Schematic Reference: HVAC Schematics

DEFINITION: Air recirculation is inoperative or always ON.

1

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle

2

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Recalibrate the motors. Refer to Actuator Recalibration .
4. With a scan tool, observe the current DTC list in Heating and Air Conditioning.

Does the scan tool display any DTCs?

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Go to Diagnostic Trouble Code (DTC) List - Vehicle

Go to Step 3

1. Place the blower motor switch in the maximum speed position.
2. Alternately, place the mode switch in the Max A/C and Vent positions.

Does the recirculation door move from the recirculation position to the ambient air position?

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Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 4

4

1. With a scan tool, observe the Recirculation Dr. Command parameter in the HVAC data list.
2. Alternately, place the mode switch in the Max A/C and Vent positions.

Does the scan tool indicate that the value of the Recirculation Dr. Command parameter changes from the minimum specified value to the maximum specified value?

0-230 Counts

Go to Step 6

Go to Step 5

Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

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Go to Step 8

Go to Step 7

Inspect the air distribution system for the following conditions:

Did you find and correct the condition?

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Go to Step 8

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Replace the HVAC control module. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

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Go to Step 8

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3