Lights will not turn off

[a4cvt]

2004 a4 b6 1.9 tdi cvt.

I was driving and noticed that my lights were on. I turned the rotary light switch to the ON position and the lights seemed to switch to the fog lights properly. When I turn off the engine the lights go off. The off position on the light switch leaves the lights on and I cannot turn them off.I have changed the switch and still have the same problem. Any ideas experts.

[mikeybutch]

If its not the switch I think you will need diagnostics to check whats happening

[a4cvt]

Thank you for the reply. I have looked up the electrical system in the Haynes manual. They list a relay in the circuit as 17 'X' contact relay. Do you know where this relay is mounted so I can check it before I start looking at the power supply control unit.

[Rob69]

Run web searches for central electronic control module.

[a4cvt]

If it was the switch that was faulty, now I have changed the switch would a fault code still be in the system?. If so how do I clear it.

[kite]

Was the new switch the same part number ?
There are different revisions of switches.

[a4cvt]

The switch was identical. The part numbers matched each other. Does anyone know where the switch relay and power control module is located please.

[a4cvt]

Update on lighting situation. Looks like the vehicle electrical system control module has become faulty. I have been quoted £251.00 +vat by the local VW indy to supply the unit. Is it necessary to program this module once it is installed?. Part number is 8E0907 279F

[a4cvt]

Update on lighting situation. I bought a second hand module and fitted it today. Happy to report all lights now function correctly.