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 in Vehicle DTC Information

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 11

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 high blower motor control circuit of the blower motor.

Does the test lamp illuminate?

Go to Step 12

Go to Step 5

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

Did you find and correct the condition?

Go to Step 16

Go to Step 6

1. Disconnect the HVAC control module.
2. Connect a test lamp between the ignition 3 voltage circuit of the HVAC control module and a good ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 10

Connect a test lamp between the battery positive voltage circuit of the HVAC control module and a good ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 9

Test the ground circuits of the HVAC control module for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 16

Go to Step 13

Repair the battery positive voltage circuit of the HVAC control module. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 16

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Repair the ignition 3 voltage circuit of the HVAC control module. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 16

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Repair the blower motor supply voltage circuit of the blower motor. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 16

--

Inspect for poor connections at the blower motor. 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 16

Go to Step 14

Inspect for poor connections at the HVAC control module. 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 16

Go to Step 15

Replace the blower motor. Refer to Blower Motor Replacement in Heating, Ventilation and Air Conditioning.

Did you complete the replacement?

Go to Step 16

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Replace the HVAC control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 16

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2