HVAC Systems - Electrical Diagnostics: Other Chrysler Crossfire I

When Monitored and Set Condition

1. When Monitored: With the ignition on.
2. Set Condition: The A/C Heater Control Module reports an abnormally high or low voltage that is detected by the Instrument Cluster on the Ambient Temperature Sensor Signal circuit.

For a complete HVAC Circuit Diagram, (Refer to HEATING & AIR CONDITIONING - SCHEMATICS AND DIAGRAMS) .

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Scheme 11

1. 1) READ AMBIENT TEMPERATURE SENSOR VOLTAGE WITH DRB III(R) Turn the ignition on. With the DRB III(R), read the Ambient Temperature Sensor voltage. Does the DRB III(R) display AMBIENT TEMP: 5.0 VOLTS or greater? Yes Go to step 2) . No Go to step 6) .
2. 2) MEASURE THE VOLTAGE OF THE AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the Ambient Temperature Sensor harness connector. NOTE: Check connector - Clean/repair as necessary. Turn the ignition on. Measure the voltage of the Ambient Temperature Sensor Signal circuit at the Ambient Temperature Sensor harness connector. Is the voltage above 5.5 volts? Yes Repair the Ambient Temperature Sensor Signal circuit for a short to voltage. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 3) .
3. 3) READ AMBIENT TEMPERATURE SENSOR VOLTAGE WITH DRB III(R) Turn the ignition off. Connect a jumper wire between the Ambient Temperature Sensor Signal circuit and the Sensor Ground circuit. Turn the ignition on. With the DRB III(R), read the Ambient Temperature Sensor voltage. Does the DRB III(R) display AMBIENT TEMP: 4.5 VOLTS or greater? Yes Go to step 4) . No Replace the Ambient Temperature Sensor. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/AMBIENT TEMP SENSOR - REMOVAL)»(ref-250627-S20357161682007031500000) Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
4. 4) MEASURE THE RESISTANCE OF THE AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the Instrument Cluster C1 harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance of the Ambient Temperature Sensor Signal circuit from the Instrument Cluster harness connector to the Ambient Temperature Sensor harness connector. Is the resistance below 5.0 ohms? Yes Go to step 5) . No Repair the Ambient Temperature Sensor Signal circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
5. 5) MEASURE THE RESISTANCE OF THE SENSOR GROUND CIRCUIT With the ignition off. Measure the resistance of the Sensor Ground circuit from the Instrument Cluster harness connector to the Ambient Temperature Sensor harness connector. Is the resistance below 5.0 ohms? Yes Replace the Instrument Cluster. «(Refer to ELECTRICAL/INSTRUMENT CLUSTER - REMOVAL)»(ref-250619-S04395837002007031500000) Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Repair the Sensor Ground circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
6. 6) READ AMBIENT TEMPERATURE SENSOR VOLTAGE WITH DRB III(R) Turn the ignition off. Disconnect the Ambient Temperature Sensor harness connector. NOTE: Check connector - Clean/repair as necessary. Turn the ignition on. With the DRB III(R), read the Ambient Temperature Sensor voltage. Does the DRB III(R) display AMBIENT TEMP: 4.5 VOLTS or greater? Yes Go to step 7) . No Go to step 9) .
7. 7) READ A/C HEATER CONTROL MODULE DTC'S WITH DRB III(R) Turn the ignition off. Reconnect the Ambient Temperature Sensor connector. Turn the ignition on. With the DRB III(R), read A/C Heater Control Module DTC's. Wait two minutes. With the DRB III(R), read A/C Heater Control Module DTC's. Does the DRB III(R) display Ambient Temperature Sensor Failure DTC? Yes Replace the Ambient Temperature Sensor. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/AMBIENT TEMP SENSOR - REMOVAL)»(ref-250627-S20357161682007031500000) Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 8) .
8. 8) READ A/C HEATER CONTROL MODULE DTC'S WITH DRB III(R) Ensure the Ambient Temperature Sensor is connected at this time. Start the engine. Turn the A/C system on and run for at least five minutes. With the DRB III(R), read A/C Heater Control Module DTC's. Does the DRB III(R) display Ambient Temperature Sensor Failure DTC? Yes Replace the Ambient Temperature Sensor. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
9. 9) MEASURE THE RESISTANCE BETWEEN GROUND AND THE AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the Instrument Cluster C1 harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance between ground and the Ambient Temperature Signal circuit. Is the resistance below 1000.0 ohms? Yes Repair the Ambient Temperature Sensor Signal circuit for a short to ground. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 10) .
10. 10) MEASURE THE RESISTANCE FROM THE AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT TO THE SENSOR GROUND CIRCUIT With the ignition off. Measure the resistance from the Ambient Temperature Sensor Signal circuit to the Sensor Ground circuit at the Ambient Temperature Sensor connector. Is the resistance below 1000.0 ohms? Yes Repair the Ambient Temperature Sensor Signal circuit for a short to the Sensor Ground circuit. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Replace the Instrument Cluster. «(Refer to ELECTRICAL/INSTRUMENT CLUSTER - REMOVAL)»(ref-250619-S04395837002007031500000) Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .

Scheme 12

1. When Monitored: With the ignition on.
2. Set Condition: The A/C Heater Control Module detects an abnormally high or low voltage on the Left Heater Core Temperature Sensor Signal circuit.

