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Memory Seat Controller Bypass?

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FriendlyVolcano
Posts: 5
Joined: Fri Nov 22, 2019 10:29 pm
Location: Portland Oregon

Memory Seat Controller Bypass?

Post by FriendlyVolcano » Mon Jun 29, 2020 7:13 pm

According to my mechanic, my E24 '88 M6 has a faulty driver's memory seat control module (BMW PN 61311371916).

My problem is that the seat can go in all directions except backwards. The problem is intermittent but has gotten worse and worse. First I swapped the switch from the passenger side with no luck. The shop switched out one memory seat control unit (not the switch on the parking brake area but the computer board below the seat) from another M6 and says it works. Problem is that these units are rare even from parts cars, so I'm having no luck sourcing one.

So here are three questions:

1) Can the passenger's side type of under-seat controller be used instead of the driver's side if I don't care about the 3-way memory function? I'd rather have the seat fully operable than worry about programmable memory positions.

2) Does the driver's seat have a limit stop sensor for each motor channel so that the seat doesn't go forward or backward infinitely?

3) Does anyone know if there's a repair service that works on board level fixes of BMW electronics? I'm thinking there's probably just a loose solder joint or dying capacitor with a unit this old.

plip1953
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Re: Memory Seat Controller Bypass?

Post by plip1953 » Tue Jun 30, 2020 7:10 am

Looking at RealOEM, it doesn't seem to offer two versions of the control unit depending on whether it's for the driver or passenger seat.

My pretty clear impression is that the motors will run until they encounter resistance from the mechanical part of the seat being at the end of it's travel range, or if an obstruction is encountered. This seems to be supported by the fact that on my headrest where the flexi drive wire has stopped driving (again!!) the motor will simply run and run whenever the control button is pressed.
Phil
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FriendlyVolcano
Posts: 5
Joined: Fri Nov 22, 2019 10:29 pm
Location: Portland Oregon

Re: Memory Seat Controller Bypass?

Post by FriendlyVolcano » Tue Jun 30, 2020 8:34 pm

I guess there's nothing to stop someone from pushing forever and burning out the motor. As it turns out, I've found a local electronics repair shop where the guy has actually worked on these boards. It's usually a bad solder joint, cap, or relay. I've managed to find a donor board on Ebay for $40 which we can harvest parts from if need be. Ah the joys of 1980's electronics!

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