8P Wing Mirror Indicator/Repeater Strange Issue - Grounding?

swedeee

Registered User
Hi guys - first post. Use the search to no avail so thought it was best to ask in here

I bought a 2012 Audi A3 1.6 Technik in early April. It's been great so far, even for a base model (had use of an 09 1.8T A3 previously). However, a few weeks ago I started having a really odd issue with both wing mirror indicators;
  • Either one of them will stop working completely, or at best flicker on slightly (never both dying at the same time!)
  • This alternates between mirrors every few days, but the right one seems more afflicted
  • Rear and front indicators have no problems at all
  • When a single mirror indicator works, the speed and brightness of the indicator is completely normal
  • No other electrical problems with the car at all (to my knowledge)
  • No warning lights
Troubleshooting;
  • The fact that this has happened to both mirrors at the same time, and the fact that they do work completely normally every now and again, makes me thing that wiring to the mirrors and the bulbs themselves are fine
  • The front and rear indicators are fine and work perfectly when indicating and using hazards - making me think there is no problem with the relay
  • Lack of other electrical faults makes me think the battery is absolutely fine
  • The intermittent flickering of the mirror indicators when on makes me think it could be a grounding issue...
Any other suggestions? I am quite handy so keen to try sorting it myself before handing it to garage (it will not pass an MOT if the problem persists)

cheers
 

NHN

Retrofitter - Audi - VW - Skoda - Seat
Site Sponsor
VCDS Map User
Check door hinge wiring for breaks, ideally try a new indicator if no obvious wiring issues.
 

swedeee

Registered User
I have checked the door hinges - all seems normal.

I also find it hard to believe that it is a mirror wiring issue.. after 6 years since manufacturing, both miror indicators start playing up within a few days of each other? Very odd. Appreciate the input though!
 

NHN

Retrofitter - Audi - VW - Skoda - Seat
Site Sponsor
VCDS Map User
Basics 1st bud, then get down & dirty.
 

ch1z64

C'mon you's bhoy's in Green
VCDS Map User
Silver Supporter
Maybe a scan will throw up error codes maybe a short to ground . Best to find out
 

swedeee

Registered User
Yep I have been swatting up on my electronics, it could definitely be a short to ground somewhere causing an issue. Just locating it is going to be a pain

I am going to clean all the ground points to begin with, followed by checking the current flow to the wing mirror. I can't find a ground point diagram for the audi a3 8p or a mirror wiring diagram either. Would anyone be able to point me in the right direction?
 

ch1z64

C'mon you's bhoy's in Green
VCDS Map User
Silver Supporter
Yep I have been swatting up on my electronics, it could definitely be a short to ground somewhere causing an issue. Just locating it is going to be a pain

I am going to clean all the ground points to begin with, followed by checking the current flow to the wing mirror. I can't find a ground point diagram for the audi a3 8p or a mirror wiring diagram either. Would anyone be able to point me in the right direction?
There is a web site you can use for around £30 for 24hrs which gives you printing rights but you will need a hell off a lot of paper ( https://erwin.audi.com ) there u will find all the info you need about your car.
 
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