For a complete HVAC Circuit Diagram, (Refer to HEATING & AIR CONDITIONING - SCHEMATICS AND DIAGRAMS) .

Scheme 13

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Scheme 18

1. 1) READ LEFT HEATER CORE TEMPERATURE SENSOR VOLTAGE WITH DRB III(R) Turn the ignition on. With the DRB III(R), read the Left Heater Core Temperature Sensor voltage. Does the DRB III(R) display LEFT HEATER CORE TEMP: 5.0 VOLTS or greater? Yes Go to step 2) . No Go to step 6) .
2. 2) MEASURE THE VOLTAGE OF THE LEFT HEATER CORE TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the Heater Core Temperature Sensor harness connector. NOTE: Check connector - Clean/repair as necessary. Turn the ignition on. Measure the voltage of the Left Heater Core Temperature Sensor Signal circuit at the Heater Core Temperature Sensor harness connector. Is the voltage above 5.5 volts? Yes Repair the Left Heater Core Temperature Sensor Signal circuit for a short to voltage. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 3) .
3. 3) READ LEFT HEATER CORE TEMPERATURE SENSOR VOLTAGE WITH DRB III Turn the ignition off. Connect a jumper wire between the Left Heater Core Temperature Sensor Signal circuit and the Sensor Ground circuit. Turn the ignition on. With the DRB III(R), read the Left Heater Core Temperature Sensor voltage. Does the DRB III(R) display LEFT HEATER CORE TEMP: 4.5 VOLTS or greater? Yes Go to step 4) . No Replace the Heater Core Temperature Sensor. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/TEMPERATURE SENSOR - REMOVAL)»(ref-250627-S36285628622007031500000) Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
4. 4) MEASURE THE RESISTANCE OF THE LEFT HEATER CORE TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the A/C Heater Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance of the Left Heater Core Temperature Sensor Signal circuit from the A/C Heater Control Module harness connector to the Heater Core Temperature Sensor harness connector. Is the resistance below 5.0 ohms? Yes Go to step 5) . No Repair the Left Heater Core Temperature Sensor Signal circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
5. 5) MEASURE THE RESISTANCE OF THE SENSOR GROUND CIRCUIT With the ignition off. Measure the resistance of the Sensor Ground circuit from the A/C Heater Control Module harness connector to the Heater Core Temperature Sensor harness connector. Is the resistance below 5.0 ohms? Yes Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Repair the Sensor Ground circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
6. 6) READ LEFT HEATER CORE TEMPERATURE SENSOR VOLTAGE WITH DRB III(R) Turn the ignition off. Disconnect the Heater Core Temperature Sensor harness connector. NOTE: Check connector - Clean/repair as necessary. Turn the ignition on. With the DRB III(R), read the Left Heater Core Temperature Sensor voltage. Does the DRB III(R) display LEFT HEATER CORE TEMP: 4.5 VOLTS or greater? Yes Go to step 7) . No Go to step 9) .
7. 7) READ A/C HEATER CONTROL MODULE DTC'S WITH DRB III(R) Turn the ignition off. Reconnect the Heater Core Temperature Sensor connector. Turn the ignition on. With the DRB III(R), read A/C Heater Control Module DTC's. Wait two minutes. With the DRB III(R), read A/C Heater Control Module DTC's. Does the DRB III(R) display Left Heater Core Temperature Sensor Failure DTC? Yes Replace the Heater Core Temperature Sensor. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/TEMPERATURE SENSOR - REMOVAL)»(ref-250627-S36285628622007031500000) Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 8) .
8. 8) READ A/C HEATER CONTROL MODULE DTC'S WITH DRB III(R) Ensure the Heater Core Temperature Sensor is connected at this time. Start the engine. Turn the A/C system on. With the DRB III(R), read A/C Heater Control Module DTC's. Does the DRB III(R) display Left Heater Core Temperature Sensor Failure DTC? Yes Replace the Heater Core Temperature Sensor. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/TEMPERATURE SENSOR - REMOVAL)»(ref-250627-S36285628622007031500000) Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
9. 9) MEASURE THE RESISTANCE BETWEEN GROUND AND THE LEFT HEATER CORE TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the A/C Heater Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance between ground and the Left Heater Core Temperature Signal circuit. Is the resistance below 1000.0 ohms? Yes Repair the Left Heater Core Temperature Sensor Signal circuit for a short to ground. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 10) .
10. 10) MEASURE THE RESISTANCE FROM THE LEFT HEATER CORE TEMPERATURE SENSOR SIGNAL CIRCUIT TO THE SENSOR GROUND CIRCUIT With the ignition off. Measure the resistance from the Left Heater Core Temperature Sensor Signal circuit to the Sensor Ground circuit at the Heater Core Temperature Sensor connector. Is the resistance below 1000.0 ohms? Yes Repair the Left Heater Core Temperature Sensor Signal circuit for a short to the Sensor Ground circuit. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .

Scheme 19

1. When Monitored: With the ignition on.
2. Set Condition: The A/C Heater Control Module detects an abnormally high or low voltage on the Right Heater Core Temperature Sensor Signal circuit.

For a complete HVAC Circuit Diagram, (Refer to HEATING & AIR CONDITIONING - SCHEMATICS AND DIAGRAMS) .

