W211 weird problem

[ReeceAMG]

Hello all I bought a w211 e55 not long ago and some stuff has started happening.

Bought the car at the beginning of summer and all was fine until about a month ago. Once the weather turned and rained for days the parking sensors are intermittently working. Sometimes they flash orange when driving and the command system will mute the radio. Other times there are red lights and others no lights. When going slow all the door electrics go off on every door. No windows or seat adjustment or even switch illumination. They will come back working after a minute or so if I drive away. If I switch ignition off and back on they start working. It sounds like water getting in somewhere from the rain. I took the front parking sensors out and sprayed some contact cleaner in but made no difference. Also if I leave the car for anymore than a full day the battery conviniece disable come on the dash despite having the battery checked it was OK. Anyone shed some light on this issue

 

[Fununcle]

Sounds like water getting into the fuse box or sam to me, but someone more knowledgeable than me will, I'm sure come along soon.

 

[AMGeed]

1. Have you checked the aux battery under the pollen filter in the engine bay?
If its not been changed in a while, you could still have the original battery which is probably not holding the charge and bringing on the battey convenience message.

2. The above post sounds a possibility. Check the water drains under the windscreen wiper scuttle. If blocked you could have water entering the cabin area and affecting the from sam.
A good seesion with Star diagnosis should be able to rule out a faulty sam. You can also check for any faulty parking sensors with Star.
You need to find a good indy that has Star. The main dealers charge silly money for Star diagnosis so avoid if possible.
Check the fuse box in the engine bay to check for any damp or corroded pins under the fuses.

3. Take a look in the wheel well in the boot and see if you have any water ingress. It can enter the boot through worn rubber seals around the boot or either of the rear lamps.

 

[merc85]

Water can leak in from Weld where the Bulkhead is welded to the inner wing leaks down into the Nsf floor the scuttle will need to come up to check this area.

Pull the mats up in the nearside front foot well and check for damp the above will probably be the cause of the weld not being sealed properly.
There are about 5 ecu's behind the passenger foot well insulation.

They can leak where the Sunroof drains connect at the top of the windscreen so pull the Interior A pillar off and check there.
Check the Rubber channel that connects to the centre scuttle is connected, and exits the nsf wheel arch housing, the large bore rubber pipe can become disconnected.
Also take the aux battery out and clear all the dead leaves from that area, also the heater valve area suffers the same but harder to clear out unless you are changing the Valve itself.
They can leak around the plastic boot seal trims these crack and let water in.
Around the boot Star
Around the rear tail lights, the Rear Sam is above the NSR wheel arch within the Rear wing, there a vent which exits behind the bumper check that area to.

Hope the above helps

 

[ReeceAMG]

all is good, it turned out to be the voltage regulator on the alternator was bad

 

[ReeceAMG]

changing the voltage regulator worked for about 2 months then I had to change the alternator itself cos it gave up