Question about Volvo 960

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The lights on the instrument panels as well as the radio flash at intermittent intervals. There seems to be no rhyme or reason as to when this happens (i.e. hot or cold car, bumps or no bumps, turns or no turns). Please advise.

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  • connold1 Sep 27, 2008

    I have a problem with my instrument lights. When it first started I started my car, the inst.lights came on for about 30 seconds and then went out. I could then turn the headlight switch on and off then the inst lights would come on again. this happened a few mornings and then they quit working altogether.
    I then replaced the headlight switch and that didn't work, I have checked the fuses and all of the fuses are good. I then removed the dash and checked the bulbs which was a waste of time because all of them would have burned out at the same time. I am out of ideas here can someone help? thanks

  • andYPIMP Oct 15, 2008

    rear window mist switch/heated door mirror not working

  • Anonymous Dec 08, 2008

    i Have the same problem. I also have a faulty pnp switch. Could this be related?

  • onroadjoe Dec 08, 2008

    I have the same problem. I also believe i have a faulty pnp. could this be related?

  • Anonymous Mar 19, 2014

    Doesn't matter if it's cold or hot out, sometimes when I hit a bump. Really no reason at all it goes to auxillary input and then all of a sudden will start working again.



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I had intermittent instrument light problem that went dark for months, until today. :o) I read somewhere that it could be the dimmer switch and didn't think that was my problem as the dimmer worked (dimmed the radio and transmission indicator light) and playing with it never seemed to help with the problem. I did find it odd that dimmer was not completely linear, as it would get brighter up to a certain point and get slightly dimmer with the last little bit of travel.

Today, I took the instrument cluster apart to fix a broken clock, sticking gas & voltage gauges, and to explore the instrument light problem. I took apart the dimmer switch, and to my surprise (was expecting a simple POT), it was a very complicated PCB with some IC's, resistors, transistors, etc. I thought, "all this just to dim the light???" Anyway, I found the POT (potentiometer) and gave a few squirts of WD-40 and found it turning smoother. After putting it back together, the instrument light came back and the dimmer is now perfectly linear. Apparently, less than perfect POT causes some sort of funny logic through the network of IC's and transistors and can cause the instrument light to go on or off randomly at certain intervals.

Anyway, I'm so happy to have the light back along with a working clock and not having to punch the instrument cluster to see how much fuel I have. Not really a posting type, but wanted to help someone else out there with a similar problem with same cause.

1989 740 Turbo

Posted on Jan 05, 2009

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The fuse contacts/fuse box just may need cleaning. Usually the fuse for the dash instruments is the same one that controls the seat belt light,heated rear window and the electrically operated sunroof switch. The radio uses a different fuse.

It sounds very much like a 'sticky' electrical contact somewhere. Try operating the dashboard lights dimmer switch as well ... that's the slider switch on the dashboard that dims/brightens the dash instrument lights.

Posted on Sep 19, 2008

  • jessemacia Sep 07, 2010

    on my '86 740 gle, radio, transmission lights work, sunroof works, its only the dash lights that dont work, checked fuses and they seem find, I'm baffled



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