Scheme 20

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1. 1) READ RIGHT HEATER CORE TEMPERATURE SENSOR VOLTAGE WITH DRB III(R) Turn the ignition on. With the DRB III(R), read the Right Heater Core Temperature Sensor voltage. Does the DRB III(R) display Right HEATER CORE TEMP: 5.0 VOLTS or greater? Yes Go to step 2) . No Go to step 6) .
2. 2) MEASURE THE VOLTAGE OF THE RIGHT HEATER CORE TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the Heater Core Temperature Sensor harness connector. NOTE: Check connector - Clean/repair as necessary. Turn the ignition on. Measure the voltage of the Right Heater Core Temperature Sensor Signal circuit at the Heater Core Temperature Sensor harness connector. Is the voltage above 5.5 volts? Yes Repair the Right Heater Core Temperature Sensor Signal circuit for a short to voltage. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 3) .
3. 3) READ RIGHT HEATER CORE TEMPERATURE SENSOR VOLTAGE WITH DRB III(R) Turn the ignition off. Connect a jumper wire between the Right Heater Core Temperature Sensor Signal circuit and the Sensor Ground circuit. Turn the ignition on. With the DRB III(R), read the Right Heater Core Temperature Sensor voltage. Does the DRB III(R) display RIGHT HEATER CORE TEMP: 4.5 VOLTS or greater? Yes Go to step 4) . No Replace the Heater Core Temperature Sensor. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/TEMPERATURE SENSOR - REMOVAL)»(ref-250627-S36285628622007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
4. 4) MEASURE THE RESISTANCE OF THE RIGHT HEATER CORE TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the A/C Heater Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance of the Right Heater Core Temperature Sensor Signal circuit from the A/C Heater Control Module harness connector to the Heater Core Temperature Sensor harness connector. Is the resistance below 5.0 ohms? Yes Go to step 5) . No Repair the Right Heater Core Temperature Sensor Signal circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
5. 5) MEASURE THE RESISTANCE OF THE SENSOR GROUND CIRCUIT With the ignition off. Measure the resistance of the Sensor Ground circuit from the A/C Heater Control Module harness connector to the Heater Core Temperature Sensor harness connector. Is the resistance below 5.0 ohms? Yes Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Repair the Sensor Ground circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
6. 6) READ RIGHT HEATER CORE TEMPERATURE SENSOR VOLTAGE WITH DRB III(R) Turn the ignition off. Disconnect the Heater Core Temperature Sensor harness connector. NOTE: Check connector - Clean/repair as necessary. Turn the ignition on. With the DRB III(R), read the Right Heater Core Temperature Sensor voltage. Does the DRB III(R) display RIGHT HEATER CORE TEMP: 4.5 VOLTS or greater? Yes Go to step 7) . No Go to step 9) .
7. 7) READ A/C HEATER CONTROL MODULE DTC'S WITH DRB III(R) Turn the ignition off. Reconnect the Heater Core Temperature Sensor connector. Turn the ignition on. With the DRB III(R), read A/C Heater Control Module DTC's. Wait two minutes. With the DRB III(R), read A/C Heater Control Module DTC's. Does the DRB III(R) display Right Heater Core Temperature Sensor Failure DTC? Yes Replace the Heater Core Temperature Sensor. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/TEMPERATURE SENSOR - REMOVAL)»(ref-250627-S36285628622007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 8) .
8. 8) READ A/C HEATER CONTROL MODULE DTC'S WITH DRB III(R) Ensure the Heater Core Temperature Sensor is connected at this time. Start the engine. Turn the A/C system on. With the DRB III(R), read A/C Heater Control Module DTC's. Does the DRB III(R) display Right Heater Core Temperature Sensor Failure DTC? Yes Replace the Heater Core Temperature Sensor. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/TEMPERATURE SENSOR - REMOVAL)»(ref-250627-S36285628622007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
9. 9) MEASURE THE RESISTANCE BETWEEN GROUND AND THE RIGHT HEATER CORE TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the A/C Heater Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance between ground and the Right Heater Core Temperature Signal circuit. Is the resistance below 1000.0 ohms? Yes Repair the Right Heater Core Temperature Sensor Signal circuit for a short to ground. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 10) .
10. 10) MEASURE THE RESISTANCE FROM THE RIGHT HEATER CORE TEMPERATURE SENSOR SIGNAL CIRCUIT TO THE SENSOR GROUND CIRCUIT With the ignition off. Measure the resistance from the Right Heater Core Temperature Sensor Signal circuit to the Sensor Ground circuit at the Heater Core Temperature Sensor connector. Is the resistance below 1000.0 ohms? Yes Repair the Right Heater Core Temperature Sensor Signal circuit for a short to the Sensor Ground circuit. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .

Scheme 25

1. When Monitored: With the ignition on.
2. Set Condition: The A/C Heater Control Module detects an abnormally high or low voltage on the Evaporator Temperature Sensor Signal circuit.

For a complete HVAC Circuit Diagram, (Refer to HEATING & AIR CONDITIONING - SCHEMATICS AND DIAGRAMS) .

