W211 e320 poss Sam issue? no washers and remote locking

[Te2800]

Hi all my e320 w211 has no sound from windscreen washers and also my central locking is random and fuel gauge doesn’t work even tho it’s pretty much full is there a issue with the sam and if so is it one in rear in the boot possibly also got coolant sensor visit workshop on dashboard to and service brake visit workshop .. thanks in advance .. also brake lights stuck on due to faulty brake switch ?

 

[AMGeed]

Possibly low voltage is causing some of your problems. Have you replaced the small aux battery under the pollen filter before? Get that checked and put the main battery in the boot on a 4amp min charge for 24hrs. The brake light switch is an easy inexpensive repair.

 

[Te2800]

I have issues with main battery going flat after few days but convienience functions are ok when I use everyday .. what does the small battery undervpollen filter operate ? And would this affect fuel Guage and windscreen washer issue

 

[AMGeed]

The Aux battery is back up for the main battery. Sounds like you either have a large drain on your main battery or its in need of replacing. Get your main battery tested under load to see if its holding a charge.

W211's, don't like low voltage and functions can shut down. Possibly your fuel guage and washers need a decent battery.