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

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Go to Step 2

Go to Symptoms

1. Disconnect the blower motor resistor connector.
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 inoperative position.
5. Use a test lamp in order to backprobe between ground and the blower motor resistor connector terminal listed below:

•	LO - Terminal B

•	M1 - Terminal A

•	M2 - Terminal D

•	M3 - Terminal C

Does the test lamp light?

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Go to Step 3

Go to Step 4

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

Is the repair complete?

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Go to Step 7

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1. Turn the ignition switch to the OFF position.
2. Disconnect the heater-A/C control connector C1.
3. Inspect for a poor connection, an open, or a short to ground in the inoperative circuit as listed below: Refer to Circuit Testing in Wiring Systems.

•	LO - Terminal B

•	M1 - Terminal A

•	M2 - Terminal D

•	M3 - Terminal C

Is a poor connector, an open, or a short to ground in the inoperative circuit ?

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Go to Step 5

Go to Step 6

Repair the fault in the circuit. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 7

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

Is the repair complete?

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Go to Step 7

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Verify that the system operates properly.

Does the system operate properly?

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System OK

Go to Diagnostic Starting Point