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Re: Punto Electric Window Fault
[Re: MeanRedSpider]
#1584603
15/09/2016 12:08
15/09/2016 12:08
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Joined: Dec 2005
Posts: 8,417 Lightwater, Surrey
DaveG
Club Treasurer Member 311
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Club Treasurer Member 311
Je suis un Coupé
Joined: Dec 2005
Posts: 8,417
Lightwater, Surrey
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When you say the motor works fine, you mean on the driver's side when you apply 12V direct to the terminals? And when the motor works the window goes up and down OK?
Do you measure 10V at both terminals when the motor is connected to the wiring loom? If you separate the connector, do you still see 10V at the connector?
Have you pulled out the relay, tested it, tried another?
Can you post up a wiring diagram? Is it a proper FIAT one or a Haynes type of best-guess diagram?
1996 Portofino 20vt & 2000 Pearl White Plus 1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
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Re: Punto Electric Window Fault
[Re: MeanRedSpider]
#1584609
15/09/2016 12:43
15/09/2016 12:43
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Joined: Dec 2005
Posts: 8,417 Lightwater, Surrey
DaveG
Club Treasurer Member 311
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Club Treasurer Member 311
Je suis un Coupé
Joined: Dec 2005
Posts: 8,417
Lightwater, Surrey
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Does the diagram look like this? (from Haynes by the look of it) It does in indeed show one relay supplying both windows via "dash panel switch assembly" which musty be Haynes-speak for a little central electronic module that controls various functions. For my wife's Volvo V40 I have just bought a second replacement CEM to sort out the headlights: there are mini-relays or connections inside the CEM that stop working, and whilst repair is possible, modern-day soldering (with lead-free solder and miniature components) is beyond my capability (tried it and generally failed). The solution may be a new "assembly" box (from a scrapyard). That diagram is the first I found and is for a Punto rather than Grande Punto, although I suspect they are similar. Have you checked the Fiat Forum at all?
1996 Portofino 20vt & 2000 Pearl White Plus 1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
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Re: Punto Electric Window Fault
[Re: MeanRedSpider]
#1584611
15/09/2016 13:33
15/09/2016 13:33
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Joined: Dec 2005
Posts: 8,417 Lightwater, Surrey
DaveG
Club Treasurer Member 311
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Club Treasurer Member 311
Je suis un Coupé
Joined: Dec 2005
Posts: 8,417
Lightwater, Surrey
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This PDF has the proper FIAT diagrams like the Coupe, again for a plain Punto, 2 pages for electric windows (17,18) and check last two pages for component names (no wiring colour code however, but they'll be the same as the Coupe I think). There is a window ECU (155) which looks to be just for the windows and nothing else, and perhaps interrupts the power to the switch when the door is open? But beware, this is for a Punto, not Grande Punto...I will keep looking... Try testing the connections to the switch. If my memory of italian colours is correct, there should be a black cable (N) for earth, red (R) for power +12V when ignition is on (and perhaps when doors are not open?) and the other two should have nothing normally. When the switch is pushed to open, one should be +12V and the other earthed, and vice versa when the switch is pulled. You may be able to swap the window switches on the driver's side (those for the driver and passenger windows) to test, but the connector shapes may be different.
1996 Portofino 20vt & 2000 Pearl White Plus 1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
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Re: Punto Electric Window Fault
[Re: MeanRedSpider]
#1584614
15/09/2016 14:08
15/09/2016 14:08
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Joined: Dec 2005
Posts: 8,417 Lightwater, Surrey
DaveG
Club Treasurer Member 311
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Club Treasurer Member 311
Je suis un Coupé
Joined: Dec 2005
Posts: 8,417
Lightwater, Surrey
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I think that Punto diagram is old school, with a separate single ECU for the windows. I've found a Grande Punto workshop manual via the Fiat Forum here but it's in Italian In section 9.4 "Alzacristalli elletricci" (page 474 of 534) it describes the electric window system, and it looks more similar to what I think you have. Is yours 2/3 door or 4/5 door? The 2/3 is understandably simpler than 4/5. However, you should still be able to test the signals coming out of the switch module when you try each window switch (still connected) by poking paper clips down in the holes where the wires enter the connector, and using your trusty voltmeter leads with croc clips) - but be careful not to short anything out...
Last edited by DaveG; 15/09/2016 14:08. Reason: corrected link
1996 Portofino 20vt & 2000 Pearl White Plus 1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
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