2004 e320 w211 intermittent no speedo, direction indicators, air con, windows

[rogerjames99]

I have an intermittent problem that is driving me nuts. With increasingly frequency my wife's e320 when started has no speedo display, no air con, no direction indicator function or display, no electric window function. All other displays on the central console e.g. air temperature work fine, and the engine starts and runs OK. So it looks like the central console module is still working OK, but power has been removed from the other systems. Could this be an issue with the immobiliser. Doing a battery disconnect reset restores everything to working again, as does locking the car leaving it for 20 minutes and unlocking it.

The first time this happened we thought it was caused by the battery failing. Fitting a new battery fixed things and the problem went away for a year. When it happened again my local mechanic said there was a problem with a slow battery drain. The local Mercedes dealer said the problem was in the cabin pre heater and it would cost £1800 quid to repair and £1500 quid just to disable it. I told them I would just keep the battery charged.

However, the problem has suddenly started happening much more frequently.

Has any one got any ideas on what is going on? Could it be an immobiliser problem? Maybe triggered by low battery voltage.

Thanks,

Roger

 

[brai]

Could the rear SAM unit be defective?

 

[WG M-B]

Where are you based?

 

[Cole@MBS]

Best part of a year old post, would hope he has it fixed by now

 

[television]

Some odd answers in the original post, some do not add up, up must say something sensible on STAR.

 

[WG M-B]

Best part of a year old post, would hope he has it fixed by now

Never noticed
Lol

 

[television]

Thats good, it sounds a horrible fault, I was on a forced holiday when it was posted