I have had a lot of problems with my car and this next one is the battery draining overnight, I changed the alternator and the ibs module but it still continues also most of the times I get an error code 4661 supply voltage, here in my region we don't have many professionals and they can't solve it. Please help me!

 

You could have a parasitic drain somewhere. See, Is My Battery Bad? - 5Series.net - Forums.

 

I have checked almost everything and I wanted to know if the glow control unit can cause this battery discharge because some time ago I had a loss of coolant and the tube that had the problem was exactly above the glow control unit and a large amount of coolant fell on it

 

Lots of things can cause a parasitic drain. You will need to isolate the root cause.

 

Any module can produce a drain. You need to perform a parasitic drain test to isolate what is draining the battery if there is indeed a drain.

 

solved! the battery drain i think was coming from the lcm module above the brake pedal after i checked for anything suspicious there i saw a large amount of water had fallen on the lcm module which i don't know how it got there

 

That would do it. Now you need to find the leak and plug it and get a new module then program and code it.

 

Does your vehicle now go to sleep?

 

the vehicle went to sleep but the lights on the door buttons did not turn off

 

I understand, I think the water got in through the door rubbers, they close properly and smoothly, but when I moved them by hand, they didn't have adhesive, maybe the water got in from there