Battery drain cause electrical problems
Found some water in battery room about one gallon.
Last edited by maxsprint; Apr 10, 2016 at 09:17 PM. Reason: Explanation
Found a "motor" under the spare tire.
This Trunk Lid Hydraulic Pump was corroded. Because some how water has been accumulating around it.
How to test this unit? Any ideas?
I took it out of the box, it was wet








Trending Topics
Maybe I'll just explode my MBox 😈
The Best of Mercedes & AMG




Today I tested the motor (for tailgate ) and it's working! But red buttons on the gate don't light up, doesn't lift nor pull it shut. The other one that locks the car works, but only by locking the doors, not by automatically shutting it closed. How can I test the module for the lift gate, instead of just buying a new one? A1648701126
i did not have the water issues so your stuff sounds more complicated
i know the ML is very prone to have water leaks around the rear taillights and that the rear sam had to be replaced on a lot of them
think there was even a recall on this
just found a major leak on my E Class this week and it turned out to be the 3rd/upper brake light in the trunk lid, when diagnosing this my mechanic mentioned mercedes has a lot of problems with leaks on this part and even the trucks do it too
if it was me i would start by checking the tail lights and the 3rd brake light
I have the exact thing going on.
One day my tailgate motor stops but can open manually and then 2-3 days later my battery goes dead and my Air Valve Block is trying to engage even with car is off. I believe this valve air block engaging and shutting down every 10 seconds is killing my batter.
I just had the valve air block replaced w ith a new one $400 and still the problem, so I googled GL450 Battery drain and found this. I have the exact same symptoms.
There is no issue with the airmatic struts.




