XM earthing problem

[jimbo]

When I press the brake pedal the dash lights dim slightly then recover also the central locking problem (locking unlocking itself) would appear to be linked (car locking and unlocking when slowing down ) could be coincidence where are the relevent earth points I should be looking for.Any help greatly appreciated.

[GreenBlood]

Jimbo,
Best advice I can give is to re-post on the XM-L Yahoo forum, this problem has been covered, a great bunch of sympathetic XM owners.
Cheers
Chris