Did you perform the HVAC Blower Controls System Check?

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Go to Step 2

Go to HVAC Blower Controls System Check

Exchange the blower motor relay with a known good relay from the underhood 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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Go to HVAC Blower Controls System Check

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1. Turn the ignition switch to the ON 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 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 .

Is the repair complete?

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Go to HVAC Blower Controls System Check

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Replace the underhood junction block. Refer to Relay/Fuse Center Replacement in Wiring Systems.

Is the repair complete?

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Go to HVAC Blower Controls System Check

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

Is the repair complete?

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Go to HVAC Blower Controls System Check

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