matt_gsxr
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| posted on 17/7/13 at 09:11 AM |
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Audi A6 brake light fog light interaction
Hey there,
Just got my 2005 Audi A6 MOTed. It got through fine but with a question mark over the brake light operation.
So,
There are 5 areas that light up under normal operation.
1 in the rear screen
1 on the inner right
1 on the outer right
1 on the inner left
1 on the outer left.
These all operate fine when the fog-light is off.
With the rear fog-lights on
Only the rear screen and the 2 inner brake lights operate.
It is all symmetrical so I doubt it is earthing related, which was my first guess.
They gave it a pass because the brake lights worked, but they weren't happy.
Anyone got any experience of this. It is a very early version of this car (54 plate). It has been through loads of MOT's previously with no
mention. I haven't messed around with it (as far as I remember).
I don't think I have ever used the rear fog-light, so it is a bit academic, but its in my head now!
Matt
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Slimy38
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| posted on 17/7/13 at 09:21 AM |
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Actually, I think you were right the first time. In some cases, the 'centre' lights (IE the rear screen and the inner lights) come off one
earth, and the outer lights come off another. It's usually related to the wiring diagram for a hatchback, IE the ones attached to the tailgate
are all in one circuit, and the ones attached to the car are a second circuit.
It sounds like the fog light (that I'm guessing is in the 'outer' cluster?) is causing an earth short.
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matt_gsxr
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| posted on 17/7/13 at 09:26 AM |
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fog light is in the outer cluster.
Electrics on this car are mega complicated.
I was really hoping someone was going to say that this is what its supposed to do!
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AndyW
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| posted on 17/7/13 at 10:44 AM |
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quote:
Originally posted by matt_gsxr
fog light is in the outer cluster.
Electrics on this car are mega complicated.
I was really hoping someone was going to say that this is what its supposed to do!
That's what I was going to suggest, if the fog light is in the outer cluster, it would make sense that when the fog lights are on, that the
brake light on the inner cluster work only, this would stop the outer brake light becoming masked by the fog light. These cars are immensely
complicated and do things that we are not aware of!!!
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matt_gsxr
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| posted on 17/7/13 at 03:27 PM |
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I'll post something on the vwaudiforum to see if it is normal behaviour (I hope it is, but I am not optimistic)
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FuryLee
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 posted on 19/7/13 at 06:32 PM |
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Audi A6 Rear lights
Hi Adrian has asked me to comment on the opporation of A6 rear lights. Ca'nt think why he asked me!
The lights are opporating exactly as they should, just as any kit going through IVA have to have a specific gap between the fog and stop lights, all
european manufactures have to abide by the same rule.As has allready been sugested, Its purpose is to clearly show when the stop lights have been
applied in all conditions.
Lee audi master tech
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britishtrident
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| posted on 19/7/13 at 06:45 PM |
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All getting too clever by half.
Today I rectified an engine warning light on a Nissan Note the cause was a defective reverse light switch --- for anybody with a Nissan who
might be interested the fault code was P1706.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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matt_gsxr
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| posted on 19/7/13 at 09:17 PM |
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quote:
Originally posted by FuryLee
Hi Adrian has asked me to comment on the opporation of A6 rear lights. Ca'nt think why he asked me!
The lights are opporating exactly as they should, just as any kit going through IVA have to have a specific gap between the fog and stop lights, all
european manufactures have to abide by the same rule.As has allready been sugested, Its purpose is to clearly show when the stop lights have been
applied in all conditions.
Lee audi master tech
Thanks Lee.
Thanks for clearing this up.
I'll print this out for the next MOT (or probably just take it somewhere else).
Thanks again,
matt
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