Electric window issues

[beau]

Windows were working fine before it went to the bodyshop

Got the car back at my house now and drivers window works but it doesn't go all the way up and when you close the door it's not dropping / micro switches not working

And passenger side isn't working at all, it's showing a constant 8v to the motor ? When press switch the control box is clicking but doesn't seem to be doing anything at the motor so stuck

 

[conaero]

I have seen this before when the battery dies. I would try a couple of battery resets first and make sure you have good charge.

It sounds like its confussed...and rightly so considering all the trauma its been through of late.

 

[beau]

Ok, done some testing, one side is getting 12v(14v running) to the motor and that's working, the other side is only getting 6v(8v running) and it's not working

It's the earth which is at fault, because if I run a better earth to the motor it works, of course because the motor works by swapping the polarity to make it go either way I can't just run a new earth in, and it's poor earth is coming like this out from the control unit (but other side earth is fine)

Any ideas?

 

[2b1ask1]

Beau, access all the connectors and look for corrosion first port of call. You have clearly isolated the problem to the earth side so it should be possible to resolve. Is this CAN-BUS? If not it should be practical th run a new or bypass cable.

 

[hodroyd]

I would check connectors too, if all else fails it's a new earth wire from the control to the motor..!!

 

[beau]

The box uses the same power/earth to feed both sides though, and it's only getting 6v directly out the control box for 1 side only (same as at the motor)

 

[hodroyd]

In that case there is a junction (split) in the feed somewhere to go to each side, you need to find this as that could be the problem..!!

 

[beau]

I'm still having no luck with this does anyone know how the car knows when the window is at the top so it needs to drop when the micro switch is open/closed?

 

[Contigo]

I had a look in the workshop manual but there isn't a massive amount in there apart from some serious wiring diagrams which I don't have the time to decipher right now. I did find this on "another" forum and it is worth a check. Failing that there is a window ECU which might be duff and these can be replaced.

"if the switch cleaner does not work try this, remove the inner door trim. The top part comes out first ( the coloured insert with the little speaker at the front ) then the main body of the door trim. Once all this is removed you can see the metal frame of the door with two plastic or polythene membranes, in the middle of the door frame above the lower membrane is a square of black 'gaffa' tape covering a square hole about 5 cm x 5 cm . Remove the tape raise and lower the window and you can see the micro switch and 'cam' that operates it. The 'cam' has two 8mm bolts and can be moved to that allow adjustment. If you don't hear the micro-switch click as the window reaches full up position then trial and error adjustment is needed . If the micro-switch is not operated by the 'cam' then the door glass will not drop when the handles are used, or drop down when the window is raised and the door is open. The Maserati manual suggests a drop of 15mm to allow the door to open. At the same time try using some white spray grease through the hole it may save you having to remove the water proof membranes that can be difficult to reseal ( i used black silicone from an auto body shop). This takes about 1.5 hours form start to finish."

This makes sense to me and it could be that your cam needs adjustment. Please let us know how you get on with it Beau.

 

[beau]

Hi, thanks for that- it does sound like that is my problem, the windows are clearly misaligned because when I put them up they go past where they should, ie they go about 1cm too high past the door and make a not very nice 'crack' noise, so by reading that there is a micro switch to tell them when they are up, clearly it is missing this

 

[Contigo]

Here is a really detailed thread about how there are four microswitches and how they all work. It takes a bit of reading but I reckon you should be able to determine which one is faulty.

http://www.sportsmaserati.com/showt...p-function-(4200)/page2?highlight=microswitch

Page 2 and 3.

 

[Contigo]

So, the window system first of all checks the sensor I found near to the airbag to see if it's the contact position (window fully closed) or open (window open).
If this sensor is detecting the window is fully closed, when you start to open either the inside or outside door handle the system will dip the windo until this sensor is in the open position. When you shut the door, the sensor in the door lock detects the engagement of the door latch and fires a signal to raise the glass untill the sensor by the airbag closes thereby letting the system know the window is fully shut.
If the sensor near the air bag detects the window is already open (because the contacts of the misroswitch are also open) the window dip doesnot operate.
Likewise, when you raise the window using the button on the dash, the system detects when the glass is fully up when the micro switch by the airbag closes.

So: Microswitches in both door handles to detect door opening, microswitch near the airbag to regulate the window position and micro switch in the door lock to detect door closed (this also seems to operate the cabin lights too).

Mine is a 2002 car, so possibly different to later ones, but I have seen pictures of a later car with the same bit of black tape covering the hole where the sensor by the air bag is situated.

Simples.

 

[hodroyd]

I once had an issue like this on our AC when the battery had gone flat. I decided I would try and reset the windows: I turned off the power for 5 minutes, turned it back on, then lowere and raised the windows several times all the way up and down, when finally down I shut the door with me inside and lifted the windows up, then down again and up again. I then went to open the door and the windows dropped to the correct spacing, closing the door sent the window back up again..!! It's worth a try..??

 

[Contigo]

Yes Robert there is a reset procedure and that may well be it. Finding it is not easy!!!

 

[beau]

That's a great help, I'm hoping it will all be ok then once aligned back up, just really annoying with everything I have done to this car, it's the little finishing touches that are proving to be a total pain ! I literally haven't even looked at it in months because I just lost all interest in it, my mate finally managed to encourage me to look into the window problem again Saturday though, so fingers crosses I can get this sorted Asap !

 

[highlander]

I know the reset procedure for alfas and fiats is engine on and hold buttons for both windows till down all the way holding the buttons down for a further count of 5 or so then raise both together.........guessing masers will not be much different?