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05 buick century electrical problem ??
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jaydodd
New User
Dec 2, 2007, 9:07 AM
Post #1 of 2
(1605 views)
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05 buick century electrical problem ??
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Hello I own a 2005 Buick century,( wifes car ) She has stated that when she turns on her blower, the cruse controll light comes on, and the direction she wants the air to go to doesnt work right ? I have used the reset button in the fuse box, and it works right for a short time, but goes back to the problem. What am i looking at here ?
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DanD
Veteran
/ Moderator
Dec 2, 2007, 3:26 PM
Post #2 of 2
(1597 views)
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Re: 05 buick century electrical problem ??
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This is why I love my trade; strange and crazy things happening.
Sorry for being so long in my reply but I’ve been looking through wiring diagrams, service bulletins and didn’t come up with anything concrete as to what going on with your system. We’re dealing with a minimum of 4 different control modules (computers) that are possibly involved with this problem and a least another 5 or 6 sitting in the background listening in or possibly causing the problem?
All these different modules are connected together via a serial data line of communications; each module can receive and send information as to what is asked of them or what they require.
Now when you switch the blower on, the HVAC (heating, ventilation, air conditioning) module sends out a message on the serial line that it wants too turn on the blower motor. All the modules will look at this message and react if it needs to; for example the ABS (antilock brake system) module doesn’t or I should say shouldn’t care. But the PCM (power-train control module) does; it wants to make sure that the engine & electrical system can handle the extra load that the blower motor may put on the system.
This is where it gets complicated; who’s doing what to whom?
Is the problem an input to the heating system, is it a misunderstood signal on the serial data line?
I know none of this has brought you to an answer to you vehicles’ problem but hopefully it has shown you that today’s systems are something more complicated then an off & on switch. Today’s systems are “intergraded” and every system knows or can affect the other.
You May have to bring this in to someone that is familiar with the different systems and can understand what happens with this data
Dan.
Canadian "EH"
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