HVAC Systems - Electrical Diagnostics: Diagnosis Dodge Avenger II

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

On-Board Diagnostics

Note. Always inspect the IOD fuse prior to diagnosing any heating-A/C system concerns. Make sure the fuse is functional and fully seated into the terminals of the totally integrated power module (TIPM) located in the engine compartment.

The A/C-heater control communicates on the controller area network (CAN) B bus and is fully addressable with a scan tool.

The A/C-heater control's primary means of fault detection is through active and stored diagnostic trouble codes (DTCs). Active DTCs are those which currently exist in the system. The condition causing the fault must be repaired in order to clear this type of DTC. Stored DTCs are those which occurred in the system since the A/C-heater control received the last clear diagnostic info message. All DTCs must be read with a scan tool.

The A/C-heater control's secondary means of fault detection is through system tests. These tests include the HVAC System Test, the A/C Cooldown Test, the Actuator Calibration Function, and for MTC Systems, the Actuator DTC Detection Test. Refer to SYSTEM TESTS for a detailed description of each test.

HVAC System Test

This test provides a starting point in the diagnostic process by identifying the appropriate system test to perform when diagnosing a given condition or DTC. It also provides a means for testing the entire HVAC system by utilizing the A/C-heater control's On-Board System Tests. The On-Board System Tests can also assist in diagnosing stored DTCs.

A/C Cooldown Test

The A/C Cooldown Test

1. is actuated with a scan tool.
2. tests A/C system performance based on evaporator temperature sensor input.
3. will fail if evaporator starting temperature is below 18°C (65°F) when initiating the test.
4. will pass if the evaporator temperature drops 11°C (20°F).
5. indicates test outcome by displaying one or more test status messages on the scan tool. These messages will clear after paging back out of this test function. Therefore, is it important to note all of the messages before doing so.
6. will cause the A/C status indicator to flash while the test is running.

Actuator DTC Detection Test

The Actuator DTC Detection Test

1. is actuated with a scan tool.
2. supplements the continuous diagnostics on the actuator drive system.
3. monitors for shorted actuator circuits allowing service to easily diagnose and troubleshoot up to three simultaneous shorts. Shorted actuator circuit faults (XXX Control Circuit High or XXX Control Circuit Low) will only display after running the Actuator DTC Detection Test.

After repairing each DTC, cycle the ignition switch, and then rerun the Actuator DTC Detection test to ensure that no new DTCs exist. If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high faults and then short low faults. When the test returns passed, proceed with troubleshooting by clearing faults and running the Actuator Calibration function as a final check of proper system operation.

Diagnostic Test

1. VERIFY THE DTC IS STILL ACTIVE 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 10 minutes before proceeding. With the scan tool, read HVAC DTCs. Does the scan tool display this DTC? Yes Go To 2 . No The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
2. CHECK FOR NORMAL A/C REQUEST SWITCH AND STATUS INDICATOR FUNCTION Set the Blower control to any position except Off. Set the Mode control to any position except Auto. Press the A/C request 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 4 . No Go To 3 .
3. INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE A/C REQUEST SWITCH TO STAY OR STICK IN A PUSHED POSITION Inspect the A/C Heater Control for anything that would cause the A/C request switch to stay or stick in a pushed position. Is anything present that would cause the A/C request switch to stay or stick in a pushed position? Yes Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Go To 4 .
4. 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»(ref-305767-S12156571892008120200000) . No Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

1. VERIFY THE DTC IS STILL ACTIVE 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 10 minutes before proceeding. With the scan tool, read HVAC DTCs. Does the scan tool display this DTC? Yes Go To 2 . No The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
2. CHECK FOR NORMAL PANEL MODE SWITCH AND STATUS INDICATOR FUNCTION Set the Blower control to any position except Off. Set the Mode control to any position except Auto. Press the Panel mode switch on and off several times while observing the Panel mode status indicator. Does the Panel mode status indicator turn on and off? Yes Go To 4 . No Go To 3 .
3. INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE PANEL MODE SWITCH TO STAY OR STICK IN A PUSHED POSITION Inspect the A/C Heater Control for anything that would cause the Panel mode switch to stay or stick in a pushed position. Is anything present that would cause the Panel mode switch to stay or stick in a pushed position? Yes Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Go To 4 .
4. 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»(ref-305767-S12156571892008120200000) . No Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

