Schematic Reference: HVAC Schematics

Connector End View Reference: HVAC Connector End Views

DEFINITION: The blower motor is inoperative in all speed positions.

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Turn ON the ignition, with the engine OFF.
2. Place the blower motor switch in each speed position.

Does the blower motor operate in any speed position?

Go to Blower Motor Malfunction

Go to Step 3

1. Turn OFF the ignition.
2. Disconnect the blower motor.
3. Turn ON the ignition, with the engine OFF.
4. Probe the blower motor supply voltage circuit of the blower motor with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 8

1. Place the blower motor switch to the maximum speed position.
2. Connect a test lamp between the blower motor supply voltage circuit and the blower motor control circuit of the blower motor.

Does the test lamp illuminate?

Go to Step 9

Go to Step 5

1. Connect the blower motor.
2. Disconnect the blower motor resistor assembly.
3. Place the blower motor switch in the Low speed position.
4. Connect a test lamp between the blower motor low control circuit of the blower motor resistor assembly and a battery positive voltage.

Does the test lamp illuminate?

Go to Step 6

Go to Step 7

6

Test the blower motor control circuit of the blower motor for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 14

Go to Step 11

Test the ground circuit of the HVAC control assembly for an open and a high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 14

Go to Step 10

Repair the blower motor supply voltage circuit of the blower motor for an open. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 14

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Inspect for poor connections at the blower motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 14

Go to Step 12

Inspect for poor connections at the HVAC control assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 14

Go to Step 13

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

Did you complete the replacement?

Go to Step 14

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Replace the blower motor. Refer to Blower Motor Replacement .

Did you complete the replacement?

Go to Step 14

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Replace the HVAC control assembly. Refer to Heater and Air Conditioning Control Replacement .

Did you complete the replacement?

Go to Step 14

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2