So I'm totally lost now ! Have ordered a replacement broke switch but I'm not that good at reading electrical diagrams , so at the relay in the boot i should get get voltage from the brake switch to transfer to the rear brakes and the high mount brake light ?
I have power to relay but no power everywhere else , if I connect the power to high mount light, the lights work .
Is this telling me the brake switch is no good , or does signal from switch go elsewhere ?

Any thoughts would be great !
Thanks Geoff

 

Is this before or after you changed the brake switch?

 

This is now before I have received the new brake switch

 

Do your other tail lights all work?
Did you try switching the relays?

 

The upper brake light is controlled directly from the brake light switch.
The lower tail lights are controlled from the Body Process Module (BPM).
The lower brake lights are controlled from the Security Control Locking Module (SCLM), after the brake switch is activated
The SCLM is located beneath the fuse box in the trunk/boot.
The SCLM contacts are known to corrode due to it's location. Try removing and cleaning the contacts once you have installed the new brake switch.
The brake light switch also controls the Cruise Control Function. There are 2 sets of contacts in the brake light switch.

 

I have tried switching relays but did not work, I will clean the contract on security module.
Thanks