W211 E55 aux battery relay / control module?

[smoothcoupe]

Hi all can anyone please tell me where exact location of auxiliary battery relay and the battery control module is and how to check these please, as I am getting red battery warning.. in the past 3 months I have changed...

1. Main battery (genuine Mercedes)

2. Aux battery ( genuine mercedes)

Voltage regulator on alternator (genuine Mercedes)

Any help appreciated thanks.

 

[Tigger]

Hi all can anyone please tell me where exact location of auxiliary battery relay and the battery control module is and how to check these please, as I am getting red battery warning.. in the past 3 months I have changed...

1. Main battery (genuine Mercedes)

2. Aux battery ( genuine mercedes)

Voltage regulator on alternator (genuine Mercedes)

Any help appreciated thanks.

I'm pretty sure it sits in the boot - on a w211 e320 cdi, I vaguely remember the earth lead from the boot battery being linked to it so should be easy to find.

You can try a reset of the Battery Control Module itself by disconnecting the plug at the control unit itself for at least 5 minutes (caution: switch off the ignition beforehand).

If still no joy then I would suggest getting the diagnostic codes read.

 

[Sentralfyr]

https://mbwis.net/en/doc/18007726
https://mbwis.net/en/doc/7039382

 

[Sentralfyr]

https://mbwis.net/en/doc/18007726
https://mbwis.net/en/doc/7039382