1. Disconnect the blower motor resistor harness connector.
2. Turn the ignition switch to the RUN position.
3. Place the heater-A/C control in the VENT position.
4. Place the blower switch in the inoperative position.
5. Use a test lamp to probe between the blower motor resistor connector terminal D (circuit 72) and ground:

Does the test lamp light ?

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Go to Step 2

Go to Step 3

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

Is the repair complete?

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System OK

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1. Turn the ignition switch to the OFF position.
2. Disconnect the heater-A/C control connector C 1.
3. Inspect for a poor connection or an open in circuit 72 (LT BLU).

Is there a fault in the circuit?

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Go to Step 4

Go to Step 5

Repair circuit 72 (LT BLU).

Is the repair complete?

--

System OK

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Replace the heater-A/C control. Refer to Control Assembly Replacement .

Is the repair complete?

--

System OK

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