/DEFROST MODE DOOR TRAVEL RANGE TOO LARGE? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. RUN THE ACTUATOR DTC DETECTION TEST 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 DTC Detection. When the test is complete, select View DTCs. Repair Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs and then all short low DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms.

1. RUN THE ACTUATOR DTC DETECTION TEST Turn the ignition on. With the scan tool in HVAC, erase 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 DTC Detection. When the test is complete, select View DTCs. Repair Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs and then all short low DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms.

Scheme 190

For the Automatic Temperature Control (ATC) circuit diagram (Refer to SCHEMATICS AND DIAGRAMS ).

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 (ATC) Diagnose and repair the DTC(s). If present, diagnose and repair all Rear Blend and Rear Mode Door Control Circuit/Performance DTCs first, all other Control Circuit/Performance DTCs second, and all Control Circuit Open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. Yes (MTC) Diagnose and repair the DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 2
2. RUN THE ACTUATOR DTC DETECTION TEST With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes : Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short DTCs first, all short low DTCs second, and all open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 3
3. INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE DOOR TO SEIZE OR BIND Turn the ignition off. Inspect the actuator and the housing assembly for a condition causing the door to seize or bind. Are there any physical or mechanical problems with the door, housing, or actuator? Yes : Repair as necessary in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Go To 4
4. 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 approximately 70 degrees of travel. Does the door operate smoothly in both directions over approximately 70 degrees of travel? Yes : Replace the Recirculation Door Actuator in accordance with the Service Information. Then, Go To 5 No : Repair as necessary in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .
5. RUN 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»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

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 (ATC) Diagnose and repair the DTC(s). If present, diagnose and repair all Rear Blend and Rear Mode Door Control Circuit/Performance DTCs first, all other Control Circuit/Performance DTCs second, and all Control Circuit Open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. Yes (MTC) Diagnose and repair the DTC(s). Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 2
2. RUN THE ACTUATOR DTC DETECTION TEST With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes : Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs first, all short low DTCs second, and all open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 3
3. 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»(ref-212849-S18360529192005122700000) . No : Go To 4
4. CHECK RECIRCULATION DOOR & A/C HEATER HOUSING FOR WARPED, WORN, DAMAGED, MISSING, & BROKEN COMPONENTS Inspect for a damaged or broken A/C Heater Housing Assembly, a warped, worn, or broken door, and missing door seals. Rotate the door from stop to stop. The door should rotate approximately 70 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»(ref-212849-S18360529192005122700000) . No : Replace the Recirculation Door Actuator in accordance with the Service Information. Then, Go To 5.
5. RUN 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»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

Scheme 191

For the Automatic Temperature Control (ATC) circuit diagram (Refer to SCHEMATICS AND DIAGRAMS ).

1. CHECK THE CMTC FOR DTCs Turn the ignition on. With the scan tool, check the Compass Temperature Module (EOM) for DTCs. Are any DTCs present? Yes : (Refer to «OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS»(ref-212793) ) for the related symptom(s). Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Replace the IR Sensor in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. VERIFY THAT DTC B108F-AUTOMATIC TEMPERATURE CONTROL SYSTEM PERFORMANCE IS ACTIVE With the scan tool, read HVAC DTCs. Is DTC B108F-AUTOMATIC TEMPERATURE CONTROL SYSTEM PERFORMANCE active? Yes : Go To 2 No : A technician may not have erased this DTC following a module or CAN Bus 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. Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .
2. CHECK FOR ACTIVE DTC U0019-CAN B BUS CIRCUIT With the scan tool, read active HVAC DTCs. Does the scan tool display active: U0019-CAN B BUS CIRCUIT? Yes : Diagnose and repair the DTC. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Go To 3
3. VERIFY THAT THE PCM, FCM, & EOM ARE ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select ECU View. Verify that the PCM, FCM, & EOM are active on the bus. Are all of the modules active on the bus? Yes : Go To 4 No : (Refer to «ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS»(ref-212762) ) for No Response diagnostic procedures. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .
4. CHECK FOR DTCs IN THE PCM, FCM, & EOM With the scan tool, select ECU View. Check for DTCs in the PCM, FCM, and EOM. Are DTCs present in any of the modules? Yes : Diagnose and repair the DTC(s). (Refer to «OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS»(ref-212793) ) for EOM DTCs, (Refer to «ENGINE ELECTRICAL DIAGNOSTICS»(ref-212813) ) for PCM DTCs, and refer to the appropriate category for «ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS»(ref-212762) . Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then 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»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then with the scan tool, read HVAC DTCs. Does the scan tool display active: B1004-PANEL MODE SWITCH REQUEST INPUT CIRCUIT LOW? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then with the scan tool, read HVAC DTCs. Does the scan tool display active: B1007-BI-LEVEL SWITCH REQUEST INPUT CIRCUIT LOW? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then with the scan tool, read HVAC DTCs. Does the scan tool display active: B1010-MIX SWITCH REQUEST INPUT CIRCUIT LOW? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then with the scan tool, read HVAC DTCs. Does the scan tool display active: B1013-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»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then 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»(ref-212849-S18360529192005122700000) No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then with the scan tool, read HVAC DTCs. Does the scan tool display active: B1019-TEMP UP SWITCH REQUEST INPUT CIRCUIT LOW? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then with the scan tool, read HVAC DTCs. Does the scan tool display active: B1022-BLOWER SPEED UP SWITCH REQUEST INPUT CIRCUIT LOW? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then with the scan tool, read HVAC DTCs. Does the scan tool display active: B1025-BLOWER SPEED DOWN SWITCH REQUEST INPUT CIRCUIT LOW? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

