AH FabricationsSky Insurance
Results 1 to 17 of 17
  1. #1
    S4 Cabriolet 04

    Status
    Offline
    Join Date
    Jul 2009
    Location
    Bradford, England
    Posts
    26

    Head lights always on and Auto Dim Mirror not working???

    my healdights stay on whether i have them on auto or 0, the dimming mirror does not switch on too, i guess they are linked somehow. it seems to be a fault others have experienced but there are no answers on how to solve it?

    any one experienced this problem? its fault code 01800 - Light Switch (E1) i have read on audizine you can code the headlights for a region code ?? will that make a difference, anyone coded their headlights?

    i was just going to buy a new switch but on audizine people who experinced this fault said a new switch did not solve the problem?

    my car is audi s4 cab 2004

    any help would be appreciated.

  2. # ADS
    ADS
    Join Date
    Always
    Location
    Global
    Posts
    Many
     
  3. #2
    "Stick a V8 in it!"

    Status
    Offline
    Join Date
    Jan 2008
    Location
    Glenrothes, Fife, Scotland
    Posts
    14,900
    http://www.audizine.com/forum/showthread.php?p=4210776

    Google finds that.

    Sounds like a faulty light switch.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  4. #3
    S4 Cabriolet 04

    Status
    Offline
    Join Date
    Jul 2009
    Location
    Bradford, England
    Posts
    26
    i guess i will have to try the switch, thanks for the link

  5. #4
    S4 Cabriolet 04

    Status
    Offline
    Join Date
    Jul 2009
    Location
    Bradford, England
    Posts
    26
    just an update really, got a new switch from audi and guess what?? same problem headlights stay on, what the hell can it be ?? i am thinking of disconnecting the auto dimming mirror if that is possible , i would appreciate if someone can tell me how to do this? or any other ideas i could try.

  6. #5
    Reverse Gear

    Status
    Offline
    Join Date
    Dec 2009
    Posts
    3
    Hi,
    My car has the same problem too. My battery drained out because of cold weather and this problem started. Then I replaced the battery and cleared the codes. But I still have the lights ON on Auto and O and also the dimming mirror has no power.

    Were you able to figure out the solution. Any help is greatly appreciated.

  7. #6
    Woorlord's Avatar
    shifting to Hyperspace... .

    Status
    Offline
    Join Date
    Dec 2007
    Location
    Tiptree, Essex
    Posts
    946
    From Ross-Tech web site:

    01800 - Light Switch (E1): Implausible Signal

    Possible Symptoms


    • Parking Light Status Lamp (in Instrument Cluster) stuck ON
    • Self Dimming Rear View Mirror not working
    Possible Causes


    • Light Switch (E1) faulty (or switched to an intermediate position)
    • Wiring/Connectors from/to Light Switch (E1) faulty
    Possible Solutions


    • Check Light Switch (E1)
      • See Measuring Value Blocks (MVB)
    • Check Wiring/Connectors from/to Light Switch (E1)
    Special Notes


    • When found in Audi A3/S3 (8P): Central Electronics, check Light Switch Status in Measuring Value Block (MVB) 017 and 018.
    • When found in Audi A4/S4/RS4/Cabriolet (8E/8H): Central Electronics, check Light Switch Status in Measuring Value Block (MVB) 006.1.

    Looks like it could be a duff Mirror if the light switch has been changed??
    2001 A4 Saloon 3.0 Quattro Sport Tiptronic - Platinum Leather/Heated Front Seats/BOSE/DIS/Cruise Control
    Retrofits:GmBH Bumpers, F&R Ambient LEDS, OEM Valeo Xenons (D2S) & Headlight Washers, Auto-dipping RVM, Footwell Lights, Vent Control illumination, ISO-Fix, RNS-E & OEM Bluetooth + VIMhack + Video i-pod & Aux inputs, Rear PDC, Powerflow 100mm Tips, Reversing Camera
    2012 A4 Saloon 2.0 TDIe Technik (163ps)
    Diagnostics:VCDS HEX+USB+CAN Cable

  8. #7
    Reverse Gear

    Status
    Offline
    Join Date
    Dec 2009
    Posts
    3
    Thanks for the reply. I will check these things right away.

    I have a question though. The rear view mirror has the light sensor whose signal is used by the Auto light switch to switch on or off the lights. But the rear view mirror has got no power and so the sensor is off. I am suspecting the wiring to the mirror has gone wrong.

