W211 Clock and trip computer not working since Battery change

[Nailzy]

Hi chaps

I have swapped out both batteries on my W211 Merc after getting the Convenience functions temporarily disabled after a cold winter on cold starts - those problems have since cleared

However since doing the battery changeover - the analogue clock on the dash has frozen to the time I disconnected the batteries - and the trip computer (the one next to the KM/H static readout) - always resets back to 25.5 miles when I come back to the car. If I start a journey and reset the trip computer using the button - it reads 0.0 but does not go up at all during the journey..... and will always reset back to 25.5 after locking up and coming back

Somethings obviously gone a bit crazy - the COMAND Time is set correctly and GPS is picking up the time and the date. Disconnecting both batteries for an hour and resetting does the same - analogue clock still frozen and trip back to 25.5miles

Anyone have any ideas? On my instrument cluster theres no option for Time sync or anything like that as per other posts I've seen.

 

[John]

That's a bit weird. My clock froze today as well on my W211!

I haven't done any battery swappage.

I've not figured out a solution yet but I'll let you know if I do...

 

[John]

I knew I'd seen something on this:

http://www.mbclub.co.uk/forums/electronics/141260-clock-lost-40-minutes-w211-my2004.html

For me - my main battery has been dicking around for a while now and I guess it has hit an all time low now...

:fail

 

[Nailzy]

Still doesn't help me though - I've got new batteries and done the battery reset procedure countless times and the problem still exists.

Also whilst powering my laptop whilst in the car I noticed my front cigar lighter wasn't working but the fuse in the engine bay was ok - feared the worst and thought front SAM going crazy or something. The cigar lighter issue was unrelated - the actual unit itself is broken and has come away from the ceramic at the back. New part is coming tomorrow. I also managed to trip over with the entire ashtray assembly on the way back into the house - springs and coils everywhere. However managed to find everything and put it back together which I'm quite proud of - should have written a guide as it took ages!!

In other news - my issues still exist - time is frozen and the trip computer still reads 0.0 or 25.5 after another battery reset. There is another problem too - the actual ODOMETER is frozen. My mileage does not go up during driving. The trip computer that gives you MPG after reset / after start works correctly though....?!!?!?!

 

[John]

Ah yes - missed that you'd done that.

Not sure then.

I'd be taking mine to my inde in those circumstances!

 

[eugekav]

complete instrument failure w211

HI, It seems to me that there must be a procedure for replacing the battery or both of them. I have total instrument failure and keep jumping between this forum and you tube . There is a member of this forum that repairs instrument clusters so that would be my next port of call after trying to reset the cluster by removing the earth strap from the battery. I shall try to back track to previous posts and put details here. .Thanks for your time .Eugekav

 

[eugekav]

helpful info found

Hi, The handy info I have found about instrument cluster failure on w211 comes from thread name DEAD INSTRUMENT CLUSTER and the reply by WG M-B advocates reset by earth strap removal then test cluster .I am not sure of this procedure yet and by removing battery has caused you problems so I am being cautious and finding out as much info as possible before I try to reset cluster. If this does not work , member JAYMANEK provides a cluster repair service that hopefully I will not need. Once I have removed strap for a period of time as WAYNE GATES suggested in the thread DEAD INSTRUMENT CLUSTER. Post No.#5. I will learn to link back and quote from previous posts one day in the meanwhile I hope some of this might help. Good Luck Eugekav..