Hm, didn't realise just how much stuff I already had until I started looking.
Here's something essential to get you started:
- Zeljko Nastasic and Gabor Deak Jahn's
'The Citroën Technical Guide' in PDF format.
616k of absolutely invaluable information about what makes XMs tick - with illustrations. This very readable offering will help you understand the XM's complex systems more fully and is of great assistance in diagnosing problems. Download
More coming real soon!