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D3 - Lights Headlights, xenons, foglights. Everything outside the car that glows |
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Thread Tools | Display Modes |
#1
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D3 Rear indicator LEDs keep blowing
Back in June my left side rear indicator stopped working, too many LEDs had blown. I replaced them all and it worked fine for about 3 weeks, then they were blown again. I thought maybe I had bad batch of LEDs or something and replaced them again, but now they've stopped working again...
So I wonder if the "control PCB" is broken and is now frying the LEDs? Has anyone had similar problem? I replaced the rear light LEDs about a year ago and have had no problems whatsoever.
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Audi A8 D3 2006 - 4.2 TDI in Phantom Black |
#2
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When you say replaced them, do you mean opened it up and fixed it or just replaced the whole light unit?
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Currently '8-less Previously: - Aqua Blue Pearl D3 S8 - Kamut Beige leather, ACC, B&O, factory RSE, solar sunroof, electric blinds, ski bag, Homelink, comfort headrests. - Aqua Blue D2 S8 - Grey leather/Alcantara - D3 A8 3.0 CVT - D3 3.7 V8 |
#3
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I opened it and soldered new LEDs.
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Audi A8 D3 2006 - 4.2 TDI in Phantom Black |
#4
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Check the current limiting resistors on the circuit, I still have the pcbs from my old lights, the passenger side was on its way out with blown leds and the drivers side was fine IIRC.
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Del |
#5
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Thanks Del, any advice how to check them? i.e. can I measure them on the board or do I need to remove them? From memory there are about half a dozen connected in parallel.
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Audi A8 D3 2006 - 4.2 TDI in Phantom Black |
#6
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You should be able to measure the resistance through them by connecting the multimeter on either side set to ohms hopefully they will Al be the same resistance.
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Del |
#7
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Finally managed to remove the lights again. There are 5 resistors connected in parallel, so they can't be measured individually on board. However, I removed both sides and both measure 1.6ohm with my multimeter. Colour code is Blue-Gray-black-silver-brown, which means 6.8ohm, i.e. 5 in parallel should be 6.8ohm/5 = 1.36ohm. Close enough I guess and as both sides return the same result, I believe the resistors are fine.
Del, did you say you have old PCBs, do you have the main PCB too? Would you be willing to sell them? Thanks
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Audi A8 D3 2006 - 4.2 TDI in Phantom Black |
#8
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I believe I do, will need to have a root around in the shed, I'll let you know
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Del |
#9
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Thanks Del, much appreciated.
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Audi A8 D3 2006 - 4.2 TDI in Phantom Black |
#10
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I had a quick look
All i could find was one pcb, the shed is like a tip at the moment though.
If your badly needing them I could turn the shed out tomorrow.
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Del |
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