Where is the fuse, resistor and blower motor located?

Tiny
JVERB25
  • MEMBER
  • 2008 BUICK ENCLAVE
  • 3.4L
  • V6
  • 4WD
  • AUTOMATIC
  • 180,000 MILES
How to test voltage on the following to determine if the blower motor is working.
Saturday, April 23rd, 2022 AT 2:29 PM

7 Replies

Tiny
JVERB25
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Blower motor, fuse, resistor, and relay I believe.
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Saturday, April 23rd, 2022 AT 2:31 PM
Tiny
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I am attaching the wiring diagram below, but we need to do a couple things.

I would start going to the resistor (control module) and check power on the B+ wire which will have 12 volts all the time. Then check for a good ground by using the ground terminal to check for the same B+ voltage.

This will tell us both are okay.

Next, we need to turn the fan on low and check the voltage on the blower speed control wire. Then increase the fan speed and make sure the voltage changes.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Lastly, we need to check the voltage going to the blower motor and check for a good ground on the low reference wire.

Let's start with this info and go from there. Let me know what questions you have.

Thanks
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Sunday, April 24th, 2022 AT 4:05 PM
Tiny
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So, I’ve checked the power line to the blower motor, and it puts out 14.5v. I’ve checked both HVAC fuses, the one under the hood and under the glove box. Both are good. I could not find the resistor. There was a plug to the left of the blower that had plugs in it. Both were connected but I didn’t unplug and test any of them as I did not know what they were.
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Sunday, April 24th, 2022 AT 5:26 PM
Tiny
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Okay. Yes, the connector that is next to the blower motor is most likely the resistor. They call it a control module. So, if you have battery voltage getting to it then it is likely the issue.

There are two connectors for it, and I am attaching the info on this below.

Basically, you need to check the voltage getting to and what the speed control is showing. This will mean if the blower is not working then the resistor is the issue or the blower motor.

Have you put 12 volts to the blower motor and make sure it works?
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Monday, April 25th, 2022 AT 9:16 AM
Tiny
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So, I replaced the blower motor itself because assuming I was getting voltage to the motor, I figured it was that. But it’s still not working so I will be replacing the control module now. I’ll update you when it’s completed.
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Wednesday, May 4th, 2022 AT 12:21 AM
Tiny
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Replaced both blower motor and control module. Still not working. If the fuses, motor and resistor are all working. What else could I have wrong?
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Wednesday, May 4th, 2022 AT 6:04 AM
Tiny
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Your control module would be the likely cause, but we need to go to the resistor and check voltage on the speed control wire when the blower is turned on and find out what the control module is sending to the resistor/control module. If we don't confirm this, then we could be wrong or missing something. Also, we need to start checking this because we are assuming that the parts that you put on the vehicle are good but there is always a chance that they are faulty as well.

Take a look at the wiring diagram above and tell me what the voltage is on the speed control wire form the HVAC module when the blower is turned on.

If you have no voltage, you can also confirm that everything else works by jumping voltage to that wire and the blower should come on. Do not put more than 12 volts to it as that should be the high-speed command.
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Wednesday, May 4th, 2022 AT 7:30 AM

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