Was a diagnostic system check performed?

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Go to Step 2

Go to Diagnostic System Check - 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?

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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?

B+

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?

B+

Go to Step 7

Go to Step 8

Replace the blower resistor assembly. Refer to Blower Motor Resistor Replacement Heating, Ventilation and Air Conditioning .

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 in Engine Electrical.

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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