Hello All,

Have left the light switch in position 4 for 4 years and now it does not sense low ambient light to switch on the lights.In fact it does not switch sidelights or mains on.

The lights work fine on position 2 or 3.

Only thing done to the car was new battery at the dealer last week

Any body any ideas how to fix?

Where is the light sensor situated on a 2005 RR anyway ?

ken0204 wrote:

Hello All,

Have left the light switch in position 4 for 4 years and now it does not sense low ambient light to switch on the lights.In fact it does not switch sidelights or mains on.

The lights work fine on position 2 or 3.

Only thing done to the car was new battery at the dealer last week

Any body any ideas how to fix?

Where is the light sensor situated on a 2005 RR anyway ?

Have you spoken to the dealer about it? If you took it in there for a battery I presume you are well aquainted with them?

The sensor is in with the rain sensor - in front of the rear view mirror. This is then fed to the Light Control Module, if it detects a fault it will give you basic lighting.

You'd do well to get a copy of the workshop manual - if you are technically minded this can save you $$ instead of visiting the dealer. 

i would say its te rain sensor and at around 40 pounds would be the cheaper option but as dan said you would do well in getting a manual, its a very quick test with the sensor remove the cover around the mirror and unplug the the connector you dont even have to take it off the mount, connect it to the new sensor and cover the front, if the lights work you have found your fault but if not then put it back in the box and return it.you could do this in the car park of the dealer should only take 15 min max... V8 facelift Range Rover Autobiography 22" wheels.
1976 Harley Davidson Iron Head Sportster

ken where about are you in essex... V8 facelift Range Rover Autobiography 22" wheels.
1976 Harley Davidson Iron Head Sportster

Thanks Dave and Dan,

Tried a new sensor as suggested and bingo-all sorted!

Brilliant advice and the pleasure of not paying that dealer any more labour was good too

Cheers All

Happy that the problem have been fixed.

Does someone try to upgrade his 2003-2004 with the 2005 auto light switch ?

Fr_Raf wrote:

Happy that the problem have been fixed.

Does someone try to upgrade his 2003-2004 with the 2005 auto light switch ?

Dave has, with mixed results I think.

Dave - care to give a run down? 

hi, yes its not a hard one, but you need the mk4 LCM and the later rain sensor, the auto light switch...that reminds me i still have yours dan! the LCM in its self can be hard to find but beware the LCM hold a record of the current mileage from the car it came from, so if you get one from an other car it will be very unlikely to have the same mileage and i don't think they can be reprogrammed {it can only be written to once}, again this is not a prob and does not affect the working of it but you will get a black dot appear in your display next to your mileage and this tells the trained eye that the mileage could have been altered. if you bought a new LCM they would programme it with the current mileage to avoid this.dealer only. but it will all work,i did have an issue with bulb warning lights coming up for the rear lights, fog light and reversing but that was down to the LCM coming from a x5 and apparent on them the system checks a few more things then the range rover but this was fixed using navcoder, i still have the LCM in my garage as i wanted to get it re-written before fitting it just to make it all as it should be, will have to drop Colin BBS SPY i am sure he has the equipment to reprogram them. V8 facelift Range Rover Autobiography 22" wheels.
1976 Harley Davidson Iron Head Sportster

hi,
Thank you for your answer...
If I have to change the LCM, I'm not sure I'll go for this option...
I naively thought that it was enough if I change the switch and sensor

check your LCM it may be a mk4 with auto lights, it lives at the bottom of the drivers A post, V8 facelift Range Rover Autobiography 22" wheels.
1976 Harley Davidson Iron Head Sportster

How can I recognize if it is a MK4 ?

it will have it on the unit it will also say auto lights... V8 facelift Range Rover Autobiography 22" wheels.
1976 Harley Davidson Iron Head Sportster

Thank you, I'll check that