Rear Turn Singnals Not Working SL350 Electronic Fuse?

[steveburden]

Hi I recently had the seal fail on a hard top SL350. Currently awaiting seal strips so I can sort this problem. I had a fair amount of water in the boot/trunk as it was sitting for a few days in very heavy rain. Dried the car out and all is food except the rear turn signals which the code I have informs me it is the electronic fuse. Have spent quite some time now searching for any information where this can be located on the car but not getting any where. Can anyone help in this issue so I can replace. Thank you in advance. Steve

 

[Trickythemerc]

I think the electronic fuse will be built in to the module that controls the rear turn signals. My knowledge of them is limited to a similar fault with one of my Fiat trucks, the fault was a water induced short circuit that caused rear lamps to fail. When working on the vehicle I grounded a live to the chassis and all the lights went of, thinking a fuse had gone I checked for a fuse in the box and found none blown ?? Tried the lights and on they came,fixed the short and all worked fine. Being the ever curious engineer, I grounded the live to the chassis again and out went the lights, waited two minutes, very faint click and all good again. This may or may not be your problem, water ingress is a hard one to deal with because it is by nature very searching and without lots of stripping out equally difficult to see exactly where it has got to.

At component board level it is normally a visual inspection that will show it across the tracks. If water or damp is trapped inside a component and can't escape, that's another story.

 

[steveburden]

I have just been playing around with the boot area taking relays out and looking at them. Car did not like it one bit. For a while I could not get the soft close boot to shut, the windows would not open the 10mm on opening or closing the door. I have had the car locked un-locked, made sure the relays I touched were sitting correctly in the socket then the boot suddenly soft closed the widows worked and the rear indicators came on. However it is still showing a bulb error on the dash but no bulb is out. I don't think this is the end of the problem.

 

[Trickythemerc]

Interesting development, this may be a clue to what is wrong. If it water ingress that caused the trouble it may be drying out, I would leave the boot open a gentle blow round the relays and fuses with a heat gun on very low temp. Don't overdo it and do it several times over a couple of days.

 

[steveburden]

The car is currently parked in my works warehouse with boot, doors and little hatches all out along with spare wheel and all tools etc. Also have the consumer battery on trickle charge. With this deluge of rain we are experiencing I can put the car out until the roof to boot seal is done. I’m awaiting day me 12mm x 3mm butyl tape and 6mm dia for the ends. After watching the MBowners club video on you tube. But right now fingers crossed it seems the car is all good but it want be going outside for a good week so I can really be sure it’s dried out. I may also treat myself to the MBII diagnostic device unless anyone can recommend a better one for sensible money.