[W126 Coupe] Long term Battery drain problem

[Steve Nervig]

On Mar 13, 2006, at 1:48 PM, Vance Rowley wrote:

> Well Guys, looks like we are aiming in the right direction. As on  
> my previous post, you will know I have replaced fuse #2 which it  
> was confirmed with this removed the battery drain stopped, but  
> removed Relay "B" from the fuse box, which is just one of the many  
> circuits fed by fuse #2. According to the info I have, this relay  
> is a combination relay which controls 1. Turn Signals, 2.Hazard  
> lamps and 3.Wiper /Washer. Bottom line is without this relay  
> plugged in, the battery does not drain. Trouble is everything  
> seemed to be working as it should when the relay was fitted. So now  
> it comes down to either the relay unit itself is causing this  
> intermittent current draw, or one of the circuits that it feeds.
>
> I started up the car today without the relay to check exactly what  
> was and wasn't working without it. I found that even though the  
> manual says that this relay controls the wiper/washer, the wipers  
> themselves actually worked but would not self park. The washers  
> also worked as well. So I guess from the description from the  
> manual, it means only literally the Wipe/wash function as when the  
> washers were activated the wipers didn't wipe. The power seats are  
> working too without this relay, so it looks like that is now ruled  
> out as well as the other circuits that fuse#2 feeds. However as  
> expected, the turn indicators and the hazard warning lights don't  
> work without this relay. What was unexpected, as it isn't listed in  
> my manual is that the rear screen heater doesn't work without this  
> relay either.
>
> So I suppose I will have to keep my fingers crossed and try again  
> after replacing the relay and hope that this is the equivalent to  
> Steve's reset of the module on a 124. Otherwise, I am not sure  
> where to go next if that fails, as all of the circuits that are  
> currently not energised without this relay, all seem to work  
> perfectly with it (except for the fact it drains my battery with  
> this intermittent current draw)
>
> Anyone any ideas where to look next? or should I just buy a new  
> relay and hope that it's the relay itself?
>
> Cheers,
> Vance.

Vance, why not open the relay up and check the 'points' in there.  
Maybe they are corroded and/or sticking. Cleaning the contacts might  
work. Worth a try.

Steve