DEFINITION: The front blower motor operates in HI speed only.

Did you review the HVAC blower operation and perform the necessary inspections?

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Go to Step 2

Go to Symptoms in HVAC Systems-Manual

1. Place the ignition switch in the RUN position.
2. Place the heater and A/C controller mode switch in the Heat position.
3. Place the heater and A/C controller blower motor switch in the medium 2 position.

Does the blower motor operate?

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

Go to Step 3

1. Disconnect the blower motor resistor/relay.
2. Connect a J 35616-200 unpowered test lamp between the blower motor resistor/relay connector, cavity F for CKT 72 (LT BLU), and ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

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Go to Step 6

Go to Step 4

1. Disconnect heater and A/C controller connector C2.
2. Connect a J 39200 digital multimeter (DMM) between heater and A/C controller pin C and pin G. Refer to Circuit Testing in Wiring Systems.

Is continuity present?

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Go to Step 5

Go to Step 7

Repair the open in CKT 72 (LT BLU). Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 8

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

Did you complete the repair?

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Go to Step 8

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Replace the heater and A/C controller.

Refer to Control Assembly Replacement .

Did you complete the repair?

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Go to Step 8

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Operate the blower motor in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3