Scheme 192

For the Automatic Temperature Control (ATC) circuit diagram (Refer to SCHEMATICS AND DIAGRAMS ).

1. PERFORM «B1034-INFRARED TEMPERATURE SENSOR INPUT CIRCUIT LOW TEST»(ref-212849-S30120722772005122700000) Repair Perform test B1034-INFRARED TEMPERATURE SENSOR INPUT CIRCUIT LOW TEST. (Refer to «OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS»(ref-212793) ). Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. PERFORM B1035-INFRARED TEMPERATURE SENSOR INPUT CIRCUIT HIGH TEST Repair Perform test B1035-Infrared Temperature Sensor Input Circuit High test. (Refer to «OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS»(ref-212793) ). Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then with the scan tool, read HVAC DTCs. Does the scan tool display active: B1038-AUTO SWITCH REQUEST INPUT CIRCUIT LOW? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. RUN THE ACTUATOR DTC DETECTION TEST 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 DTC Detection. When the test is complete, select View DTCs. Repair Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs and then all short low DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms.

If this DTC is active, refer to B104C-BLEND DOOR CONTROL CIRCUIT/PERFORMANCE (MTC) for the diagnostic test procedure. If this DTC is stored, refer to HVAC SYSTEM TEST (MTC) for stored DTC test procedures.

Scheme 193

For the Automatic Temperature Control (ATC) circuit diagram (Refer to SCHEMATICS AND DIAGRAMS ).

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 (ATC) : Diagnose and repair the DTC(s). If present, diagnose and repair all Rear Blend and Rear Mode Door Control Circuit/Performance DTCs first, all other Control Circuit/Performance DTCs second, and all Control Circuit Open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. Yes (MTC) : Diagnose and repair the DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 2
2. RUN THE ACTUATOR DTC DETECTION TEST With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes : Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs first, all short low DTCs second, and all open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 3
3. INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE DOOR TO SEIZE OR BIND Turn the ignition off. Inspect the actuator, linkage, and housing assembly for a condition causing the 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»(ref-212849-S18360529192005122700000) . No : Go To 4
4. CHECK MODE 1 (FLOOR TO PANEL) DOOR TRAVEL Remove the Mode Door 1 (Floor to Panel) 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 approximately 90 degrees of travel. Does the door operate smoothly in both directions over approximately 90 degrees of travel? Yes : Replace the Mode Door 1 (Floor to Panel) Actuator in accordance with the Service Information. Then, Go To 5. No : Repair as necessary in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .
5. RUN 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»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

