Power Seats/Rear Window Defroster Relationship? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-23-2004, 12:08 AM   #1
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Default Power Seats/Rear Window Defroster Relationship?

Recently I've had to keep my '92 SSE outside because my 2001 SSEi stays in the garage. On very cold days I've noticed that the rear window defrosters fails to come on. At the same time I've noticed that the power seats do not work either.

Once she warms up, or sits for a while after warmup and engine shutdown, the rear defrosters and power seats work just fine. On warmer days everything works too.

Can someone give me some hints as to troubleshooting this. I have never experienced this problem before all the time she sat in the garage all night.

Thanks in advance,
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Old 03-23-2004, 12:10 AM   #2
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I guess I didn't make it too clear that it is the '92 of which I speak.
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Old 03-23-2004, 12:13 AM   #3
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Do you have the 15-way seats?
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Old 03-23-2004, 12:37 AM   #4
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yes
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Old 03-23-2004, 02:08 PM   #5
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I believe a bad circuit breaker is at fault. I don't have the manual here, but if you don't know which one it is I can tell you later.
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Old 03-23-2004, 08:40 PM   #6
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Try circuit breaker No. 4 in the fuse block.
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Old 03-23-2004, 09:32 PM   #7
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fuddyduddy,

How can it be a circuit breaker if it corrects itself when it warms up a bit. Does the circuit breaker reset?
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Old 03-23-2004, 10:23 PM   #8
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I'm not sure, I could only guess. However the circuit breaker is the only thing those two share in common. Do you have problems with the power door locks at the same time?
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Old 03-23-2004, 11:36 PM   #9
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Quote:
Originally Posted by fuddyduddy121
I'm not sure, I could only guess. However the circuit breaker is the only thing those two share in common. Do you have problems with the power door locks at the same time?
I'm going to venture a guess here that maybe the seat motors are blowing the breaker when it'* really cold -- i.e. stiff grease won't let the motor(*) turn, and thus the defogger won't work either. But I doubt you're moving the seat every time you get in, so...? Dunno...
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Old 03-24-2004, 10:25 PM   #10
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acg-

Right. I do not necessarily move my seat when the rear defogger is on. The book says that what could cause this is one of the seat positions being at its limit. It is not. None are.

I think I may have a weak relay #4. I think the rear defogger is tripping the relay and then both rear and seats don't work as a result. When its warmer there is less voltage load to trip out the breaker so everything works fine.

Does anyone know if there is a duplicate #4 breaker in there somewhere so I could trade one out to see what affect that has?
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