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#1
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Battery drain problem.
'87 300SDL. Constant battery draw. When problem first developed I traced it to the left front seat adjustment circuit. I adjusted the seat and pulled the relay and all was well.
THe problem is back. Pulling the #15 fuse stops the drain. I checked the seat adjustment switch and there is still a drain with plugs on the switch pulled. The memory function hasn't worked since I have owned the car. Question is where is the memory module (relay?) and is it powered all the time. Thanks, Tony Last edited by tcom; 02-28-2020 at 09:27 AM. |
#2
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The seat controller is under the seat. Yes it is powered at all times so that the seat may be adjusted with the key off.
__________________
Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) |
#3
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Thank you Eric, I figured you would have the answer for me.
I'm searching for a new controller. I don't believe an OE part is available, so pre-owned may be the only option.When I find one I'll install it and let you know the result. It may take a week or so to get back to you. It will be nice not to have to disconnect the battery when the car will be parked for for a day or more. Same for doing without the accessories controlled by the #15 fuse. Tony |
#4
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Is this a car you're driving daily? If it isn't, you may raise the seat all the way and try disconnecting the chassis-side plug from the seat module underneath the seat and leave Fuse 15 installed. If the power drain goes away, you know you found the problem.
__________________
Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) |
#5
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Hi Eric,
THe MB isn't my primary transportation, however I drive it for trips longer than twenty or so miles and trips out of the area to visit friends in southern Oregon. The beer store is less than a mile away. Grocery getting is an eleven mile turnaround. RIght after I posted a response, and knew the location of the module I disconnected it. The drain disappeared. The module is available OE, remanned and used. OE from the Fatherland $1500, re-manufactured, exchange from ProgRama $195, and finally, eBay (where else?),prices ranging from $60 to $159. I found a module at BMW All Parts for $60 plus shipping. If the used one doesn't work, I'll send it in for repair. Not cheap but not the end of the world. I hope this information along with your contribution helps another owner experiencing the same problem. Tony Last edited by tcom; 03-03-2020 at 12:49 PM. |
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