seems the above is a relatively common issue. both batteries checked. rear all good, front aux replaced. still same issue. repalced voltage regulator on alternator. still same issue. comes on after 5 mins or so. goes off for 5 mins and then back - whats next logical step? BCM or Aux Relay?

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Profile picture for user MercedesMedic

You said that the batteries where checked. How did you check them? Also how old are the batteries?

Profile picture for user christopher
Alexnzo1, 2019-03-08

Load test by auto electrician. Aux was replaced

Profile picture for user MercedesMedic

I would check a couple of things. First make sure there is no loose contact at the battery terminals.

Second, I would still test the age of the main battery. It could be testing good, but that doesn't mean that it is providing enough juice for the power hungry Mercedes.

If it is none of these two, you need to connect a scanner and read the codes. Generic OBD2 scanner won't help and you need a scanner that can read Mercedes specific codes.

Let us know what you find out.

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