Schematic Reference: HVAC Schematics

Connector End View Reference: HVAC Connector End Views

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

Did you review the auxiliary Heat operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - HVAC Systems - Manual

2

1. Turn ON the ignition, with the engine OFF.
2. Place the auxiliary blower motor switch to the OFF position.

Is the blower motor OFF?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

1. Turn OFF the ignition.
2. Disconnect the auxiliary blower motor switch connector.
3. Turn ON the ignition, with the engine OFF.

Is the blower motor OFF?

Go to Step 8

Go to Step 4

1. Turn OFF the ignition.
2. Disconnect the auxiliary blower motor resistor assembly connector.
3. Connect the auxiliary blower motor switch connector.
4. Turn ON the ignition, with the engine OFF.

Is the blower motor OFF?

Go to Step 6

Go to Step 5

Test the auxiliary blower motor supply voltage circuit and the auxiliary high blower motor speed control circuit of the auxiliary blower motor for a short to voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

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Test the LO and MED auxiliary blower motor speed control circuits for a short to voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 7

Inspect for poor connections at the harness connector of the auxiliary blower motor resistor assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 9

Inspect for poor connections at the harness connector of the auxiliary blower motor switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 10

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

Did you complete the replacement?

Go to Step 11

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Replace the rear blower motor switch. Refer to Heater Control Blower Switch Replacement .

Did you complete the replacement?

Go to Step 11

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2