wywywywy

Hi all,

After unlocking the car and opening a door, the interior light is supposed to stay on for a while, so that you can see when getting into the car.

However, on mine it goes out after maybe 2-3 seconds.

The door switch and the light itself seem to be working fine, just the timer isn't.

In my dash this option is set to 60 seconds.

Any idea where do I start diagnosing this problem please? Is there some sort of timer relay that controls this?

This is a pre-facelift 2007 W221 S500.

Thanks.

DaveW68

The interior light should actually stay on until you close the door. It should shut off a few seconds after closing the door or once you start the car. The settings in COMAND control how long the interior and exterior lights stay on after you use your key to lock or unlock the car, or how long the interior lights will stay on after you turn off the car. You do not have control over how long the interior lights stay on after you open then close the driver door.

It sounds like yours are working properly.

wywywywy

Sorry I mean that the lights go out after 2-3 seconds without even closing the door.

So they are not working properly.

I didn't know the setting is for after turning off the car though. Thanks for the tip.

Tomino

It is the problem with battery. I had exactly the same issue. You schould try to charge battery by external charger, it should help fore some time. After battery replacement my problem is gone.

wywywywy

Thanks but my battery is quite new.

Still I'll give it a go and report back!

Thanks for the suggestion.

Tomino

Maybe it was coincidence in my car, or reset due to few minutes without both batteries. I remember that the issue occured only when engine was off and disappeared when external charger was connected. What is the voltage shown in "hidden menu" in your car when the engine is off?

wywywywy

After 24 hours of charging, it's fixed! Thank you very much Tomino!

I guess short trips and cold weather and every heater on full blast for the last 2 months hasn't been kind to the battery!

BenzV12

Great to see that niggling thing is fixed

crxpaul

I have the same issue, which battery needs charging? the one under the bonnet or the auxilary battery in the boot?

Thanks

wywywywy

The auxiliary battery