Was the Heater Blower Controls System Check performed?

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Go to Step 2

Go to Heater Blower Controls System Check

1. Place the heater and A/C controller mode switch in the Heat position.
2. Place the heater and A/C controller blower motor switch in the medium 2 position.
3. Disconnect the blower motor resistor/relay connector.
4. Place the ignition switch in the RUN position.
5. Connect an unpowered test lamp between the blower motor resistor/relay connector, cavity F for CKT 72 (LT BLU), and ground.

Does the test lamp light?

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Go to Step 3

Go to Step 4

Replace the blower motor resistor/relay.

Refer to Blower Motor Resistor Replacement .

Is the repair complete?

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Go to Heater Blower Controls System Check

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1. Disconnect the heater and A/C controller C2 connector.
2. Connect a J 39200 between the heater and A/C controller, pin C, and pin G.

Is continuity present?

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Go to Step 5

Go to Step 6

Repair the open in CKT 72 (LT BLU) between the heater and A/C controller connector and the blower motor resistor/relay connector.

Refer to Wiring Repairs .

Is the repair complete?

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Go to Heater Blower Controls System Check

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Replace the heater and A/C controller.

Refer to Control Assembly Replacement .

Is the repair complete?

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Go to Heater Blower Controls System Check

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