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 (ATC) : Diagnose and repair the DTC(s). If present, diagnose and repair all Rear Blend and Rear Mode Door Control Circuit/Performance DTCs first, all other Control Circuit/Performance DTCs second, and all Control Circuit Open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. Yes (MTC) : Diagnose and repair the DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 2
2. RUN THE ACTUATOR DTC DETECTION TEST With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes : Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs first, all short low DTCs second, and all open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 3
3. CHECK FOR A BROKEN MODE DOOR 1 (FLOOR TO PANEL) ACTUATOR Turn the ignition off. Remove the Mode Door 1 (Floor to Panel) 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 1 (Floor to Panel) Actuator in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Go To 4
4. CHECK MODE 1 (FLOOR TO PANEL) 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 90 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»(ref-212849-S18360529192005122700000) . No : Replace the Mode Door 1 (Floor to Panel) Actuator in accordance with the Service Information. Then, Go To 5.
5. RUN 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: 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»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. RUN THE ACTUATOR DTC DETECTION TEST 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 DTC Detection. When the test is complete, select View DTCs. Repair Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs and then all short low DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms.

If this DTC is active, refer to B104C-BLEND DOOR CONTROL CIRCUIT/PERFORMANCE (MTC) for the diagnostic test procedure. If this DTC is stored, refer to HVAC SYSTEM TEST (MTC) for stored DTC test procedures.

Scheme 194

For the Automatic Temperature Control (ATC) circuit diagram (Refer to SCHEMATICS AND DIAGRAMS ).

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 (ATC) : Diagnose and repair the DTC(s). If present, diagnose and repair all Rear Blend and Rear Mode Door Control Circuit/Performance DTCs first, all other Control Circuit/Performance DTCs second, and all Control Circuit Open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. Yes (MTC) : Diagnose and repair the DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 2
2. RUN THE ACTUATOR DTC DETECTION TEST With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes : Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs first, all short low DTCs second, and all open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 3
3. INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE DOOR TO SEIZE OR BIND Turn the ignition off. Inspect the actuator, linkage, and housing assembly for a condition causing the 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»(ref-212849-S18360529192005122700000) . No : Go To 4
4. CHECK FRONT BLEND DOOR TRAVEL Remove the Front 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 approximately 65 degrees of travel. Does the door operate smoothly in both directions over approximately 65 degrees of travel? Yes : Replace the Front Blend Door Actuator in accordance with the Service Information. Then, Go To 5. No : Repair as necessary in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .
5. RUN 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: B1050-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»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

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 (ATC) : Diagnose and repair the DTC(s). If present, diagnose and repair all Rear Blend and Rear Mode Door Control Circuit/Performance DTCs first, all other Control Circuit/Performance DTCs second, and all Control Circuit Open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. Yes (MTC) : Diagnose and repair the DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 2
2. RUN THE ACTUATOR DTC DETECTION TEST With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes : Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs first, all short low DTCs second, and all open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 3
3. CHECK FOR A BROKEN FRONT BLEND DOOR ACTUATOR Turn the ignition off. Remove the Front 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 Front Blend Door Actuator in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Go To 4
4. CHECK FRONT 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 65 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»(ref-212849-S18360529192005122700000) . No : Replace the Front Blend Door Actuator in accordance with the Service Information. Then, Go To 5.
5. RUN 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: B1051-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»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

If this DTC is active, refer to B103A-REAR MODE DOOR CONTROL CIRCUIT/PERFORMANCE (ATC) for the diagnostic test procedure. If this DTC is stored, refer to HVAC SYSTEM TEST (ATC) for stored DTC test procedures.

If this DTC is active, refer to B104C-BLEND DOOR CONTROL CIRCUIT/PERFORMANCE (MTC) for the diagnostic test procedure. If this DTC is stored, refer to HVAC SYSTEM TEST (MTC) for stored DTC test procedures.

Scheme 195

For the Automatic Temperature Control (ATC) circuit diagram (Refer to SCHEMATICS AND DIAGRAMS ).

