How do you diagnose a master window switch that works sometimes and sometimes it does not work.

10

Asked by Sep 24, 2013 at 04:00 PM about the 1999 Volvo V70 Wagon

Question type: Maintenance & Repair

Sometimes the master control window switch works and sometimes it does not work.
which leads me to believe there is an electrical problem. How doe you diagnose this
problem?

7 Answers

the wiring harness through the door would create an intermittent condition...sometimes there sometimes not...when the weather gets cold things contract...warm they expand...will shop for a harness for the driver's side...I imagine~

1 people found this helpful.

okay here's a USED one for fifty bucks....we can do better...rockauto.com will serve~ with reasonable prices~

10

Judge_roy. Thank you for your answer. this wiring harness looks like a non mechanic like me can install it correct?? From your answer I assume that you are talking about replacing the wiring harness on the drivers side left front door. Is that door panel easy to take off and put back on???

1 people found this helpful.

You will have to consult the Technician's Handbook on that one...could check a few blogs...let you know if any of the info escaped from the tech manual~

10

it's the switch's connections, not the wiring harness. Over time the get a coating. Pull out the switch and clean all the contacts. This is usually the problem. They switches also go bad. I replace mine with a new one for $100 (do gogle search).

1 people found this helpful.

of course TEST any component you may be replacing~

10

Pull it out. Disassemble. The circuit board just below the switches has contacts that are closed when a rubber thingie presses at them. They, like all contacts, oxidize with time passing. Scrape them GENTLY with the blade of a thin flat screwdriver until black turns copper-y. Put it back together, reconnect, reinstall. Works for my 2002 V70XC. Your mileage may vary.

1 people found this helpful.

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