MattiasPoul

Hi

I've had my SL55 for 6 months now, and I've experienced this four times. Two of the times is today and two days ago, so I'm getting worried..

All electronics seem to be ****ed up, windscreen wipers are wiping (until I turned off the "auto"), CD changer is changing CD's, all icons turning on and off, speedo + rev counter going to zero and up again.

After a minute or so, it stops. It also stops if I turn off the car and turn it on again. After turning it off, no malfunctions are stored.. Anyone else ever experienced this?

I've uploaded a video of the issue here: (it's better around 00.25 and forward)

alx

sounds like instrument cluster ground.

or main battery is getting weak...

JadAwada

change your battery, if the problem remains, you got to take your car to a workshop..

I recommend using Varta Battery E38

ttboost

Yep..weak battery causes more problems than can be listed here...

MattiasPoul

Replaced battery (even though battery test showed no problems at all) and no problems ever since. Thank you guys.

dRockSL55

Thanks for updating this thread, will help anyone trying to figure out this problem in the future!
Do you keep a battery tender or trickle charger of some sort on your SL?
Amazing how many problems a weak battery can cause in these cars. I wonder if it would be worthwhile to install a real voltmeter (vs reading it over obdii via scantool) somewhere unobtrusive or hidden, just to see what the voltage really is when wierd issues like this crop up

MattiasPoul

Problem is, as I wrote in the first post, it was - for me at least - a very periodic problem, with weeks and months between the occurrences. But glad it's solved now. Did not fit any measuring devices at the moment of the issue, so really, I have no diagnose, other than I haven't experienced it again for a year now.

I never drive it throughout the winter, so during winter months, I do attach a battery charger to keep it fresh and in good conditions during the 5 months it's parked.

MattiasPoul

And here I am, Almost a year later, having the exact same problem. It does seem more frequent now, though, and doesn't stop just from turning car off and then on again like last year. I'm not really thinking replacing the battery is my key problem here? Might help, but again only for a short while? Worth testing I guess.. Any suggestions for my next move?

kustom2k1

Find out which modules control the electronics your car is having issues with. Example would be the SAM module.

coldwell

Do you have any aftermarket things connected to the fiber optic line. Have you modified cars electrical system at all??

MattiasPoul

No, the car is completely original. At least to my knowledge, bought it at 65k miles (now done almost 90)

Will try to do a complete readout of errors etc this week, but last time I had this problems it showed only the errors that is also fysically visible (wipers going, ABC error, ESP error, CD changer error, airbag errors, light errors etc), nothing that was very helpful. I will look out for any errors related to the SAM module.

I'm not driving to the dealer to have it fixed since I really dont like my local arrogant one - maybe I should try that? Would they know more?

MattiasPoul

Here are the error codes I got from a complete readout.

Related to an gearbox issue, which is now fixed (conductor plate):
P2066
P2069

P2003

ESP errors:
C2230
C2210
C1C18
C1C16
C3211
C1B14
C1B03

ABS:
C2258

Aircon:
B1269
B1057
B1091

SAM EV 2 OBD:
B1088
B1076
B1074
B1026
B1078
B1075
B1057
B1021
B1091
B10FF

SAM FH 2 OBD:
B1088
B1059
B1026
B1078
B1057

SAM bag 3 OBD:
B1013
B1074
B1059
B1091
B1026
B1057
B1088

UBF 2 OBD:
B1074
B1088
B1059
B1057
B1091

Door control unit FH dig. 2 OBD:
B1208

Gear EGS dig. OBD:
P220A (probably related to now exchanged conductor plate)
P2500 (probably related to now exchanged conductor plate)
P2314
P2315

ABC:
C1525

Tire control survailance:
B1043
B1074
B1353 - right rear wheel.

As I said, a whole lot of errors. I do not believe the error is related to the gear issues, since I had no problems with my gear box last year.

It is to be said, I have now driven around 1000 miles with no problems at all. Have not done anything. Did readout and deleted errors in the car computer about 500 miles ago.