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 (ATC) : Diagnose and repair the DTC(s). If present, diagnose and repair all Rear Blend and Rear Mode Door Control Circuit/Performance DTCs first, all other Control Circuit/Performance DTCs second, and all Control Circuit Open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. Yes (MTC) : Diagnose and repair the DTC(s). Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 2
2. RUN THE ACTUATOR DTC DETECTION TEST With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes : Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs first, all short low DTCs second, and all open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 3
3. INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE DOOR TO SEIZE OR BIND Turn the ignition off. Inspect the actuator and the housing assembly for a condition causing the door to seize or bind. Are there any physical or mechanical problems with the door, housing, or actuator? Yes : Repair as necessary in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Go To 4
4. CHECK REAR BLEND DOOR TRAVEL Remove the Rear Blend Door Actuator from the Rear A/C Heater Housing Assembly. By hand, attempt to rotate the door in both directions. The door should operate smoothly in both directions over approximately 70 degrees of travel. Does the door operate smoothly in both directions over approximately 70 degrees of travel? Yes : Replace the Rear Blend Door Actuator in accordance with the Service Information. Then, Go To 5. No : Repair as necessary in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .
5. RUN 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: B1056-REAR 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»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

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 (ATC) : Diagnose and repair the DTC(s). If present, diagnose and repair all Rear Blend and Rear Mode Door Control Circuit/Performance DTCs first, all other Control Circuit/Performance DTCs second, and all Control Circuit Open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. Yes (MTC) : Diagnose and repair the DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 2
2. RUN THE ACTUATOR DTC DETECTION TEST With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes : Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs first, all short low DTCs second, and all open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 3
3. CHECK FOR A BROKEN REAR BLEND DOOR ACTUATOR Turn the ignition off. Remove the Rear Blend Door Actuator from the Rear 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 Rear Blend Door Actuator in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Go To 4
4. CHECK REAR BLEND DOOR & REAR A/C HEATER HOUSING FOR WARPED, WORN, DAMAGED, MISSING, & BROKEN COMPONENTS Inspect for a damaged or broken Rear A/C Heater Housing Assembly, a warped, worn, or broken door, and missing door seals. Rotate the door from stop to stop. The door should rotate approximately 70 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»(ref-212849-S18360529192005122700000) . No : Replace the Rear Blend Door Actuator in accordance with the Service Information. Then, Go To 5.
5. RUN 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: B1057-REAR 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»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. RUN THE ACTUATOR DTC DETECTION TEST 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 DTC Detection. When the test is complete, select View DTCs. Repair Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs and then all short low DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms.

If this DTC is active, refer to B104C-BLEND DOOR CONTROL CIRCUIT/PERFORMANCE (MTC) for the diagnostic test procedure. If this DTC is stored, refer to HVAC SYSTEM TEST (MTC) for stored DTC test procedures.

Scheme 196

For the Automatic Temperature Control (ATC) circuit diagram (Refer to SCHEMATICS AND DIAGRAMS ).

1. CHECK FOR DTCs IN THE A/C HEATER CONTROL MODULE Turn the ignition on. With the scan tool, select ECU View. With the scan tool, select HVAC. Are any DTCs present in the A/C Heater Control Module? Yes : Diagnose and Repair the DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. Rerun the Cooldown Test after the repair is complete. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Go To 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). (Refer to «ENGINE ELECTRICAL DIAGNOSTICS»(ref-212813) ) for PCM DTCs. Rerun the Cooldown Test after the repair is complete. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Refer to the Service Information for additional Cool down Test related diagnostic information and testing procedures. Rerun the Cooldown Test after the repair is complete. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

Scheme 197

For the Automatic Temperature Control (ATC) circuit diagram (Refer to SCHEMATICS AND DIAGRAMS ).

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 (ATC) : Diagnose and repair the DTC(s). If present, diagnose and repair all Rear Blend and Rear Mode Door Control Circuit/Performance DTCs first, all other Control Circuit/Performance DTCs second, and all Control Circuit Open DTCs last. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. Yes (MTC) : Diagnose and repair the DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 2
2. RUN THE ACTUATOR DTC DETECTION TEST 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 DTC Detection. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes : Diagnose and repair the DTCs. If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs and then all short low DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 3
3. 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 DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : Go To 4
4. CHECK MODE, BLEND & RECIRCULATION DOOR OPERATION Start the engine. Set the blower to high speed. Operate each door in all positions in one direction and then in the opposite direction while monitoring the following: For the Mode Doors, verify that air flows from each vent accordingly for the position selected on the A/C Heater Control. For the Blend Doors, verify that the airflow air temperature changes accordingly for the temperature range selected on the A/C Heater Control. For the Recirculation Door, verify that the sound of the air flow get louder as the recirculation door opens to bring in recirculated air or 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»(ref-212849-S18360529192005122700000) . 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»(ref-212849-S18360529192005122700000) .

