[W126 Coupe] Long term Battery drain problem

[Vance Rowley]

Hi Steve,

 Thanks for your input. With the length of time this has been going on, I won't dismiss any possibilities. The car is a 1991 Euro 560 SEC (LHD), so I am not sure where the equivelent module will be on the W126. As I mentioned, I have currently removed one of the relays in the fuse box and replaced fuse#2. There is another one to try if this one proves not to be the cause which is relay "H" which is listed in the manual as Power Seat Relay. I don't know if this would be the same as the unplugging of the module you mention. I doubt it, so if you (or anyone else for that matter) know where and if this equivalent module is located on the W126, then let me know. I will certainly give it a try.

Thanks again,
Vance.


----- Original Message ----- 
From: "Steve Nervig" <dakota at mac.com>
To: "Vance Rowley" <vance.rowley at tiscali.co.uk>; "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
Sent: Sunday, March 12, 2006 5:54 PM
Subject: Re: [W126 Coupe] Long term Battery drain problem


> 
> Well, Vance, I can relate to your frustration, because I've had a  
> similar problem with my W124 coupe for about 5 months. Battery drains  
> after about three days of sitting. We may have found it just this  
> week, and your mention of the comfort circuit caught my attention.
> 
> On the 124, there is a comfort module, N52, sometimes called the  
> convenience module. It's a relay that ties into a multitude of  
> different systems, including seats, belt extenders, overhead lights,  
> etc. On my car it is located underneath the left rear seat bottom. It  
> has five different connectors going to it.
> 
> We disconnected it and reconnected it, and it seems to have stopped  
> the drain, although I am not positive. My indy's theory is that some  
> of these electronic modules will sometimes reset if you disconnect  
> them. Don't know if that is a valid theory, but I know of one other  
> case (also a 124) where the same type of battery drain was happening,  
> and disconnecting and reconnecting the comfort module fixed it.
> 
> You didn't mention what year and car you have.
> 
> But in looking in the 126 manual I didn't find a similar module/ 
> relay, so I don't know if this scenario applies to your car or not.  
> But I thought I'd mention it.
> 
> Regards,
> Steve Nervig
> 1992 300CE Sportline
> 
> --
> If you don't know where you're going,
> any road will do.
> 
>