1. VERIFY THE DTC IS STILL ACTIVE 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 2 minutes before proceeding. With the scan tool, read HVAC DTCs. Does the scan tool display this DTC? Yes Replace the A/C Heater Control in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

1. VERIFY THE DTC IS STILL ACTIVE 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 10 minutes before proceeding. With the scan tool, read HVAC DTCs. Does the scan tool display this DTC? Yes Go To 2 . No The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
2. CHECK FOR NORMAL RECIRCULATION SWITCH AND STATUS INDICATOR FUNCTION Set the Blower control to any position except Off. Set the Mode control to any position except Auto. Press the Recirculation switch on and off several times while observing the Recirculation status indicator. Does the Recirculation status indicator turn on and off? Yes Go To 4 . No Go To 3 .
3. INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE RECIRCULATION SWITCH TO STAY OR STICK IN A PUSHED POSITION Inspect the A/C Heater Control for anything that would cause the Recirculation switch to stay or stick in a pushed position. Is anything present that would cause the Recirculation switch to stay or stick in a pushed position? Yes Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Go To 4 .
4. 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»(ref-305767-S12156571892008120200000) . No Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

1. VERIFY THE DTC IS STILL ACTIVE 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 2 minutes before proceeding. With the scan tool, read HVAC DTCs. Does the scan tool display this DTC? Yes Replace the A/C Heater Control in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

1. VERIFY THE DTC IS STILL ACTIVE 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 2 minutes before proceeding. With the scan tool, read HVAC DTCs. Does the scan tool display this DTC? Yes Replace the A/C Heater Control in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

1. VERIFY THE DTC IS STILL ACTIVE 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 10 minutes before proceeding. With the scan tool, read HVAC DTCs. Does the scan tool display this DTC? Yes Go To 2 . No The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
2. CHECK FOR NORMAL DEFROST SWITCH AND STATUS INDICATOR FUNCTION Set the Blower control to any position except Off. Set the Mode control to any position except Auto. Press the Defrost switch on and off several times while observing the Defrost status indicator. Does the Defrost status indicator turn on and off? Yes Go To 4 . No Go To 3 .
3. INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE DEFROST SWITCH TO STAY OR STICK IN A PUSHED POSITION Inspect the A/C Heater Control for anything that would cause the Defrost switch to stay or stick in a pushed position. Is anything present that would cause the Defrost switch to stay or stick in a pushed position? Yes Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Go To 4 .
4. 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»(ref-305767-S12156571892008120200000) . No Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

1. VERIFY THE DTC IS STILL ACTIVE 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 10 minutes before proceeding. With the scan tool, read HVAC DTCs. Does the scan tool display this DTC? Yes Go To 2 . No The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
2. CHECK FOR NORMAL REAR DEFROST SWITCH AND STATUS INDICATOR FUNCTION Set the Blower control to any position except Off. Set the Mode control to any position except Auto. Press the Rear Defrost switch on and off several times while observing the Rear Defrost status indicator. Does the Rear Defrost status indicator turn on and off? Yes Go To 4 . No Go To 3 .
3. INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE REAR DEFROST SWITCH TO STAY OR STICK IN A PUSHED POSITION Inspect the A/C Heater Control for anything that would cause the Rear Defrost switch to stay or stick in a pushed position. Is anything present that would cause the Rear Defrost switch to stay or stick in a pushed position? Yes Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Go To 4 .
4. 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»(ref-305767-S12156571892008120200000) . No Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

Scheme 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»(ref-305767-S12156571892008120200000) .

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-305767-S12156571892008120200000) .

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-305767-S12156571892008120200000) .

