Audi A4 B6 headlight switch

corcaigh1

Hi all,

Replaced my headlight switch cover from ebay as below for a B6 Audi A4 and on refitting the switch the park lights now wont turn off when I remove the key from the ignition and the low beam stays on when the ignition is on, cycling the headlight switch does nothing.

I have to disconnect the headlight switch from the wiring loom to disable the park lights...

I thought I might of messed up the headlight switch so got another one and I still have the same issue. VCDS is not reporting any fault codes..baffled??




http://www.ebay.co.uk/itm/New-AUDI-A4-8E-B6-B7-00-07-HEADLIGHT-LIGHT-SWITCH-COVER-8E0941531-/261985556346?hash=item3cff8e577a:g:aQQAAOSwjVVVuejo

corcaigh1

Anybody??

jca

Not a clue tbh. Does everything work with the old switch? Maybe its a switch for auto lights or vice versa...

corcaigh1

jca wrote: »

Not a clue tbh. Does everything work with the old switch? Maybe its a switch for auto lights or vice versa...

Thanks "jca"

The old switch is not working now or the replacement switch and both switches are non auto. Very strange :mad:

zizou_

corcaigh1 wrote: »

Thanks "jca"

The old switch is not working now or the replacement switch and both switches are non auto. Very strange :mad:

Stating the obvious but have you checked the codes in the eBay ad against your old switch? I remember replacing the light switch on my B6 years ago and when I plugged in the new one it did all sorts of weird things like you described. I ended up going back to the old one.

irish bloke

I replaced the covers on my switch sometime back and it was a bi#@h to remove the selector knob if I remember correctly. Dremel came out in the end.

Just so I have it right:

• Original switch with worn covers: Working
• Original switch with new covers: Not working
• New switch with new covers: Not working

If scenarios above are correct, it sounds like something on the wiring harness plug or wiring got damaged during installation or is connected incorrectly. Would start here..

corcaigh1

zizou_ wrote: »

Stating the obvious but have you checked the codes in the eBay ad against your old switch? I remember replacing the light switch on my B6 years ago and when I plugged in the new one it did all sorts of weird things like you described. I ended up going back to the old one.

Yes the switch is the correct code...

irish bloke wrote: »

I replaced the covers on my switch sometime back and it was a bi#@h to remove the selector knob if I remember correctly. Dremel came out in the end.

Just so I have it right:

• Original switch with worn covers: Working
• Original switch with new covers: Not working
• New switch with new covers: Not working

If scenarios above are correct, it sounds like something on the wiring harness plug or wiring got damaged during installation or is connected incorrectly. Would start here..

Yup above is correct, I have examined the loom for damage but it seems ok...

irish bloke

get yourself a pin-out diagram for the switch plug and test it..

corcaigh1

irish bloke wrote: »

get yourself a pin-out diagram for the switch plug and test it..

Thanks "irish bloke"

I believe this is the pin out diagram for the switch, how do I test it?

http://i240.photobucket.com/albums/ff183/theamazingdave/Passat%20Repair/Switchdiag.jpg

irish bloke

You will need a wiring diagram too. This is just off the net for a 2002 A4 (Bentley manuals)

Check for power and ground first at multi-pin plug:

• Check for headlight 12V power at connector pin 15/30. According to diagram this switches to terminal 11/56 (yellow wire) which feeds the headlight adjuster switch. According to your pinout (which may not be correct) its pin 4/56.
• Check for Ignition 12V power at connector pin 1/XZ (black wire) - Make sure ignition is switched on
• Check for fog light front and rear 12V power at connector pin 2/XR (black/yellow wire). - May need ignition switched on
• Check for instrument panel 12V power at connector pin 17/58d (grey/blue wire) - May need ignition switched on
• Check for ground 0V at connector pin 10/31 (brown wire).


You could then apply power directly to rest of lights via there supply to test them or else complete a resistance check on the wires for breaks. – these all appear to go through electrical system control module J519

Example would be applying 12V power from terminal 2/XR (black/yellow wire) to front fog lights (terminal 8/NL, white/green wire) or to rear fog lights (terminal 9/NSL, white/grey wire). Again the ignition may need to be turned on.

Hope this helps

corcaigh1

Your a gent "irish bloke" appreciate it. Will have a look tomorrow!

corcaigh1

Update: Tried few tests you suggested "irish bloke" and all was fine so I was baffled.

I decided to head to a breakers and try another few switches available and it turns out the original switch I had 8E0941531 was faulty (prob messed it up changing the faceplate on it) and the replacement I got 8E0941531A was an incorrect switch so another 8E0941531 switch solved the problem. Thanks for the input lads...