Quoting diggerman: My immobiliser failed as you describe during the summer. Trailered to Dartford for a replacement unit. Caterham told me that only approved companies can fit and that wires are not colour coded so that amateur fitting is virtually impossible.
Peter
Not quite true, although all the wires are black they are marked at the ends when new. If you are working on one that someone else fitted the the wires are colour coded inside the box. Amateur fitting is easy, There are 7 wires, a perm live, ig switched live and two pairs to break two circuits, one of which must be live when the engine is cranking. There is also one other for a door pin switch which is obviously not fitted on a 7. I've fitted two and I really do rate them.
Jason