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»(ref-212849-S18360529192005122700000) .

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object. Turn the ignition on. With the scan tool, erase HVAC DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes, then with the scan tool, read HVAC DTCs. Does the scan tool display active: B2310-REAR WASHER SWITCH INPUT CIRCUIT LOW? Yes : Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) . No : Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

Scheme 198

For the Automatic Temperature Control (ATC) circuit diagram (Refer to SCHEMATICS AND DIAGRAMS ).

(Refer to ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS ) for the diagnostic test procedure.

(Refer to ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS ) for the diagnostic test procedure.

Refer to B1079-CLIMATE CONTROL COOL DOWN TEST EXCESSIVE TIME (ATC & MTC) for the diagnostic test procedure.

Refer to B1079-CLIMATE CONTROL COOL DOWN TEST EXCESSIVE TIME (ATC & MTC) for the diagnostic test procedure.

Refer to B1079-CLIMATE CONTROL COOL DOWN TEST EXCESSIVE TIME (ATC & MTC) for the diagnostic test procedure.

*HVAC SYSTEM TEST (ATC)

For the Automatic Temperature Control (ATC) circuit diagram (Refer to SCHEMATICS AND DIAGRAMS ).

1. Yes, Refrigerant Temperature Sensor Error : Refer to «B1079-CLIMATE CONTROL COOL DOWN TEST EXCESSIVE TIME (ATC & MTC)»(ref-212849-S30826678142005122700000) for the diagnostic test procedure.

