BCM replacement - Chevy HHR Network


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Old 12-04-2017, 01:28 PM   #1
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BCM replacement

I have a 09 panel with a problem with the blower fan not starting intermittently. (see https://www.chevyhhr.net/forums/prob...ost827917)(and #post831924)

I have the new BCM. I have gotten both answers to this

Does the BCM need to be programmed? if needed

Does the programming need to be with the BCM installed or can it be programmed outside of the car (not installed)

Is the car needed to program the BCM if it can be not installed.
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Old 12-04-2017, 02:03 PM   #2
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What do you think the BCM has to do with the fan? Why do you think a computer would forget how to do 1 of 3,000 functions?

The BCM only controls the relay, that you said works. And that is only to make sure the fan is running if the A/C is on.


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Old 12-04-2017, 07:41 PM   #3
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Don
I do not know if the relay is working, let.

With the fan not working I have probed the plug at the fan fore and aft and at #4 fuse.
I have a circuit at the fuse and no circuit at the fan so my open is between the #4 fuse and the fan motor. Donít know if the relay contacts are the open or it might be on the coil side of the relay and I have a logic side problem. Will not know that until I get to the BCM and probe it. I do not know at this time if the coil of the relay is being energized. I have not gotten to the bcm in the car let. I do have a new BCM on hand if I need it.
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Old 12-04-2017, 08:18 PM   #4
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Take a look at the schematic I provided. The #4 fuse involved is on the underhood box, it also feeds some other things.

Yoy are using some terminology that I am not familiar with; I am not sure what "have a circuit means".

Your problem is most likely in the resistor or the switch or the motor. There is a splice in the Hot wire that somebody found was bad. The BCM has nothing to do with your description of the problem, and you are testing the wrong things.

Computers do not just up and break their software in one application. There are cheaper non-destructive ways to test relays.

Feel free to play Mr. Wizard, but he was analog.
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Old 12-05-2017, 11:33 AM   #5
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So this post



Quote:
Originally Posted by rmc51 View Post
My 09 LS panel is doing the same thing. It is not the fan motor, it is not the resistor, it is not the #4 fuse in the fuse box. The relay is on the BCM. The BCM is behind or under the radio. I need to open the center console to get/find the BCM, so I,m looking for a post on how to get to the bcm/radio area. Working on it.

found two posts that may relate some as to what I'm talking about
https://www.chevyhhr.net/forums/prob...54/#post783972
https://www.chevyhhr.net/forums/prob...85/#post826715

Did you ever replace the control module behind the waterfall below the radio?
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Old 12-06-2017, 06:30 PM   #6
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Quote:
Originally Posted by Oldblue View Post
So this post






Did you ever replace the control module behind the waterfall below the radio?
I found this, doesn't look like the bcm is behind the waterfall, looks like it is under the kick panel on the right side of the center console.

http://repairguide.autozone.com/znet...3f807cb09d.gif

That may make it easy to get at??????
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Old 12-06-2017, 06:38 PM   #7
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I give up, again! You win!
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Old 12-07-2017, 07:45 AM   #8
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The control panel for the HVAC





Is most likely the problem.
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Old 12-07-2017, 09:24 AM   #9
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Quote:
Originally Posted by Oldblue View Post
The control panel for the HVAC

Is most likely the problem.



With the fan not working I have probed the plug at the fan fore and aft the fan and aft #4 fuse at the blue marks.

I have a circuit aft the fuse this tells me that I have continuity and a complete circuit through the fuse to the battery and no circuit at the fan connector B, so my open is between the two blue dots(#4 fuse and the fan motor). When I probed the fan at connector A&B. I was factoring out the rest of the circuit, the resistor and the HVAC control panel. My open in the circuit is between my two probed test points at the b connector of the fan up through my test point c2/f6 aft the fuse. Do you understand what I am saying?
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Old 12-07-2017, 09:29 AM   #10
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Ever hear the phrase "start simple?" If something was wrong with the BCM itself, you'd have more troubles than just an intermittent starting blower motor.
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