Schematic Reference: HVAC Schematics

Connector End View Reference: HVAC Connector End Views

DEFINITION: The blower motor does not operate in every speed position.

Did you perform the HVAC Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - HVAC Systems - Manual

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

Does the blower motor operate in each speed position?

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

Go to Step 3

1. Turn OFF the ignition.
2. Disconnect the blower motor.
3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between the supply voltage circuit and a good ground.
5. Place the blower motor switch in the minimum speed position.

Does the test lamp illuminate?

Go to Step 4

Go to Step 6

Connect a test lamp between the supply voltage circuit and the ground circuit.

Does the test lamp illuminate?

Go to Step 8

Go to Step 5

Test the ground circuit of the resistor assembly for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 15

Go to Step 9

1. Turn OFF the ignition.
2. Disconnect the resistor assembly connector.
3. Turn ON the ignition, with the engine OFF.
4. Place the blower motor switch in the minimum speed position.
5. Connect a test lamp between the low blower motor control circuit of the resistor assembly and a good ground.

Does the test lamp illuminate?

Go to Step 9

Go to Step 7

1. Turn OFF the ignition.
2. Disconnect the HVAC control module connector C2.
3. Turn ON the ignition, with the engine OFF.
4. 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 10

Go to Step 11

Inspect for bad connections at the harness connector of the blower motor. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 15

Go to Step 12

Inspect for bad connections at the harness connector of the blower motor resistor assembly. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 15

Go to Step 13

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

Did you find and correct the condition?

Go to Step 15

Go to Step 14

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 15

--

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

Did you complete the replacement?

Go to Step 15

--

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

Did you complete the replacement?

Go to Step 15

--

Replace the HVAC control module. Refer to HVAC Control Module Replacement .

Did you complete the replacement?

Go to Step 15

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3