A4 B7 dip beams come on with ignition only.

**liam walsh** · 21-10-2024,05:25 PM

Hi All,

I've an A4 B7 2008 and dip beams , park lights and number plate lights come on with ignition only , the rotary light switch does not turn on or off the lights. The lights on the switch bezel come on as selected. The car does not have auto lights.
Main beams can only be activated by pulling back the dip/main beam stalk..
I got a known good OEM used replacement light switch but it did not fix the problem.
If I disconnect the light switch from the car the lights go off.
VCDS says implausible signal from E1 switch ( rotary switch for the lights)
If I pull fuse 14 ( steering control unit) the lights go off.
Internet searches show similar issues on other B6/B7s but I couldn't find any useful solutions.
Anyone got any experience of my issue or a next logical step for trouble shooting this

TIA.

**Crasher** · 22-10-2024,03:34 PM

The dipped beams should only come on with the ignition on but the sides/number plate lights should come on ignition off but you should be able to turn them off, obviously UNLESS someone has been playing with the BCM soft coding. History and full VCDS scan (with VIN)?

**liam walsh** · 22-10-2024,04:55 PM

Hi vin is wauzzz8E8A140944. Only 1 fault code on vcds 1 Faults Found
01800 -Light Switch (E1)
27-00 implausible signal.

I had a similar but intermittent problem about a year ago and replaced the switch E1 with a VEMO switch and I thought fixed the problem but the issue still appeared very intermittently and very infrequently . Then it stopped working completely and I replaced with an OEM but used switch. Nil fix. I could buy another VEMO switch just to see.

**Crasher** · 22-10-2024,05:02 PM

Vemo parts have always been good in my experience, but that VIN doesn't work.

**liam walsh** · 22-10-2024,05:11 PM

Wauzzz 8E 2 8A140944 sorry I missed little 2 didn't think it was important.

**Crasher** · 22-10-2024,05:37 PM

OE switch 8E0 941 531 C 5PR (5PR just means black) which is £164.40 genuine and a Vemo V10-73-0266

**liam walsh** · 22-10-2024,05:51 PM

Thanks for looking to that for me .
The new to me used OEM switch I have is p/n 8E0 941 531 A 5PR would the A make a difference? I was thinking A and C were just revisions but essentially the same parts?

**Crasher** · 24-10-2024,06:08 AM

8E0 941 531 A 5PR (obsolete genuine) is for cars 08/04>01/05, 8E0 941 531 C 5PR is for cars 01/05 to 06/08 and yours is 04/02/2008.

**liam walsh** · 24-10-2024,07:13 AM

Crasher thank you very much for taking the time . . You've been very helpful. . Metzger switch ordered as stock of the right VEMO switch seems to be non existent in Ireland at present.. hopefully that fixes my issue. I'll report back in any case.