Scheme 26

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Scheme 31

1. 1) READ EVAPORATOR TEMPERATURE SENSOR VOLTAGE WITH DRB III(R) Turn the ignition on. With the DRB III(R), read the Evaporator Temperature Sensor voltage. Does the DRB III(R) display EVAP TEMP: 5.0 VOLTS or greater? Yes Go to step 2) . No Go to step 6) .
2. 2) MEASURE THE VOLTAGE OF THE EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the Evaporator Temperature Sensor harness connector. NOTE: Check connector - Clean/repair as necessary. Turn the ignition on. Measure the voltage of the Evaporator Temperature Sensor Signal circuit at the Evaporator Temperature Sensor harness connector. Is the voltage above 5.5 volts? Yes Repair the Evaporator Temperature Sensor Signal circuit for a short to voltage. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 3) .
3. 3) READ EVAPORATOR TEMPERATURE SENSOR VOLTAGE WITH DRB III(R) Turn the ignition off. Connect a jumper wire between the Evaporator Temperature Sensor Signal circuit and the Sensor Ground circuit. Turn the ignition on. With the DRB III(R), read the Evaporator Temperature Sensor voltage. Does the DRB III(R) display EVAP TEMP: 4.5 VOLTS or greater? Yes Go to step 4) . No Replace the Evaporator Temperature Sensor. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/EVAPORATOR TEMPERATURE SENSOR - REMOVAL)»(ref-250627-S31879564582007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
4. 4) MEASURE THE RESISTANCE OF THE EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the A/C Heater Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance of the Evaporator Temperature Sensor Signal circuit from the A/C Heater Control Module harness connector to the Evaporator Temperature Sensor harness connector. Is the resistance below 5.0 ohms? Yes Go to step 5) . No Repair the Evaporator Temperature Sensor Signal circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
5. 5) MEASURE THE RESISTANCE OF THE SENSOR GROUND CIRCUIT With the ignition off. Measure the resistance of the Sensor Ground circuit from the A/C Heater Control Module harness connector to the Evaporator Temperature Sensor harness connector. Is the resistance below 5.0 ohms? Yes Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Repair the Sensor Ground circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
6. 6) READ EVAPORATOR TEMPERATURE SENSOR VOLTAGE WITH DRB III(R) Turn the ignition off. Disconnect the Evaporator Temperature Sensor harness connector. NOTE: Check connector - Clean/repair as necessary. Turn the ignition on. With the DRB III(R), read the Evaporator Temperature Sensor voltage. Does the DRB III(R) display EVAP TEMP: 4.5 VOLTS or greater? Yes Go to step 7) . No Go to step 9) .
7. 7) READ A/C HEATER CONTROL MODULE DTC'S WITH DRB III(R) Turn the ignition off. Reconnect the Evaporator Temperature Sensor connector. Turn the ignition on. With the DRB III(R), read A/C Heater Control Module DTC's. Wait two minutes. With the DRB III(R), read A/C Heater Control Module DTC's. Does the DRB III(R) display Evaporator Temperature Sensor Failure DTC? Yes Replace the Evaporator Temperature Sensor. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/EVAPORATOR TEMPERATURE SENSOR - REMOVAL)»(ref-250627-S31879564582007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 8) .
8. 8) READ A/C HEATER CONTROL MODULE DTC'S WITH DRB III(R) Ensure the Evaporator Temperature Sensor is connected at this time. Start the engine. Turn the A/C system on and run for at least five minutes (so water will form on the Evaporator Temperature Sensor). With the DRB III(R), read A/C Heater Control Module DTC's. Does the DRB III(R) display an Evaporator Temperature Sensor Failure DTC? Yes Replace the Evaporator Temperature Sensor. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/EVAPORATOR TEMPERATURE SENSOR - REMOVAL)»(ref-250627-S31879564582007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
9. 9) MEASURE THE RESISTANCE BETWEEN GROUND AND THE EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the A/C Heater Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance between ground and the Evaporator Temperature Signal circuit. Is the resistance below 1000.0 ohms? Yes Repair the Evaporator Temperature Sensor Signal circuit for a short to ground. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 10) .
10. 10) MEASURE THE RESISTANCE FROM THE EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT TO THE SENSOR GROUND CIRCUIT With the ignition off. Measure the resistance from the Evaporator Temperature Sensor Signal circuit to the Sensor Ground circuit at the Evaporator Temperature Sensor harness connector. Is the resistance below 1000.0 ohms? Yes Repair the Evaporator Temperature Sensor Signal circuit for a short to the Sensor Ground circuit. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .

Scheme 32

1. When Monitored: With the ignition on.
2. Set Condition: The A/C Heater Control Module reports an abnormally high or low voltage that is detected by the Instrument Cluster. The abnormal condition is at the Powertrain Control Module (PCM) on the Engine Coolant Temperature Sensor Signal circuit. The abnormal condition is communicated from the PCM to the Instrument Cluster by the CAN bus.

For a complete HVAC Circuit Diagram, (Refer to HEATING & AIR CONDITIONING - SCHEMATICS AND DIAGRAMS) .