1. Yes, DTC Set During Routine - Test Not Passed : Refer to «B1079-CLIMATE CONTROL COOL DOWN TEST EXCESSIVE TIME (ATC & MTC)»(ref-212849-S30826678142005122700000) for the diagnostic test procedure.
2. No : As necessary, either Go To 3, 6 , or 7 , or Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .
3. HVAC SYSTEM TEST NOTE: The HVAC System Test consists of four tests. Test 2 tests A/C system performance, Test 3 tests for mode switch, door actuator circuit, auxiliary coolant pump circuit, and rear blower control circuit faults, Test 4 tests for shorted door actuator circuits, and Test 5 tests for door actuator calibration faults. Either perform all four tests for a complete system test or perform an individual test if diagnosing a specific symptom. NOTE: Active DTCs must be resolved before diagnosing stored DTCs. Start the engine. With the scan tool, erase HVAC DTCs. Press the ATC's POWER switch on. Choose a diagnostic test to perform Complete HVAC System Test : Go To 2 A/C System Performance Test : Go To 2 Mode Switch, Door Actuator Ckt, Auxiliary Coolant Pump Ckt, & Rear Blower Control Ckt Test : Go To 5 Actuator DTC Detection Test : Go To 6 Actuator Calibration Test : Go To 7
4. A/C SYSTEM PERFORMANCE TEST NOTE: The work area ambient temperature must be above 15.6°C (60°F) and the evaporator temperature must be above 18.3°C (65°F) in order to test A/C system performance. NOTE: Before actuating the Cooldown Test, 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 with the test. NOTE: Running the Cooldown test will cause the A/C status indicator to flash. NOTE: One or more status messages will display on the scan tool after running the Cooldown Test. These messages will clear after paging back out of this test function. Therefore, it is important to note all messages before doing so. Verify that the front blower motor operates correctly in all speeds. Diagnose and repair all blower related faults before proceeding with this test. With the scan tool in HVAC, select System Tests and then select Cooldown test. Allow the test to run to completion. Does the scan tool display a status message that indicates a fault has occurred? Yes, Conditions Too Cold - Test Not Run : If running, turn the A/C compressor off. Verify that the work area ambient temperature is above 15.6°C (60°F). If not, move the vehicle to a warmer work area. Verify that the evaporator temperature is above 18.3°C (65°F). If not, set the front blower to high speed and allow the blower to run for five minutes. Then, rerun the Cooldown Test. Yes, No Results Stored/Test Not Complete : Verify that power is not interrupted while rerunning the Cooldown Test.
5. MODE SWITCH, DOOR ACTUATOR CIRCUIT, AUXILIARY COOLANT PUMP CIRCUIT, & REAR BLOWER CONTROL CIRCUIT 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. Set the front blower speed to low. Set the Rear Fan switch on the Rear A/C Heater Control to off. Set the Rear Blend switch on the Rear A/C Heater Control to full cold. Monitor the scan tool for active HVAC DTCs while performing the following test steps. Press the AUTO mode switch, wait 30 seconds and then proceed to the next step. Press the A/C mode switch on, wait 30 seconds, press it off, and then proceed to the next step. Press the RECIRC mode switch on, wait 30 seconds, press it off, and then proceed to the next step. Press the TEMP + mode switch until the temperature is set to the max heat setting, wait 30 seconds and then proceed to the next step. Press the TEMP - mode switch until the temperature is set to the max cool setting, wait 30 seconds and then proceed to the next step. Press the FLOOR mode switch, wait 30 seconds and then proceed to the next step. Press the PANEL mode switch, wait 30 seconds and then proceed to the next step. Press the BI-LEVEL mode switch, wait 30 seconds and then proceed to the next step. Press the MIX mode switch, wait 30 seconds 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 FRONT DEFROST mode switch, wait 30 seconds and then proceed to the next step. Press and hold the REAR WASHER mode switch for several seconds, release it, and then proceed to the next step. Press the FAN - mode switch until the front blower speed is set to low, wait 30 seconds and then proceed to the next step. Press the FAN + mode switch until the front blower speed is set to the high, wait 30 seconds and then proceed to the next step. Press the FAN - mode switch until the front blower speed is set to low and then proceed to the next step. Press the REAR FUNCTION mode switch. The rear-blower speed settings should display on the ATC display panel. Then, within 7 seconds, press the FAN + mode switch until the rear blower speed is set to high, wait 30 seconds and then proceed to the next step. Press the REAR FUNCTION mode switch. The rear-blower speed settings should display on the ATC display panel. Then, within 7 seconds, press the FAN - mode switch until the rear blower speed is set to low, wait 30 seconds and then proceed to the next step. Press the REAR FUNCTION mode switch. The words "CONTROL IN REAR" should display on the ATC display panel. Slowly turn the Rear Fan switch on the Rear A/C Heater Control to high speed. Slowly turn the Rear Blend switch on the Rear A/C Heater Control to full hot, wait 30 seconds and then turn it back to full cold. Slowly turn the Rear Fan switch on the Rear A/C Heater Control to off. With the scan tool, select the following: Actuators, Auxiliary Coolant Pump, Start, and Constant On. Allow the pump to run for approximately one minute. Does the scan tool display any active DTCs? Yes : Diagnose and repair the DTC(s). Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : As necessary, either Go To 4 or 7 , or Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .
6. ACTUATOR DTC DETECTION TEST With the scan tool, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes : Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs and then all short low DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : As necessary, either Go To 5 or Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .
7. 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 DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : No problem found. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

*HVAC SYSTEM TEST (MTC)

For the Manual Temperature Control (MTC) circuit diagram (Refer to SCHEMATICS AND DIAGRAMS ).

1. Yes, Refrigerant Temperature Sensor Error : Refer to «B1079-CLIMATE CONTROL COOL DOWN TEST EXCESSIVE TIME (ATC & MTC)»(ref-212849-S30826678142005122700000) for the diagnostic test procedure.

