Schematic Reference: HVAC Schematics

DEFINITION: The auxiliary blower motor is ON while the auxiliary blower motor switches are in the OFF position.

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

1. Turn ON the ignition, with the engine OFF.
2. Place the rear auxiliary blower motor switch in the OFF position.
3. Place the front auxiliary blower motor switch in the OFF position.

Is the auxiliary blower motor OFF?

Go to Step 3

Go to Step 4

Turn the rear auxiliary blower motor switch to any speed position

Does the auxiliary blower motor operate?

Go to Step 5

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

1. Turn OFF the ignition.
2. Disconnect the auxiliary blower motor resistor assembly.
3. Disconnect the front auxiliary blower motor switch.
4. Connect a test lamp to battery positive voltage and probe each of the auxiliary blower motor speed control circuits at the auxiliary blower motor resistor assembly connector.

Does the test lamp illuminate?

Go to Step 6

Go to Step 8

Inspect the rear auxiliary blower motor switch enable circuit for a short to ground. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 7

Repair the short to ground in the appropriate auxiliary blower motor speed control circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 9

--

Inspect for poor connections at the harness connector of the front auxiliary HVAC control assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

Replace the front auxiliary HVAC control assembly. Refer to HVAC Control Module Replacement .

Did you complete the replacement?

Go to Step 9

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2