1. Disconnect the blower motor resistor.
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 OFF position.
5. Use a test lamp to probe between the following blower motor resistor harness connector terminals and ground:

•	LO - B (CKT 60)

•	M1 - A (CKT 63)

•	M2 - D (CKT 72)

•	M3 - C (CKT 73)

•	HI - F (CKT 52)

Does the test lamp light for any test?

--

Go to Step 2

Go to Step 5

1. Leave the probe connected to the same terminal that illuminated the test lamp
2. Disconnect the heater-A/C control connector C 1.

Does the test lamp keep lighted?

--

Go to Step 3

Go to Step 4

Locate and repair the short to B+ in the affected circuit:

1. LO - Blower motor terminal B (CKT 60).
2. M1 - Blower motor resistor harness connector terminal A (CKT 63).
3. M2 - Blower motor resistor harness connector terminal D (CKT 72).
4. M3 - Blower motor resistor harness connector terminal C (CKT 73).
5. HI - Blower motor resistor harness connector terminal F (CKT 52).

Is the repair complete?

--

System OK

--

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

Is the repair complete?

--

System OK

--

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

Is the repair complete?

--

System OK

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