I had a similar problem with my Xantia 2.0 HDI x reg, the positive battery terminal had corroded internally where it meets the wiring harness, this caused the relays to all start clicking and gave the "orange lamp" problem together with the fuel pump failing to initialise and give intermittent starting.The cure was to remove the battery, replace the positive battery terminal and cut the wiring harness back to clean metal and reattach the new terminal. It was a job in itself to get all the wiring harness into the terminal so best do it if you know someone with some very large electrical crimpers so you can add a new piece of battery cable to your existing harness wires, finally insulate with some plastic sheathing and some loom tape, before refitting the battery. If this is your problem. It seems to be a common fault I have come across it several times now. Good luck. Mark
mark parsons
March 2009