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

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Go to Step 2

Go to Symptoms - HVAC Systems - Manual

Exchange the blower motor relay with a known good relay from the underhood wiring harness junction block.

Does the blower motor operate in all speeds?

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Go to Step 3

Go to Step 4

Replace the faulty relay.

Is the repair complete?

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System OK

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1. Turn the ignition switch to the RUN position.
2. Turn the blower switch to M3.
3. Use the J 39200 Digital Multimeter (DMM) in order to backprobe the blower resistor assembly.
4. Measure the voltage between terminal E and ground.

Does the voltage measured equal the specified value?

battery positive voltage

Go to Step 5

Go to Step 6

1. Use the J 39200 DMM in order to backprobe the underhood wiring harness junction block connector C3.
2. Measure the voltage between terminal C10 and ground.

Does the voltage measured equal the specified value?

battery positive voltage

Go to Step 7

Go to Step 8

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

Is the repair complete?

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System OK

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Replace the underhood wiring harness junction block. Refer to Underhood Fuse Block Replacement .

Is the repair complete?

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System OK

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Repair the open in CKT 101 between the blower resistor assembly and the underhood wiring harness junction block. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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System OK

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