Scheme 2

1. CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE AND CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active CONTROL CIRCUIT/PERFORMANCE or CONTROL CIRCUIT OPEN DTCs? Yes 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 «DIAGNOSTIC CODE INDEX»(ref-305859-S34530590652008120200000) for a complete list of all HVAC related DTCs. No Go To 2 .
2. INSPECT ACTUATOR AND 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-305767-S12156571892008120200000) . No Go To 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 approximately 90 degrees of travel. Does the door operate smoothly in both directions over approximately 90 degrees of travel? Yes Replace the Mode Door Actuator in accordance with the service information. Then, Go To 4 . No Repair as necessary in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
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 this DTC as active? Yes Replace the A/C Heater Control in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

1. CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE AND CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active CONTROL CIRCUIT/PERFORMANCE or CONTROL CIRCUIT OPEN DTCs? Yes 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 «DIAGNOSTIC CODE INDEX»(ref-305859-S34530590652008120200000) for a complete list of all HVAC related DTCs. No Go To 2 .
2. 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-305767-S12156571892008120200000) . No Go To 3 .
3. CHECK MODE 1 (FLOOR TO PANEL) DOOR AND A/C HEATER HOUSING FOR WARPED, WORN, DAMAGED, MISSING, AND 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-305767-S12156571892008120200000) . No Replace the Mode Door 1 (Floor to Panel) Actuator in accordance with the service information. Then, Go To 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 this DTC as active? Yes Replace the A/C Heater Control in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

1. CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE AND CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active CONTROL CIRCUIT/PERFORMANCE or CONTROL CIRCUIT OPEN DTCs? Yes 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 «DIAGNOSTIC CODE INDEX»(ref-305859-S34530590652008120200000) for a complete list of all HVAC related DTCs. No Go To 2 .
2. INSPECT ACTUATOR AND 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-305767-S12156571892008120200000) . No Go To 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 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 4 . No Repair as necessary in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
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 this DTC as active? Yes Replace the A/C Heater Control in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

1. CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE AND CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active CONTROL CIRCUIT/PERFORMANCE or CONTROL CIRCUIT OPEN DTCs? Yes 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 «DIAGNOSTIC CODE INDEX»(ref-305859-S34530590652008120200000) for a complete list of all HVAC related DTCs. No Go To 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»(ref-305767-S12156571892008120200000) . No Go To 3 .
3. CHECK RECIRCULATION DOOR AND A/C HEATER HOUSING FOR WARPED, WORN, DAMAGED, MISSING, AND 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-305767-S12156571892008120200000) . No Replace the Recirculation Door Actuator in accordance with the service information. Then, Go To 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 this DTC as active? Yes Replace the A/C Heater Control in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

1. CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE AND CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active CONTROL CIRCUIT/PERFORMANCE or 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 «DIAGNOSTIC CODE INDEX»(ref-305859-S34530590652008120200000) for a complete list of all HVAC related DTCs. No Go To 2 .
2. INSPECT ACTUATOR AND 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»(ref-305767-S12156571892008120200000) . No Go To 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 4 . No Repair as necessary in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
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 this DTC as active? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

1. CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE AND CONTROL CIRCUIT OPEN DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active CONTROL CIRCUIT/PERFORMANCE or 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 «DIAGNOSTIC CODE INDEX»(ref-305859-S34530590652008120200000) for a complete list of all HVAC related DTCs. No Go To 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»(ref-305767-S12156571892008120200000) . No Go To 3 .
3. CHECK THE LEFT BLEND DOOR AND A/C HEATER HOUSING FOR WARPED, WORN, DAMAGED, MISSING, AND 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»(ref-305767-S12156571892008120200000) . No Replace the Left Blend Door Actuator in accordance with the Service Information. Then, Go To 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 this DTC as active? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

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-305767-S12156571892008120200000) .

