Schematic Reference: HVAC Schematics

Connector End View Reference: HVAC Connector End Views

DEFINITION: The auxiliary blower motor operates with the HVAC controls in the OFF position.

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Turn ON the ignition, with the engine OFF.
2. Turn OFF the auxiliary HVAC controls.

Is the auxiliary blower motor OFF?

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Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

With the scan tool observe the auxiliary Blower Motor Speed Command parameter in the HVAC data list.

Does the scan tool indicate that the auxiliary Blower Motor Speed Command parameter is near the specified value?

0 Counts

Go to Step 4

Go to Step 6

1. Turn OFF the ignition.
2. Disconnect the HVAC control module.
3. Turn ON the ignition, with the engine OFF.

Is the auxiliary blower motor OFF?

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Go to Step 6

Go to Step 5

Inspect for poor connections at the harness connector of the auxiliary blower motor resistor. Refer to Wiring Repairs and Connector Repairs .

Did you find and correct the condition?

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Go to Step 9

Go to Step 7

Inspect for poor connections at the harness connector of the HVAC control module. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

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Go to Step 9

Go to Step 8

Replace the auxiliary blower motor resistor. Refer to Auxiliary Blower Motor Resistor Replacement .

Did you complete the replacement?

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Go to Step 9

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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 9

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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