Smoke from Electric window master switch

Griffmeister · Messages: 146 Registration: 07.16.2002

Have been having intermittent problems with the window master switch for quite a while (would'nt operate any windows), so I decided to check the relay, when I operated the switch to listen for the relay clicking the drivers window operated but smoke started coming from the front of the master switch. I took the switch out to check it but could see nothing obvious wrong with it (no charing or pitting on the terminals). Luckily I had a spare master switch which I have now fitted and everything seems ok. Any ideas why the previous switch started to smoke?

moku · Messages: 250 Registration: 11.20.2002

maybe it jus wore out and simply was just overheating, how old is the car, it could be the factory fitted relay !

DBinMV · Messages: 87 Registration: 10.03.2003

Its a 99 V70 so I suppose it is possible it could of wore out.

salvia.D · Messages: 3,490 Registration: 10.09.2003

I had problems with my switch and looked at replacing it. I was lucky, a generous board member supplied one for a drink. They are often found on e-bay, or from a decent breakers

johans121 · Messages: 232 Registration: 07.15.2003

Malc-c Luckily I've got a good friend who works at a breakers so it did'nt dent my wallet.

fredo · Messages: 3,230 Registration: 04.30.2001

Pangster is spot on but you need to do more than just clean the metal strips and the contact points. Take a small flat bladed screw driver and scratch/rough up the surface of the contact points and the end of the metal strips where they make contact (switch should be disconnected when you do this). Reassemble unit, reconnect switch and it should now work.