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R129 Power Seat Problem / mind of its own

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R129 Power Seat Problem / mind of its own

 
Old 03-25-2008, 05:28 PM
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R129 Power Seat Problem / mind of its own

Hello All,

I have a 92 500SL and while parked with the door open the seat moved all the way forward on its own.

I was able to barely get out, could not stop it by using the switch.

after banging the seat control switch I was able to slide only the Bottom back enough for me to fit in.

Now when i try and tilt the Seat back , back. the seat bottom slides forward.

I am able to slide the bottom back, however I cannot get the Seat back to move back. ( i hope this isnt too confusing )

I've read the Fuse and switch cleaning suggestions. However the seat back will move forward on it's own so I know there is power,
I am assuming that the seat control switch is shorted out and I am looking to source a replacement.

Does this sound reasonable? or does anyone have any other Idea's?

this is what I have come up with so far and will be checking :

http://www.pairlist.net/pipermail/r1...il/001735.html


Thanks All in advance !
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Old 03-25-2008, 05:29 PM
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PS

It will also move itself forward randomly while driving.

pretty scary stuff.
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Old 04-12-2008, 09:36 PM
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1998 E320, 1994 320 SL,2000 Ford F 150.1997 Gixxer 1100
Power seats

Same issue on my similar vintage SL. If I try to adjust it back it continues forward. After a bit of switch wiggle, it will move back. Does not other me much as I leave the seat in pretty much the same position. NEVER BOTHERED TO FIGURE WHY
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Old 04-07-2011, 01:28 PM
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1992 sl500
Same issue someone please help

Same year same issues, did it to passenger side, and now drivers, now they both stoped working all together.
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Old 09-20-2017, 01:17 PM
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2007 S600
Originally Posted by RuNLeVeL6 View Post
Hello All,

I have a 92 500SL and while parked with the door open the seat moved all the way forward on its own.

I was able to barely get out, could not stop it by using the switch.

after banging the seat control switch I was able to slide only the Bottom back enough for me to fit in.

Now when i try and tilt the Seat back , back. the seat bottom slides forward.

I am able to slide the bottom back, however I cannot get the Seat back to move back. ( i hope this isnt too confusing )

I've read the Fuse and switch cleaning suggestions. However the seat back will move forward on it's own so I know there is power,
I am assuming that the seat control switch is shorted out and I am looking to source a replacement.

Does this sound reasonable? or does anyone have any other Idea's?

this is what I have come up with so far and will be checking :

http://www.pairlist.net/pipermail/r1...il/001735.html


Thanks All in advance !
Greetings. Posted in hopes it may assist...

VEHICLE: 1995 SL600

SYMPTOMOLOGY: DRIVER'S POWER SEAT MOVES FORWARD/TILTS FORWARD ON ITS OWN WHEN IGNITION IS TURNED ON AND DOOR IS CLOSED AND DOES NOT STOP.

BACKGROUND: (5) DIFFERENT SOCAL MBZ SHOPS HAVE ATTEMPTED REPAIRS UNSUCCESSFULLY - DISCONNECTING POWER SEAT SWITCH HAS NO EFFECT.

REPAIR HISTORY: POWER SEAT SWITCH AND POWER SEAT CONTROL UNIT RECENTLY REPLACED WITH BRAND NEW MBZ COMPONENTS - NO CHANGE.

TECHNICIAN'S FINDINGS: REMOVE SEAT FOR TESTING. CONDUCT PIN-BY-PIN TESTING. DISCOVERED FAILED SEAT BACKREST RELAY MODULE (DRIVER'S SIDE) PART # 129 821 00 47.

ACTION TAKEN: REPLACED MODULE # A 129 821 00 47. SEAT NOW FUNCTIONS NORMALLY. ALL THREE MEMORY PRESETS CAN NOW BE PROGRAMMED.

TOTAL TIME CHARGED: 5 Hours

Last edited by Akbar Service; 09-20-2017 at 02:20 PM.
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