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| D2 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc |
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#1
7th July 2021, 11:19 AM
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Internal mirror wiring for dimming mirror
A while back now I bought an auto-dimming internal mirror but due to various reason I am yet to try and fit it!
I am hoping that I can splice into the mirror loom rather than using the wiring in the car, that way if I or someone else ever wanted to change back it will be simple. As I have a facelift car with the ambient lighting I was thinking tapping into that would make the most sense as it would then activate with the headlights, what I haven't been able to find is which wires this would be. Does anyone know which these would be? I came across the picture below from Goran when fitting his dashcam which shows the reading lights circuit. in this post http://forum.a8parts.co.uk/showthread.php?t=11184 This leaves the Green/Cream, Grey and Blue wires to check.
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Cars... '93 Audi Coupe 2.0 Alpine White (sold) '99 Audi S4 Merlin Purple - K04 upgrade to 412hp (sold) '00 Audi S8 Agate Grey (Sold  )'11 Audi Q7 4.2tdi Unknown Red (Classic Red Pearl Effect - thanks MJ) 
Last edited by pete-p; 8th July 2021 at 07:19 AM. Reason: Link to post 
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#2
7th July 2021, 11:41 AM
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Racking my brains a bit on this, I fitted one to my PF S8 which has rather less wiring up there!
The best place I found to wire in was the sunroof circuit, easy to identify from the switches on PF. That circuit (checked by testing with a multimeter and I'd guess FL is the same) is live with ignition on and goes off after a small delay when ignition is turned off. It obviously doesn't matter if it's "active" when the headlights are not. 
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.). 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one!  Finally: gone, but not forgotten..... 1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! 
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#3
7th July 2021, 03:22 PM
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This is the thread that I referred to when I fitted mine:
http://forum.a8parts.co.uk/showthread.php?t=1100
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts Sold! 2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II HeadlightsMy DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds
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#4
7th July 2021, 07:27 PM
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Thanks for the replies. I think I've read almost all there is about the wiring there but was really hoping I could use the feed for the ambient lighting and connect it all in the one harness before fitting it in.
I may dig out my multimeter and see what the blue and grey wires do, perhaps that's where I need to look first. I saw mention of blue with red stripe being illumination so there could be a link there with the plain blue in the mirror harness... probably too simple though!
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Cars... '93 Audi Coupe 2.0 Alpine White (sold) '99 Audi S4 Merlin Purple - K04 upgrade to 412hp (sold) '00 Audi S8 Agate Grey (Sold )'11 Audi Q7 4.2tdi Unknown Red (Classic Red Pearl Effect - thanks MJ)
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#5
7th July 2021, 08:41 PM
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Didn't we have a thread on this recently where we decided it's possible to do it with four of the six wires on the mirror, just using things that are in there already? If I recall correctly, the only things which aren't there are the reverse signal (to disable the dimming) and the output to the door mirrors (which aren't there anyway).
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#6
7th July 2021, 09:18 PM
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That might have been me in the sale thread
http://forum.a8parts.co.uk/showthread.php?t=15718 I'm sure it's possible, just need to identify which of the three remaining wires to use.
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Cars... '93 Audi Coupe 2.0 Alpine White (sold) '99 Audi S4 Merlin Purple - K04 upgrade to 412hp (sold) '00 Audi S8 Agate Grey (Sold )'11 Audi Q7 4.2tdi Unknown Red (Classic Red Pearl Effect - thanks MJ)
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Hybrid Mode