1. Yes, DTC Set During Routine - Test Not Passed : Refer to «B1079-CLIMATE CONTROL COOL DOWN TEST EXCESSIVE TIME (ATC & MTC)»(ref-212849-S30826678142005122700000) for the diagnostic test procedure.
2. No : As necessary, either Go To 3, 4, or 5, or Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .
3. HVAC SYSTEM TEST NOTE: The HVAC System Test consists of four tests. Test 2 tests A/C system performance, Test 3 tests for mode switch, door actuator circuit, and auxiliary coolant pump circuit faults, Test 4 tests for shorted door actuator circuits, and Test 5 tests for door actuator calibration faults. Either perform all four tests for a complete system test or perform an individual test if diagnosing a specific symptom. NOTE: Active DTCs must be resolved before diagnosing stored DTCs. Start the engine. With the scan tool, erase HVAC DTCs. Choose a diagnostic test to perform Complete HVAC System Test : Go To 2 A/C System Performance Test : Go To 2 Mode Switch, Door Actuator Ckt, & Auxiliary Coolant Pump Ckt Test : Go To 5 Actuator DTC Detection Test : Go To 6 Actuator Calibration Test : Go To 7
4. A/C SYSTEM PERFORMANCE TEST NOTE: The work area ambient temperature must be above 15.6°C (60°F) and the evaporator temperature must be above 18.3°C (65°F) in order to test A/C system performance. NOTE: Before actuating the Cooldown Test, verify that the mode setting is not in a defrost position and 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 with the test. NOTE: Running the Cooldown test will cause the A/C status indicator to flash. NOTE: One or more status messages will display on the scan tool after running the Cooldown Test. These messages will clear after paging back out of this test function. Therefore, it is important to note all messages before doing so. Set the mode to the Panel position. Verify that the front blower motor operates correctly in all speeds. Diagnose and repair all blower related faults before proceeding with this test. Set the front blower speed to high. With the scan tool in HVAC, select System Tests and then select Cooldown test. Allow the test to run to completion. Does the scan tool display a status message that indicates a fault has occurred? Yes, Conditions Too Cold - Test Not Run : If running, turn the A/C compressor off. Verify that the work area ambient temperature is above 15.6°C (60°F). If not, move the vehicle to a warmer work area. Verify that the evaporator temperature is above 18.3°C (65°F). If not, set the front blower to high speed and allow the blower to run for five minutes. Then, rerun the Cooldown Test. Yes, Blowers Not On High - Test Not Run : Set the front blower speed to high speed and then rerun the Cooldown Test. Yes, No Results Stored/Test Not Complete : Verify that power is not interrupted while rerunning the Cooldown Test.
5. MODE SWITCH, DOOR ACTUATOR CIRCUIT, & AUXILIARY COOLANT PUMP CIRCUIT 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. Set the front blower speed to low. Set the Blend control to full cold. Set the Mode control to Bi-Level/Recirc. If equipped, set the Rear Fan switch on the Rear A/C Heater Control to off. If equipped, set the Rear Blend switch on the Rear A/C Heater Control to full cold. 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 and hold the Rear Washer mode switch for several seconds, release it, and then proceed to the next step. Set the Blend control to full hot, wait 30 seconds and then set it to full cold. Turn the Mode control to every door position. Leave it in each position for 30 seconds. If equipped, set the Rear Blower control to Rear Control. If equipped, set the Rear Fan switch on the Rear A/C Heater Control to high speed. If equipped, slowly turn the Rear Blend switch on the Rear A/C Heater Control to full hot, wait 30 seconds and then turn it back to full cold. If equipped, turn the Rear Fan switch on the Rear A/C Heater Control to off. If equipped with rear HVAC, with the scan tool, select the following: Actuators, Auxiliary Coolant Pump, Start, and Constant On. Allow the pump to run for approximately one minute. Does the scan tool display any active DTCs? Yes : Diagnose and repair the DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : As necessary, either Go To 4 or 7 , or Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .
6. ACTUATOR DTC DETECTION TEST With the scan tool, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs. Does the scan tool display any DTCs? Yes : Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs and then all short low DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : As necessary, either Go To 5 or Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .
7. 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 DTCs. Refer to «DTC INDEX»(ref-212849-S07720664322006072600000) table for a complete list of all HVAC related symptoms. No : No problem found. Perform «BODY VERIFICATION TEST - VER 1»(ref-212849-S18360529192005122700000) .

1. Perform «BODY VERIFICATION TEST»(ref-212849-S18360529192005122700000) Disconnect all jumper wires and reconnect all previously disconnected components and connectors. Ensure that all accessories are turned off. Ensure that the battery is fully charged. Turn the ignition on. With the scan tool, record and erase DTCs from all modules. If repairs were made to any of the HVAC door actuator circuits, with the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. The test must pass before proceeding to the next step. If repairs were made to any of the HVAC doors, linkage, door actuators, or door actuator circuits, with the scan tool in HVAC, select System Tests and then select Actuator Calibration Test. The test must pass before proceeding to the next step. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Operate all functions of the system that caused the original concern. With the scan tool, select ECU View. Check for DTCs in the modules. Are DTCs present in any of the modules or is the original condition still present? Yes : The repair is not complete. Refer to the related category for the DTC or symptom that is still present. No : The repair is complete.

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