1. Disconnect the blower motor resistor.
2. Turn the ignition switch to the ON position.
3. Place the heater-A/C control in the VENT position.
4. Place the blower switch in the OFF position.
5. Use a test lamp to backprobe between the blower motor resistor harness connector terminal listed below and ground:

•	LO - B (circuit 60)

•	M1 - A (circuit 63)

•	M2 - D (circuit 72)

•	M3 - C (circuit 73)

•	HI - F (circuit 52)

Does the test light turn when checking each terminal?

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Go to Step 2

Go to Step 5

1. Leave the test light connected to same terminal that turned test light on.
2. Keep the ignition switch in the OFF position.
3. Disconnect the heater-A/C control connector C 1.

Does the test lamp light?

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Go to Step 3

Go to Step 4

Repair the short to B+ in the following circuit:

Is the repair complete?

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System OK

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Replace the heater-A/C control. Refer to Control Assembly Replacement in HVAC Systems with A/C - Manual.

Is the repair complete?

--

System OK

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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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