1. VERIFY ALL COOLDOWN TEST PREREQUISITES WERE MET & RUN THE TEST AGAIN NOTE: The following are prerequisites of the Cooldown Test. Verify each of the following before running the test: If active, diagnose and repair DTC EVAP Temp Sensor Open or DTC EVAP Temp Sensor Shorted before proceeding. Refer to «DIAGNOSTIC CODE INDEX»(ref-305859-S34530590652008120200000) for a complete list of all HVAC related DTCs. Verify that the refrigerant system has an adequate charge. Check and repair as necessary before proceeding. 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 12°C (53°F) before proceeding. Move the vehicle to a warmer work area if necessary. Verify that the evaporator temperature is above 12°C (53°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, start the engine and actuate the Cooldown Test with the scan tool. NOTE: The Cooldown Test can take up to two minutes to run. While the test is running, the DELAY VF segment and Snowflake LED will flash. If the test fails, the VF segment and LED will continue to flash until either the vehicle is driven more than three miles or a successful test is performed. When the test is complete, the scan tool will display one or more test status messages to indicate the outcome of the test. These messages will clear from memory, so note all messages before exiting the test. Allow the test to run to completion before proceeding. Does the scan tool display any of the following status messages? Yes, Invalid Conditions For Cooldown Test, EVAP Temperature Too Low Refer to Invalid Conditions For Cooldown Test, EVAP Temperature Too Low (ATC) in this article for the diagnostic test procedure. Start from Step 2 of that diagnostic procedure. Yes, AC Pressure Too Low Refer to AC Pressure Too Low (ATC) in this article for the diagnostic test procedure. Yes, AC Pressure Too High Refer to AC Pressure Too High (ATC) in this article for the diagnostic test procedure. Yes, EVAP Temp Sensor Open Refer to EVAP Temp Sensor Open (ATC) in this article for the diagnostic test procedure. Yes, EVAP Temp Sensor Shorted Refer to EVAP Temp Sensor Shorted (ATC) in this article for the diagnostic test procedure. No Go To 2 .
2. CHECK FOR ACTIVE DTC(S) IN PCM Turn the ignition on. With the scan tool, clear all DTC's. With the scan tool, read DTC's. Does the scan tool display any PCM DTCs? Yes Diagnose and repair the DTC(s). Refer to «DIAGNOSIS AND TESTING»(ref-305761-S30618880922008120200000) . Refer to «DIAGNOSIS AND TESTING»(ref-305762-S14733707652008120200000) . Refer to «DIAGNOSIS AND TESTING»(ref-305763-S36853883682008120200000) . Run the Cooldown Test after the repair is complete. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Refer to the service information for additional Cooldown Test related diagnostic information and testing procedures. Run the Cooldown Test after the repair is complete. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

1. CHECK FOR ACTIVE DTC B1001 OR B1002 IN THE CCN Turn the ignition on. With the scan tool, read CCN DTCs. Does the scan tool display active: B1001 or B1002? Yes Diagnose and repair affected DTC(s). No Go To 2 .
2. 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»(ref-305767-S12156571892008120200000) . No Go To 3 .
3. 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»(ref-305767-S12156571892008120200000) . No Go To 4 .
4. CHECK THE A/C MODE SWITCH AND STATUS INDICATOR FUNCTION Start the engine. 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? Yes Go To 5 . No Replace the A/C Heater Control in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
5. VERIFY THAT DTC B10C1-A/C SELECT SWITCH STUCK IS STILL ACTIVE Turn the ignition on. With the scan tool, erase CCN DTCs. Turn the ignition off, wait 10 seconds, and turn the ignition on. With the scan tool, read CCN DTCs. Does the scan tool display active: B10C1-A/C SELECT SWITCH STUCK? Yes Replace the A/C Heater Control in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

1. ACTIVE DTC(S) PRESENT Turn the ignition on. With the scan tool, check for DTCs. Does the scan tool display this DTC as active? Yes Replace the A/C Heater Control in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

1. ACTIVE DTC(S) PRESENT Turn the ignition on. With the scan tool, check for DTCs. Does the scan tool display this DTC as active? Yes Go To 2 . No The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
2. CHECK VEHICLE LINE IN PCM With the scan tool compare the vehicle line that is programmed into the PCM to the vehicle line of the vehicle. Does the vehicle line programmed into the PCM match the vehicle? Yes Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the A/C Heater Control in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Replace and program the Powertrain Control Module in accordance with the service information. Ensure the PCM is replaced with the correct vehicle line PCM. Perform «PCM VERIFICATION TEST»(ref-305836-S25007108682008120200000) (GPEC) or «PCM VERIFICATION TEST»(ref-305848-S38724062282008120200000) (NGC).

