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

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Go to Step 2

Go to Symptoms

Verify that the blower motor operates at high speed only.

Does the blower motor operate normally?

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Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

1. Disconnect the blower motor relay.
2. Turn the ignition switch to the RUN position.
3. Turn the mode selector switch to the HEAT position.
4. Connect a fused jumper wire to the blower motor relay connector cavity 87A (CKT 101) and cavity 30 (CKT 65).

Does the blower motor operate?

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Go to Step 4

Go to Step 5

Replace the blower motor relay.

Is the replacement complete?

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Go to Step 8

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1. Reinstall the blower motor relay.
2. Disconnect the blower motor resistor.
3. Connect a fused jumper wire to the resistor connector cavity B (CKT 64) and cavity C (CKT 101).

Does the blower motor operate at HIGH speed?

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Go to Step 7

Go to Step 6

Repair the open or high resistance in CKT 101 (DK BLU).

Is the repair complete?

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Go to Step 8

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

Is the replacement complete?

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Go to Step 8

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3