Scheme 33

Scheme 34

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Scheme 38

1. 1) READ ENGINE COOLANT TEMPERATURE SENSOR VOLTAGE WITH DRB III(R) Turn the ignition on. With the DRB III(R), read the Engine Coolant Temperature Sensor voltage. Does the DRB III(R) display ENGINE COOLANT TEMP: 5.0 VOLTS or greater? Yes Go to step 2) . No Go to step 6) .
2. 2) MEASURE THE VOLTAGE OF THE ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the Engine Coolant Temperature Sensor harness connector. NOTE: Check connector - Clean/repair as necessary. Turn the ignition on. Measure the voltage of the Engine Coolant Temperature Sensor Signal Circuit at the Engine Coolant Temperature Sensor harness connector. Is the voltage above 5.5 volts? Yes Repair the Engine Coolant Temperature Sensor Signal circuit for a short to voltage. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 3) .
3. 3) READ ENGINE COOLANT TEMPERATURE SENSOR VOLTAGE WITH DRB III(R) Turn the ignition off. Connect a jumper wire between the Engine Coolant Temperature Sensor Signal circuit and the Sensor Ground circuit. Turn the ignition on. With the DRB III(R), read the Engine Coolant Temperature Sensor voltage. Does the DRB III(R) display ENGINE COOLANT TEMP: 4.5 VOLTS or greater? Yes Go to step 4) . No Replace the Engine Coolant Temperature Sensor. «(Refer to COOLING/ENGINE/ENGINE COOLANT TEMP SENSOR - REMOVAL)»(ref-250623-S21208723432007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
4. 4) MEASURE THE RESISTANCE OF THE ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the Powertrain Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance of the Engine Coolant Temperature Sensor Signal circuit from the Powertrain Control Module harness connector to the Engine Coolant Temperature Sensor harness connector. Is the resistance below 5.0 ohms? Yes Go to step 5) . No Repair the Engine Coolant Temperature Sensor Signal circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
5. 5) MEASURE THE RESISTANCE OF THE SENSOR GROUND CIRCUIT With the ignition off. Measure the resistance of the Sensor Ground circuit from the Powertrain Control Module harness connector to the Engine Coolant Temperature Sensor harness connector. Is the resistance below 5.0 ohms? Yes Replace the Powertrain Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-250625-S17957216692007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Repair the Sensor Ground circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
6. 6) READ ENGINE COOLANT TEMPERATURE SENSOR VOLTAGE WITH DRB III(R) Turn the ignition off. Disconnect the Engine Coolant Temperature Sensor harness connector. NOTE: Check connector - Clean/repair as necessary. Turn the ignition on. With the DRB III(R), read the Engine Coolant Temperature Sensor voltage. Does the DRB III(R) display ENGINE COOLANT TEMP: 4.5 VOLTS or greater? Yes Go to step 7) . No Go to step 9) .
7. 7) READ A/C HEATER CONTROL MODULE DTC'S WITH DRB III(R) Turn the ignition off. Reconnect the Engine Coolant Temperature Sensor connector. Turn the ignition on. With the DRB III(R), read A/C Heater Control Module DTC's. Wait two minutes. With the DRB III(R), read A/C Heater Control Module DTC's. Does the DRB III(R) display an Engine Coolant Temperature Sensor Failure DTC? Yes Replace the Engine Coolant Temperature Sensor. «(Refer to COOLING/ENGINE/ENGINE COOLANT TEMP SENSOR - REMOVAL)»(ref-250623-S21208723432007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 8) .
8. 8) READ A/C HEATER CONTROL MODULE DTC'S WITH DRB III(R) Ensure the Engine Coolant Temperature Sensor is connected at this time. Start the engine. Turn the A/C system on and run for at least five minutes. With the DRB III(R), read A/C Heater Control Module DTC's. Does the DRB III(R) display an Engine Coolant Temperature Sensor Failure DTC? Yes Replace the Engine Coolant Temperature Sensor. «(Refer to COOLING/ENGINE/ENGINE COOLANT TEMP SENSOR - REMOVAL)»(ref-250623-S21208723432007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
9. 9) MEASURE THE RESISTANCE BETWEEN GROUND AND THE ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the Powertrain Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance between ground and the Engine Coolant Temperature Signal circuit at the Powertrain Control Module connector. Is the resistance below 1000.0 ohms? Yes Repair the Engine Coolant Temperature Sensor Signal circuit for a short to ground. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 10) .
10. 10) MEASURE THE RESISTANCE FROM THE ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT TO THE SENSOR GROUND CIRCUIT With the ignition off. Measure the resistance from the Engine Coolant Temperature Sensor Signal circuit to the Sensor Ground circuit at the Engine Coolant Temperature Sensor harness connector. Is the resistance below 1000.0 ohms? Yes Repair the Engine Coolant Temperature Sensor Signal circuit for a short to the Sensor Ground circuit. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Replace the Powertrain Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-250625-S17957216692007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .

Scheme 39

1. When Monitored: Engine Running with the A/C on.
2. Set Condition: The A/C Heater Control Module detects an abnormally high or low voltage on the A/C Pressure Sensor Signal circuit.

For a complete HVAC Circuit Diagram, (Refer to HEATING & AIR CONDITIONING - SCHEMATICS AND DIAGRAMS) .