    I read somewhere that we need to use the correct code settings for the headlight & mirror to work accurately. Do you by any chance have the code?

  9. #8
    Woorlord's Avatar
    shifting to Hyperspace... .

    Status
    Offline
    Join Date
    Dec 2007
    Location
    Tiptree, Essex
    Posts
    946
    CODING: See Ross Tech A4/B6 under Module 09 Central Electronics
    Here you have to specify if you have a light sensor.
    2001 A4 Saloon 3.0 Quattro Sport Tiptronic - Platinum Leather/Heated Front Seats/BOSE/DIS/Cruise Control
    Retrofits:GmBH Bumpers, F&R Ambient LEDS, OEM Valeo Xenons (D2S) & Headlight Washers, Auto-dipping RVM, Footwell Lights, Vent Control illumination, ISO-Fix, RNS-E & OEM Bluetooth + VIMhack + Video i-pod & Aux inputs, Rear PDC, Powerflow 100mm Tips, Reversing Camera
    2012 A4 Saloon 2.0 TDIe Technik (163ps)
    Diagnostics:VCDS HEX+USB+CAN Cable

  10. #9
    Cockney Boy's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Nov 2007
    Location
    Aylesbury, Buckinghamshire, UK
    Posts
    485
    You may have a faulty rain/light sensor (infront of your mirror) this should be changed when you have a new windscreen, bu they are known to fail on their own
    Q7 S Line 2010
    MMI 3G
    Adaptive Cruise Control
    Superchip Remap
    Blackvue front and rear accident camera

  11. #10
    Reverse Gear

    Status
    Offline
    Join Date
    Dec 2009
    Posts
    3
    Thanks for the inputs. My problem has been fixed. I am including the details for anyone who might have the same issue. I recoded the settings in the electrical module specifying that there is a light sensor and it solved the problem. In the 5 digit code, the 4th digit should be 1 (X1XXX)

  12. #11
    Reverse Gear

    Status
    Offline
    Join Date
    Apr 2010
    Posts
    1

    Smile Hi, can you tell me how you fixed the problem with the auto dim mirror?

    Hello,

    I have a 2005 audi a4 convertible and my interior mirror with auto dim and compass stopped working after changing the battery. I've replaced the headlight switch, tried a new interior mirror, still nothing... Can you tell me how you've fixed that issue?
    Thanks

    A newbie!!!


    Quote Originally Posted by zyxwv View Post
    Thanks for the inputs. My problem has been fixed. I am including the details for anyone who might have the same issue. I recoded the settings in the electrical module specifying that there is a light sensor and it solved the problem. In the 5 digit code, the 4th digit should be 1 (X1XXX)

  13. #12
    Reverse Gear

    Status
    Offline
    Join Date
    Aug 2010
    Posts
    2
    I have and Audi A3 8P MY2004, but my auto-dimming mirror doesn't dimm but it has the green lkight active.

    Can someone tell me what can I do to fix this ?

  14. #13
    Reverse Gear

    Status
    Offline
    Join Date
    Dec 2006
    Posts
    23
    likewisw, have the same prob on my2005 Audi A3

  15. #14
    NHN
    NHN's Avatar
    Modmetractor

    Status
    Offline
    Join Date
    Jan 2008
    Location
    Coding Something
    Posts
    26,721
    Wrong section mate & you will need vcds to diagnose this tbh as that will show you what connections are not making contact.

    OEM RETROFITS - CRUISE CONTROL - SAT NAV - BLUETOOTH - AMI - HEADLIGHT SYSTEMS

    PARKING SYSTEMS - DIAGNOSTICS - FAULT FINDING - BODYWORK - PAINTWORK

  16. #15
    bez101's Avatar
    Yorkshire & Humber Rep.

    Status
    Offline
    Join Date
    Jul 2008
    Posts
    7,931
    mine was light sensor

  17. #16
    Reverse Gear

    Status
    Offline
    Join Date
    Dec 2006
    Posts
    23
    Many thanks, I''ve pmd you for the vcds cable....

  18. #17
    Reverse Gear

    Status
    Offline
    Join Date
    Feb 2012
    Posts
    1
    I've had the same problem on my 2004 A4. Headlights always on and the mirror doesn't dim or show the direction anymore. This happened after I was working on the car and let the battery go dead. I did have one headlight unplugged when the battery died (not sure if that matters).

    If I buy a vag-com cable off of Ebay, will I be able to recode whatever it is I need to recode?

 

 

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO

Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

Content Relevant URLs by vBSEO