Thread: window control d4

Originally Posted by stuarth44

searched the site but did not find an answer
been AWOL here with major health stuff, and even had a chopper ride to Royal Brisbane Hospital, digressing, sorry
my d4 201o has an issue with the driver's side window/mirror control, fault says lost communication BCM. fitted new control, checked fuse number 32,had the door card off 4 times now, all of the other window switches work
been parked up now 2 weeks, British Offroad are booked 7 weeks in advance.
Any help appreciated

Is it possible to check the power with a multi meter where it enters the motor and also where it enters the switches? I’m thinking that way you know of is getting into the switch and also into the motor

Originally Posted by John_D4

Is it possible to check the power with a multi meter where it enters the motor and also where it enters the switches? I’m thinking that way you know of is getting into the switch and also into the motor

thanks, it is pretty hard to check, one needs to make up very thin probes, but I am sure that there is voltage up there, I will go make some probes, I do have a Fluke clamp meter, probes are too heavy but will grind some old probes down, everything is a mission as i lost most of the use of my left hand,
thank you for replying

only 3.6 volts, not enough to light up the lil' red light

I really don’t think that 3.6v is enough to power the motor. My thoughts would be:

1) poor connection on one of the connections (corrosion or a pin has come loose)
2) a power wire has rubbed through and is partially earthing
3) faulty switch - check the pre switch voltage
4) bad connection at the fuse. Check voltage at the fuse also.
5) bad earth, although I can’t see why any other part on the circuit would be earthed except the window motor and the battery
6) can you check the voltage on one of the other window motors that work fine?

Can anyone else think of some other reason?

How to test a common ground power window motor from a classic car - YouTube

Originally Posted by John_D4

I really don’t think that 3.6v is enough to power the motor. My thoughts would be:

1) poor connection on one of the connections (corrosion or a pin has come loose)
2) a power wire has rubbed through and is partially earthing
3) faulty switch - check the pre switch voltage
4) bad connection at the fuse. Check voltage at the fuse also.
5) bad earth, although I can’t see why any other part on the circuit would be earthed except the window motor and the battery
6) can you check the voltage on one of the other window motors that work fine?

Can anyone else think of some other reason?

How to test a common ground power window motor from a classic car - YouTube

John, thanks, I reckon it is the can bus signal, the switches cannot even begin to activate with so few volts
I'll have a look at the things you've touched upon tomorrow

darn, getting nowhere, stripped the old unit, was burnt at the main lock all switch, vdc at fuse ok, vdc at window 3.6, run outta ideas

download 7 dollar 700 page wiring book
showed me fuse 40,
fuse 32 which is the module one of 25 amps was ok
fuse 40 is 5 amp, relaced it all good, dismantled old switch, big burn in there

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