Did you perform the HVAC Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check

1. Turn ON the ignition, with the engine OFF.
2. Use the heater and A/C control to adjust the mode from FRONT defrost to MAX A/C.

Does the HTR/DEF/AC actuator cam rotate with each mode selection?

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Go to Step 11

Go to Step 3

1. Turn the ignition OFF.
2. Install a scan tool.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, command the HTR/DEF/AC door position from Defrost to Panel.

Does the HTR/DEF/AC actuator cam rotate with each command?

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Go to Step 12

Go to Step 4

1. Turn the ignition OFF.
2. Disconnect the HTR/DEF/AC actuator.
3. Turn ON the ignition, with the engine OFF.
4. Measure the voltage from the supply circuit of the HTR/DEF/AC actuator to a good ground.

Does the voltage measure near the specific value?

12 V

Go to Step 5

Go to Step 7

Measure the voltage from the supply circuit of the HTR/DEF/AC actuator to the motor return circuit of the HTR/DEF/AC actuator.

Does the voltage measure near the specific value?

12 V

Go to Step 6

Go to Step 8

1. Measure the voltage from the motor drive circuit of the HTR/DEF/AC actuator to the motor return circuit of the HTR/DEF/AC actuator.
2. With a scan tool, command the HTR/DEF/AC door position from Defrost to Panel.

Does the voltage change?

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Go to Step 10

Go to Step 9

1. Turn the ignition OFF.
2. Test the supply circuit of the HTR/DEF/AC actuator for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 15

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1. Turn the ignition OFF.
2. Test the motor return circuit of the HTR/DEF/AC actuator for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 15

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1. Turn the ignition OFF.
2. Test the motor drive circuit of the HTR/DEF/AC actuator for an open, a short to ground or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 15

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1. Turn the ignition OFF.
2. Inspect for poor connections/terminal tension at the HTR/DEF/AC actuator harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 15

Go to Step 11

Inspect the HTR/DEF/AC actuator, linkage and mode doors for binding or mechanical failure.

Did you find and correct the condition?

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Go to Step 15

Go to Step 13

Inspect for poor connections/terminal tension at the heater and A/C control harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 15

Go to Step 14

Replace the HTR/DEF/AC actuator. Refer to Mode Actuator Replacement .

Did you complete the replacement?

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Go to Step 15

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Replace the heater and A/C control. Refer to Control Assembly Replacement .

Did you complete the replacement?

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Go to Step 15

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2