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

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Go to Step 2

Go to Symptoms

Inspect the fuse block for an open in the HVAC HI fuse.

Is the HVAC HI fuse open?

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Go to Step 3

Go to Step 6

1. Disconnect the blower motor resistor.
2. Use a test lamp to probe between the blower motor resistor harness connector terminal G (CKT 40) to ground.

Does the test lamp light ?

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Go to Step 5

Go to Step 4

Locate and repair a short to ground in CKT 40 (ORN). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 10

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1. Turn the ignition switch to the RUN position.
2. Place the heater-A/C control in the VENT position.
3. Place the blower switch in the HI position.
4. Use a test lamp to probe between the blower motor resistor harness connector terminal F (CKT 52) and ground.

Does the test lamp light ?

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Go to Step 6

Go to Step 7

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

Is the repair complete?

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Go to Step 10

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1. Turn the ignition switch to the OFF position.
2. Disconnect the heater-A/C control connector C 1.
3. Use a Digital Multi Meter (DMM) to test for an open, excessive resistance or a short to ground in CKT 52 (ORN) between the heater-A/C control harness connector C 1 terminal C and the blower motor resistor harness connector terminal F.

Is there an open or short to ground in CKT 52 (ORN)?

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Go to Step 8

Go to Step 9

Locate and repair the open or the short to ground in CKT 52 (ORN). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 10

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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 10

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Verify that the system operates properly.

Does the system operate properly?

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System OK

Go to Symptoms