Scheme 40

Scheme 41

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Scheme 46

Scheme 47

Scheme 48

Scheme 49

1. 1) READ A/C PRESSURE SENSOR VOLTAGE WITH DRB III(R) NOTE: Ensure the A/C refrigerant system is properly charged to specifications. Turn the ignition on. With the DRB III(R), read the A/C Pressure Sensor voltage. Is the voltage above 4.5 volts? Yes Go to step 2) . No Go to step 7) .
2. 2) MEASURE THE RESISTANCE FROM THE A/C PRESSURE SENSOR SIGNAL CIRCUIT TO THE 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the A/C Pressure Sensor harness connector. NOTE: Check connector - Clean/repair as necessary. Disconnect the A/C Heater Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance from the A/C Pressure Sensor Signal circuit to the 5-Volt supply circuit at the A/C Pressure Sensor harness connector. Is the resistance below 5.0 ohms? Yes Repair the A/C Pressure Sensor Signal circuit for a short to the 5-Volt Supply circuit. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 3) .
3. 3) MEASURE THE VOLTAGE ON THE A/C PRESSURE SENSOR SIGNAL CIRCUIT Turn the ignition on. Measure the voltage on the A/C Pressure Sensor Signal circuit at the A/C Pressure Sensor harness connector. Is the voltage above 5.2 volts? Yes Repair the A/C Pressure Sensor Signal circuit for a short to battery voltage. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 4) .
4. 4) MONITOR A/C PRESSURE SENSOR VOLTAGE WITH DRB III(R) Turn the ignition off. Connect a jumper wire between the A/C Pressure Sensor Signal circuit and the Sensor ground circuit. Turn the ignition on. With the DRB III(R), monitor the A/C Pressure Sensor voltage. Is the voltage below 1.0 volt? Yes Replace the A/C Pressure Sensor. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/A/C PRESSURE TRANSDUCER - REMOVAL)»(ref-250627-S13899584352007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 5) .
5. 5) MEASURE THE RESISTANCE OF THE A/C PRESSURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Measure the resistance of the A/C Pressure Sensor Signal circuit from the A/C Heater Control Module harness connector to the A/C Pressure Sensor harness connector. Is the resistance below 5.0 ohms? Yes Go to step 6) . No Repair the A/C Pressure Sensor Signal circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
6. 6) MEASURE THE RESISTANCE BETWEEN GROUND AND THE A/C PRESSURE SENSOR GROUND CIRCUIT With the ignition off. Measure the resistance between ground and the A/C Pressure Sensor Ground circuit at the A/C Pressure Sensor harness connector. Is the resistance below 30 ohms? Yes Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Repair the A/C Pressure Sensor ground circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
7. 7) READ A/C PRESSURE SENSOR VOLTAGE WITH DRB III(R) With the ignition on. With the DRB III(R), read the A/C Pressure Sensor voltage. Is the voltage below 0.5 of a volt? Yes Go to step 8) . No The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
8. 8) MEASURE THE VOLTAGE OF THE 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the A/C Pressure Sensor harness connector. NOTE: Check connector - Clean/repair as necessary. Turn the ignition on. Measure the voltage of the 5-Volt Supply circuit at the A/C Pressure Sensor harness connector. Is the voltage between 4.5 and 5.0 volts? Yes Go to step 9) . No Go to step 12) .
9. 9) MONITOR A/C PRESSURE SENSOR VOLTAGE WITH DRB III(R) With the ignition on. With the DRB III(R), monitor the A/C Pressure Sensor voltage. Is the voltage above 0.5 of a volt? Yes Replace the A/C Pressure Sensor. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/A/C PRESSURE TRANSDUCER - REMOVAL)»(ref-250627-S13899584352007031500000) Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 10) .
10. 10) MEASURE THE RESISTANCE BETWEEN GROUND AND THE A/C PRESSURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the A/C Heater Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance between ground and the A/C Pressure Sensor Signal circuit in the A/C Pressure Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the A/C Pressure Sensor Signal circuit for a short to ground. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 11) .
11. 11) MEASURE THE RESISTANCE FROM THE A/C PRESSURE SENSOR SIGNAL CIRCUIT TO THE SENSOR GROUND CIRCUIT With the ignition off. Measure the resistance from the A/C Pressure Sensor Signal circuit to the Sensor Ground circuit at the A/C Pressure Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the A/C Pressure Sensor Signal circuit for a short to the Sensor Ground circuit. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
12. 12) MEASURE THE RESISTANCE BETWEEN GROUND AND THE A/C PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the A/C Heater Control Module harness connector. Measure the resistance between ground and the 5-Volt Supply circuit at the A/C Pressure Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the 5-Volt Supply circuit for a short to ground. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Go to step 13) .
13. 13) MEASURE THE RESISTANCE OF THE A/C PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT With the ignition off. Measure the resistance of the 5-Volt Supply circuit from the A/C Pressure Sensor harness connector to the A/C Heater Control Module harness connector. Is the resistance below 5.0 ohms? Yes Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Repair the A/C Pressure Sensor 5-Volt Supply circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .

Scheme 50

1. When Monitored: With the ignition on.
2. Set Condition: The A/C Heater Control Module detects an abnormal condition on the Coolant Circulation Pump Control circuit.

For a complete HVAC Circuit Diagram, (Refer to HEATING & AIR CONDITIONING - SCHEMATICS AND DIAGRAMS) .

