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S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004. |
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Climate control panel and light switch lighting deadViews : 450 Replies : 3Users Viewing This Thread : |
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Sep 15th, 2018, 14:53 | #1 |
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Climate control panel and light switch lighting dead
Hi all, I thought I'd have a crack at changing the bulbs in my ac panel above the stereo and also the ones in the headlight switch panel as hardly anything works, so imagine my surprise after fitting new bulbs and it's exactly the same, the light switch side is completely dead, no light at all from any of the 3 bulbs and on testing with a multi meter I have 0v on all three, so that is dead, although it's just the backlighting circuit, the headlight themselves and fogs etc all work as normal.
Then into the ac panel, the left hand bulb lights up fine, the middle one is dead and reads 0v, and the right one comes on dimly, with readings that fluctuate between 3.5 and 5 volts, whatever could be going on here? Many thanks in advance
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Sep 15th, 2018, 15:13 | #2 |
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Update:
After some precision Emery papering I've got the right side of the dash panel lighting correctly and showing ~12v, the centre bulb holder and the 3 in the light switch are all still completely dead.
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Sep 16th, 2018, 11:30 | #3 |
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Update 2.
Turns out that you need all three bulbs fitted for the circuitry to actually work, the system must be wired in series or something, all working, not particularly bright though so hunting for plug and play LED items, still no luck with the headlight panel though, I may well just fit LEDs here and then spur off some wiring back there to give me my ignition live.
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Sep 23rd, 2018, 19:57 | #4 | |
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