1. VERIFY THE DTC IS ACTIVE Turn the ignition on. With the scan tool, read HVAC DTCs. Does the scan tool display this DTC as active? Yes Go To 2 . No If the DTC is stored, check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
2. CHECK FOR ACTIVE CAN BUS RELATED DTCS IN THE TOTALLY INTEGRATE POWER MODULE (TIPM) With the scan tool, read the Totally Integrated Power Module (TIPM) DTCs Does the scan tool display any active CAN BUS related DTCs? Yes Diagnose and repair the DTC(s). Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Go To 3 .
3. CHECK (D265) CAN INTERIOR BUS (+) CIRCUIT FOR AN OPEN Turn the ignition off. Disconnect the negative battery cable. Disconnect the A/C Heater Control C1 harness connector. Disconnect the Totally Integrated Power Module (TIPM) C7 harness connector. Measure the resistance of the (D265) CAN Interior Bus (+) circuit between the Totally Integrated Power Module (TIPM) C7 harness connector and the A/C Heater Control C1 harness connector. Is the resistance below 2.0 ohms? Yes Go To 4 . No Repair the (D265) CAN Interior Bus (+) circuit for an open. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
4. CHECK (D264) CAN INTERIOR BUS (-) CIRCUIT FOR AN OPEN Measure the resistance of the (D264) CAN Interior Bus (-) circuit between the Totally Integrated Power Module (TIPM) C7 connector and the A/C Heater Control C1 harness connector. Is the resistance below 2.0 ohms? Yes Go To 5 . No Repair the (D264) CAN Interior Bus (-) circuit for an open. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
5. CHECK (D265) CAN C INTERIOR BUS (+) CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (D265) CAN C Interior Bus (125K) (+) circuit in the A/C Heater Control C1 harness connector. Is the resistance above 1000.0 ohms? Yes Go To 6 . No Repair the (D265) CAN C Interior Bus (+) circuit for a short to ground. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
6. CHECK (D264) CAN C INTERIOR BUS (-) CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (D264) CAN C Interior Bus (125K) (-) circuit in the A/C Heater Control C1 harness connector. Is the resistance above 1000.0 ohms? Yes Go To 7 . No Repair the (D264) CAN C Interior Bus (-) circuit for a short to ground. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
7. CHECK (D265) CAN C INTERIOR BUS (+) CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition on. Measure the voltage of the (D265) CAN C Interior Bus (125K) (+) circuit in the A/C Heater Control C1 harness connector. Is the voltage below 0.2 volts? Yes Go To 8 . No Repair the (D265) CAN C Interior Bus (+) circuit for a short to voltage. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .
8. CHECK (D264) CAN C INTERIOR BUS (-) CIRCUIT FOR A SHORT TO VOLTAGE Measure the voltage of the (D264) CAN C Interior Bus (125K) (-) circuit in the A/C Heater Control C1 harness connector. Is the voltage below 0.2 volts? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) . No Repair the (D264) CAN C Interior Bus (-) circuit for a short to voltage. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.

1. 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 step 2 . A/C System Performance Test Go To step 2 . Mode Switch, Door Actuator Ckt, & Auxiliary Coolant Pump Ckt Test Go To step 3 . Actuator DTC Detection Test Go To step 4 . Actuator Calibration Test Go To step 5 .
2. 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. Yes, Refrigerant Temperature Sensor Error Refer to B1079-CLIMATE CONTROL COOL DOWN TEST EXCESSIVE TIME (ATC & MTC) for the diagnostic test procedure. Yes, DTC Set During Routine - Test Not Passed Refer to B1079-CLIMATE CONTROL COOL DOWN TEST EXCESSIVE TIME (ATC & MTC) for the diagnostic test procedure. No As necessary, either Go To step 3 , step 4 , or step 5 or perform the BODY VERIFICATION TEST - VER 1. See «STANDARD PROCEDURE»(ref-305767-S37826466292008120200000) . See «STANDARD PROCEDURE»(ref-305775-S30549721972008120200000) .
3. 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 affected DTC(s). No As necessary, either Go To step 4 or step 5 or perform the BODY VERIFICATION TEST - VER 1. See «STANDARD PROCEDURE»(ref-305767-S37826466292008120200000) . See «STANDARD PROCEDURE»(ref-305775-S30549721972008120200000) .
4. 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 «DIAGNOSTIC CODE INDEX»(ref-305859-S34530590652008120200000) for a complete list of all HVAC related DTCs. No As necessary, either Go To step 5 or perform the BODY VERIFICATION TEST - VER 1. See «STANDARD PROCEDURE»(ref-305767-S37826466292008120200000) . See «STANDARD PROCEDURE»(ref-305775-S30549721972008120200000) .
5. 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 affected DTC(s). No No problem found. Perform «BODY VERIFICATION TEST - VER 1»(ref-305767-S12156571892008120200000) .