Scheme 51

Scheme 52

Scheme 53

1. 1) MEASURE COOLANT CIRCULATION PUMP VOLTAGE NOTE: Inspect Fuse 15 located in the Underhood Accessory Fuse Block. If the fuse is open, repair the cause of the open fuse before continuing. Turn the ignition off. Disconnect the Coolant Circulation Pump harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the voltage of the Fused B(+) circuit at the Coolant Circulation Pump harness connector. Is the voltage above 10 volts? Yes Go to step 2) . No Repair the Coolant Circulation Pump Fused B(+) circuit. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
2. 2) MEASURE THE VOLTAGE OF THE COOLANT CIRCULATION PUMP CONTROL CIRCUIT With the ignition off. Disconnect the A/C Heater Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Connect a jumper wire between the terminals in the Coolant Circulation Pump harness connector. Measure the voltage of the Coolant Circulation Pump Control circuit at the A/C Heater Control Module harness connector. Is the voltage above 10 volts? Yes Go to step 3) . No Repair the Coolant Circulation Pump Control circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
3. 3) MEASURE THE VOLTAGE OF THE COOLANT CIRCULATION PUMP CONTROL CIRCUIT With the ignition off. Reconnect the Coolant Circulation Pump harness connector. Measure the voltage of the Coolant Circulation Pump Control circuit at the A/C Heater Control Module harness connector. Is the voltage above 10 volts? Yes Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Replace the Coolant Circulation Pump. «(Refer to HEATING & AIR CONDITIONING/PLUMBING/ELECTRIC COOLANT PUMP - REMOVAL)»(ref-250627-S19434599992007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .

Scheme 54

1. When Monitored: With the ignition on.
2. Set Condition: The A/C Heater Control Module detects an abnormal condition on the Left Coolant Circulation Valve Control circuit.

For a complete HVAC Circuit Diagram, (Refer to HEATING & AIR CONDITIONING - SCHEMATICS AND DIAGRAMS) .

Scheme 55

Scheme 56

Scheme 57

1. 1) MEASURE COOLANT CIRCULATION VALVE VOLTAGE NOTE: Inspect Fuse 15 located in the Underhood Accessory Fuse Block. If the fuse is open, repair the cause of the open fuse before continuing. Turn the ignition off. Disconnect the Coolant Circulation Valve harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the voltage of the Fused B(+) circuit at the Coolant Circulation Valve harness connector. Is the voltage above 10 volts? Yes Go to step 2) . No Repair the Coolant Circulation Valve Fused B(+) circuit. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
2. 2) MEASURE THE VOLTAGE OF THE LEFT COOLANT CIRCULATION VALVE CONTROL CIRCUIT With the ignition off. Disconnect the A/C Heater Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Connect a jumper wire between the Left Coolant Circulation Valve terminals in the Coolant Circulation Valve harness connector. Measure the voltage of the Left Coolant Circulation Valve Control circuit at the A/C Heater Control Module harness connector. Is the voltage above 10 volts? Yes Go to step 3) . No Repair the Left Coolant Circulation Valve Control circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
3. 3) MEASURE THE VOLTAGE OF THE LEFT COOLANT CIRCULATION VALVE CONTROL CIRCUIT With the ignition off. Reconnect the Coolant Circulation Valve harness connector. Measure the voltage of the Left Coolant Circulation Valve Control circuit at the A/C Heater Control Module harness connector. Is the voltage above 10 volts? Yes Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Replace the Coolant Circulation Valve. «(Refer to HEATING & AIR CONDITIONING/PLUMBING/A/C EXPANSION VALVE - REMOVAL)»(ref-250627-S39679121872007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .

Scheme 58

1. When Monitored: With the ignition on.
2. Set Condition: The A/C Heater Control Module detects an abnormal condition on the Right Coolant Circulation Valve Control circuit.

For a complete HVAC Circuit Diagram, (Refer to HEATING & AIR CONDITIONING - SCHEMATICS AND DIAGRAMS) .

Scheme 59

Scheme 60

1. 1) MEASURE COOLANT CIRCULATION VALVE VOLTAGE NOTE: Inspect Fuse 15 located in the Underhood Accessory Fuse Block. If the fuse is open, repair the cause of the open fuse before continuing. Turn the ignition off. Disconnect the Coolant Circulation Valve harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the voltage of the Fused B(+) circuit at the Coolant Circulation Valve harness connector. Is the voltage above 10 volts? Yes Go to step 2) . No Repair the Coolant Circulation Valve Fused B(+) circuit. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
2. 2) MEASURE THE VOLTAGE OF THE RIGHT COOLANT CIRCULATION VALVE CONTROL CIRCUIT With the ignition off. Disconnect the A/C Heater Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Connect a jumper wire between the Right Coolant Circulation Valve terminals in the Coolant Circulation Valve harness connector. Measure the voltage of the Right Coolant Circulation Valve Control circuit at the A/C Heater Control Module harness connector. Is the voltage above 10 volts? Yes Go to step 3) . No Repair the Right Coolant Circulation Valve Control circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
3. 3) MEASURE THE VOLTAGE OF THE RIGHT COOLANT CIRCULATION VALVE CONTROL CIRCUIT With the ignition off. Reconnect the Coolant Circulation Valve harness connector. Measure the voltage of the Right Coolant Circulation Valve Control circuit at the A/C Heater Control Module harness connector. Is the voltage above 10 volts? Yes Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Replace the Coolant Circulation Valve. «(Refer to HEATING & AIR CONDITIONING/PLUMBING/A/C EXPANSION VALVE - REMOVAL)»(ref-250627-S39679121872007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .

Scheme 61

1. When Monitored: Engine Running with the A/C on.
2. Set Condition: The A/C Heater Control Module detects an A/C Compressor malfunction.

For a complete HVAC Circuit Diagram (Refer to HEATING & AIR CONDITIONING - SCHEMATICS AND DIAGRAMS) .

