With headlight switch set to auto my lights are coming on sometimes in bright daylight/sunshine, but when it dulls down they switch off, doesn't always do it, it's been in the garage and they can't find a fault, anyone experienced this or have any ideas of the cause.(it's not a dirty sensor as it does it when the cars just been cleaned as well)

faulty sensor? ============
2010 TDV8 HSE - ooo laa laaaaaaaaa
2007 TDV8 HSE - superb car and very reliable
============
2012 - dearly departed, sadly missed.. to return in late 2013 with a new TDV8!

Mine does the same, they come on at times I'd not expect, but it's been the same on all cars I've had, be they BMW, Audi or the RRS.
I think the sensors get fooled by bright sun and overcast weather sometimes.  ON THE WAY: BMW F21 M140i
MERCEDES GL350 - Metallic Navy Blue w/Grey interior

GOING: BMW F31 335D MSport+ xDrive Touring
GONE: Land Rover Discovery 4 HSE - Stornaway Grey w/Black Interior (wish we'd kept it )
GONE: BMW F10 520D MSport - Carbon Black
GONE:MY12 RRS SDV6 HSE Sumatra/Ivory/Grand Black Privacy glass

Beancounter_74 wrote:

Mine does the same, they come on at times I'd not expect, but it's been the same on all cars I've had, be they BMW, Audi or the RRS.
I think the sensors get fooled by bright sun and overcast weather sometimes.

It's actually intentional. Most manufacturers set auto lights to come on when you are traveling away from bright light (I.e the sun is directly behind you) as it means that the drivers driving towards you (into the sun) can see you. I have no idea how this is achieved as the light sensor is at the top/middle of the screen as far as I'm aware?

James

IIRR Bobby posted something explaining this issue before. The system also takes the angle of the sun (ie low in Winter) to decide when to operate. Now - MY11 RRS Autobiography TDV6, Orkney gray, tints, steps, daylight running lamps and allllll the toys!!!
Ex- RRS HSE TDV6 07 Java Black, bi xenon, corner lights, side steps, tints, cool box, smoke side repeats, chrome "sport" boot sill
Ex - Audi A4 Cab 3.0TDi Quattro
Ex - Freelander2 SE TD4
Ex - CRV Auto

maybe connected to the auto dim rear view mirror sensor james?

all my discos have and the rrs does the same Range Rover Sport HSE TDV8 MY2010
Discovery 3 HSE 2007
Discovery 2 TD5 (gone)
Discovery 300 tdi
Range Rover Bobtail (gone)
90 hybrid (gone)

Could well be connected to the mirror but I also seem to remember its main sensor is that plastic dome thing at the front of the dash Now - MY11 RRS Autobiography TDV6, Orkney gray, tints, steps, daylight running lamps and allllll the toys!!!
Ex- RRS HSE TDV6 07 Java Black, bi xenon, corner lights, side steps, tints, cool box, smoke side repeats, chrome "sport" boot sill
Ex - Audi A4 Cab 3.0TDi Quattro
Ex - Freelander2 SE TD4
Ex - CRV Auto

Mine does the same the 1st time it did it i was surprised to see my lights shining on the car infront whilst sat at some traffic lights when the sun was shining, but i didn't worry about it and have noticed it since, but thanks for the explanation james,

Last edited by Ady 555 on Sun Jan 22 2012 7:43pm. Edited 1 time in total

James @ Lookers Park Royal wrote:

Beancounter_74 wrote:

Mine does the same, they come on at times I'd not expect, but it's been the same on all cars I've had, be they BMW, Audi or the RRS.
I think the sensors get fooled by bright sun and overcast weather sometimes.

It's actually intentional. Most manufacturers set auto lights to come on when you are traveling away from bright light (I.e the sun is directly behind you) as it means that the drivers driving towards you (into the sun) can see you. I have no idea how this is achieved as the light sensor is at the top/middle of the screen as far as I'm aware?

James

hmmm James is this like your explanation for why the rear interior lights don't come on when the door is opened  ============
2010 TDV8 HSE - ooo laa laaaaaaaaa
2007 TDV8 HSE - superb car and very reliable
============
2012 - dearly departed, sadly missed.. to return in late 2013 with a new TDV8!

RRSBoy - Er no.... One set of lights are designed to come on and the other are designed not to come on.....

James

James @ Lookers Park Royal wrote:

It's actually intentional. Most manufacturers set auto lights to come on when you are traveling away from bright light (I.e the sun is directly behind you) as it means that the drivers driving towards you (into the sun) can see you. I have no idea how this is achieved as the light sensor is at the top/middle of the screen as far as I'm aware?James

Seems logical to me James, thanks for the reasoning
I'll be honest though, it's not one of those things that bothers me.  ON THE WAY: BMW F21 M140i
MERCEDES GL350 - Metallic Navy Blue w/Grey interior

GOING: BMW F31 335D MSport+ xDrive Touring
GONE: Land Rover Discovery 4 HSE - Stornaway Grey w/Black Interior (wish we'd kept it )
GONE: BMW F10 520D MSport - Carbon Black
GONE:MY12 RRS SDV6 HSE Sumatra/Ivory/Grand Black Privacy glass

Steuart64 wrote:

The system also takes the angle of the sun (ie low in Winter) to decide when to operate.

God Damn we drive one extremely sophisticated car

Things like that should be marketed better! Vadim A.