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Old 03-31-2001, 08:04 AM
Registered User
Join Date: Feb 2001
Posts: 23
My front powered seats do not function without turning the car on.
THEY SHOULD WORK.What could be wrong?

Thanx for your help.

1991 190e 2.6
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Old 03-31-2001, 08:18 AM
Kuan's Avatar
Join Date: Jan 2001
Location: At the Birkebeiner
Posts: 3,787
Did US models come with seats that worked with the ignition off before '99? I know for a fact by law that the windows don't work with the ignition off. Did yours work before and then all of a sudden quit?

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Old 03-31-2001, 09:44 AM
Robert W. Roe's Avatar
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Join Date: May 1999
Location: Lehigh Valley PA
Posts: 1,321
I'm pretty sure that Kuan is correct. For safety reasons US law prohibits power seats from working while the key is off. This prevents a child from crushing themselves by playing with the seat controls if they are left alone to play in the front seat (which they shouldn't be anyway, but this is the USA for ya.) Either the door has to be open, or the key has to be on. That's the way my W126 is also.
Bob Roe
Lehigh Valley PA USA
73 Olds 88, 72 MB 280SE, 78 Datsun 280Z, 71 T-Bird, 72 Olds 88, 83 Nissan Sentra, 85 Sentra, 73 230.6, 91 Integra, 83 300SD, 91 Volvo 940GLE wagon, 84 300SD, 95 Subaru Legacy L wagon, 02 Mountaineer, 91 300TE, 08 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon all gone... currently
2007 Honda Odyssey Touring, 2011 Honda Odyssey Touring
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Old 03-31-2001, 10:12 AM
Glen's Avatar enthusiast
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Location: Carlsbad, CA USA
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Try operating the seats with one of the front doors open...

Glen Tokuhara
Beauty & the Beast and the wagon that could!
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Old 03-31-2001, 10:13 AM
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Join Date: Dec 2000
Posts: 368
That's correct. In order to operate the seats one of the doors has to be open or the ignition on. If you open the door and cannot move the seats then you need to check your door switch. Once you get in the car and close the door your seats cannot be adjusted unless you trun on the ignition.

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Old 03-31-2001, 02:08 PM
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Join Date: Feb 2001
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1991 190E 2.6
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Old 03-31-2001, 10:23 PM
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Join Date: Dec 2000
Posts: 368
Check the door switches. Is your dome light turning on?
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Old 03-31-2001, 11:05 PM
Beatle Juice
Posts: n/a
There is a diode in the fuse box that controls the power seats (door open) function. I would check that or the ice cube relays in the fuse box. The diode looks like a blade fuse that is grey in color.

Good luck....
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Old 03-31-2001, 11:56 PM
Johnson Chan
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They are correct, on my cars, you have to have the door open to move the seats, or when the key is in ignition and turned
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Old 04-01-2001, 12:28 AM
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Join Date: Dec 2000
Posts: 368
Beatle juice is right. I forgot about the diode, it's probably the first thing you should check. However, on your car you cannot see it by just opening the fuse box. You have to take of the fuse cover 6 philip screws so you can access the rear of the fuse box (put the hood in upright position, it's much easier). You'll see a small gray plug next to all of the silver relays. That's your diode. Snap it open and check if it's burned. You can get it at the dealrship for a few bucks.

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Old 05-26-2002, 03:27 PM
brookspw's Avatar
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Join Date: Dec 2001
Location: Nashville, TN
Posts: 551
See my email to you, vinamg, about trying to FIND this diode.

1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles
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