Scheme 62

Scheme 63

Scheme 64

1. 1) TEST THE A/C COMPRESSOR CLUTCH Turn the ignition off. Disconnect the inline connector C106 in the underhood relay control module compartment. NOTE: Check connector - Clean/repair as necessary. Using a jumper wire to battery power, energize the A/C Compressor clutch. Does the A/C Compressor clutch energize? Yes Go to step 2) . No Go to step 3) .
2. 2) MEASURE THE RESISTANCE OF THE A/C COMPRESSOR CLUTCH SIGNAL CIRCUIT With the ignition off. Disconnect the A/C Heater Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance of the A/C Compressor Clutch signal circuit from the inline connector C106 to the A/C Heater Control Module harness connector. Is the resistance below 5.0 ohms? Yes Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Repair the A/C Compressor Clutch signal circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
3. 3) MEASURE THE RESISTANCE OF THE A/C COMPRESSOR CLUTCH SIGNAL CIRCUIT With the ignition off. Disconnect the A/C Compressor Clutch connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance of the A/C Compressor Clutch signal circuit from the inline connector C106 to the A/C Compressor Clutch connector. Is the resistance below 5.0 ohms? Yes Replace the A/C Compressor Clutch. «(Refer to HEATING & AIR CONDITIONING/PLUMBING/A/C COMPRESSOR - REMOVAL)»(ref-250627-S33691240202007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Repair the A/C Compressor Clutch signal circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .

Scheme 65

1. When Monitored: With the ignition on.
2. Set Condition: The A/C Heater Control Module detects an abnormal condition on the Recirculated Air Switchover Valve Control circuit.

For a complete HVAC Circuit Diagram, (Refer to HEATING & AIR CONDITIONING - SCHEMATICS AND DIAGRAMS) .

Scheme 66

Scheme 67

Scheme 68

1. 1) MEASURE RECIRCULATED AIR SWITCHOVER VALVE VOLTAGE NOTE: Inspect Fuse 37 located in the Underhood Accessory Fuse Block. If the fuse is open, repair the cause of the open fuse before continuing. Disconnect the Recirculated Air Switchover Valve harness connector. NOTE: Check connector - Clean/repair as necessary. Turn the ignition on. Measure the voltage of the Fused B(+) circuit at the Recirculated Air Switchover Valve harness connector. Is the voltage above 10 volts? Yes Go to step 2) . No Repair the Recirculated Air Switchover Valve Fused B(+) circuit. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
2. 2) MEASURE THE RESISTANCE OF THE RECIRCULATED AIR SWITCHOVER VALVE CONTROL CIRCUIT Turn the ignition off. Disconnect the Recirculated Air Switchover Valve harness connector. NOTE: Check connector - Clean/repair as necessary. Disconnect the A/C Heater Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance of the Recirculated Air Switchover Valve Control circuit from the Recirculated Air Switchover Valve harness connector to the A/C Heater Control Module harness connector. Is the resistance below 5.0 ohms? Yes Go to step 3) . No Repair the Recirculated Air Switchover Valve Control circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .
3. 3) MEASURE THE VOLTAGE OF THE RECIRCULATED AIR SWITCHOVER VALVE CONTROL CIRCUIT Reconnect the Recirculated Air Switchover Valve connector. Turn the ignition on. Measure the voltage of the Recirculated Air Switchover Valve Control circuit at the A/C Heater Control Module harness connector. Is the voltage above 10 volts? Yes Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Replace the Recirculated Air Switchover Valve. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/VACUUM CHECK VALVE - REMOVAL)»(ref-250627-S17423914902007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .

Scheme 69

1. When Monitored: With the ignition on.
2. Set Condition: Serial Communication K1 failure between the A/C Heater Control Module and the Instrument Cluster.

For a complete HVAC Circuit Diagram, (Refer to HEATING & AIR CONDITIONING - SCHEMATICS AND DIAGRAMS) .

Scheme 70

1. 1) MEASURE THE RESISTANCE OF THE SERIAL COMMUNICATION K1 CIRCUIT Turn the ignition off. Disconnect the Instrument Cluster harness connector. NOTE: Check connector - Clean/repair as necessary. Disconnect the A/C Heater Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance of the Serial Communication K1 circuit from the Instrument Cluster harness connector to the A/C Heater Control Module harness connector. Is the resistance below 5.0 ohms? Yes Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Repair the Serial Communication K1 circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .

Scheme 71

1. When Monitored: With the ignition on.
2. Set Condition: Serial Communication K2 failure between the A/C Heater Control Module and the Instrument Cluster.

For a complete HVAC Circuit Diagram, (Refer to HEATING & AIR CONDITIONING - SCHEMATICS AND DIAGRAMS) .

Scheme 72

1. 1) MEASURE THE RESISTANCE OF THE SERIAL COMMUNICATION K2 CIRCUIT Turn the ignition off. Disconnect the Instrument Cluster harness connector. NOTE: Check connector - Clean/repair as necessary. Disconnect the A/C Heater Control Module harness connector. NOTE: Check connector - Clean/repair as necessary. Measure the resistance of the Serial Communication K2 circuit from the Instrument Cluster harness connector to the A/C Heater Control Module harness connector. Is the resistance below 5.0 ohms? Yes Replace the A/C Heater Control Module. «(Refer to HEATING & AIR CONDITIONING/CONTROLS/HEATER CONTROL - REMOVAL)»(ref-250627-S10236888842007031500000) . Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) . No Repair the Serial Communication K2 circuit for an open. Perform «BODY VERIFICATION TEST»(ref-250636-S13380455952007031500000) .