Have you set the coding in VAGCOM to use "personalisation or light sensor" (adaptation or potentiometer in older versions of VAGCOM).
With personalisation it will always be on, with light sensor it will only work if for leaving home if the light switch is set to auto (and the button is pressed). The coming home is always active regardless of the position of the light switch. (That may be the reverse - LH always active and CH dependent on auto)
Yep, tried it with both ways. When I set the coding as "with light sensor" everything works as it should do for 1 attempt. i.e. I can switch the auto lights on in the daytime and they don't come on but when I turn them off and back on again, they come on! After the second attempt, the following errors are also logged-
Address 09: Cent. Elect. Labels: 8P0-907-279-23-H.lbl
Part No SW: 8P0 907 279 F HW: 8P0 907 279 F
Component: Bordnetz-SG H43 1201
Revision: 00H43000 Serial number: 00000007079325
Coding: F58E5F07A014100000000000000000000008EE175A0500
Shop #: WSC 06314 000 08192
Part No: 8P2 955 119 E
Component: Wischer AU350 H01 0130
Coding: 00062736
Shop #: WSC 06314
Part No: 4E0 910 557 B
Component: REGENLICHTSENSORH13 0100
Coding: 00141886
Shop #: WSC 06314
2 Faults Found:
02071 - Local Databus
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 2
Fault Frequency: 2
Reset counter: 151
Mileage: 17124 km
Time Indication: 0
Date: 2008.07.14
Time: 19:57:00
Freeze Frame:
OFF
Voltage: 12.10 V
OFF
ON
OFF
OFF
OFF
01520 - Rain and Light Recognition Sensor (G397)
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 2
Fault Frequency: 2
Reset counter: 151
Mileage: 17124 km
Time Indication: 0
Date: 2008.07.14
Time: 19:57:00
Freeze Frame:
OFF
Voltage: 12.10 V
OFF
ON
OFF
OFF
OFF
The same happens with the CH/LH function. After clearing the DTC'S, it works as it should do for 1 attempt them stops working and produces the same DTC's.
I pretty sure its something to do with the wiring, so I need to check it thoroughly first, then it may be down to the light sensor (which I hope not as it's new from VAG parts).
If I use the "personalisation" setting, the Auto lights (in the auto setting)just come on regardless and the CH/LH function also works regardless whether it's day or night.
In addition, with the light/rain sensor installed and Vagcom set to "light sensor", the auto wipers work fine!!
Wow, if you understand that lot you should be Nuclear Scientist or something!!
Some answers that would be helpfull, if someone wouldn't mind, to help clear up some theories are:
1. What sensor does the auto lights and CH/LH use to determine whether it's daylight or not? There are 2 sensors on the rear view mirror and there is a main sensor attached to the back of the windscreen behind the rear view mirror. (this also serves the auto wipers) If someone could just cover each of the sensors in daylight, with the auto lights switched on, just to see whether it tricks the lights into thinking it's dark and turns them on, so as to confirm which sensor it is.
2. Confirm that the CH/LH lights only work when its dark regardless of whether they are turned on or not.
Thanks guys and sorry about the essay!