I have a Xantia TDSX (93). My glowplugs are not getting power and I suspect either the control unit or associated post heating relay or post heater thermal switch (going by circuit diagram) and need to isolate the fault.
I can't hear the click I used to hear when the glow plug time was over and it was ready to crank. Seems like an earthing problem somewhere with the relays or the control unit.
Anyone know if the glowplug control unit is the Plastic box behind the battery about 2 in X 4 in and top side has an apex shape? Are the post heating relays the two small units next to it and what do they do? Is there a way to maually heat the plugs by flipping the relay? Else I am thinking of powering up the glow plugs directly for 5 seconds to see if I can start car that way. Any problem with that method as far as I avoid shorts!
Xantia Glowplug and Control
Moderator: RichardW
Right enough the control unit should be next to the battery. You may well have a post heating system and the relay for this should be with the engine bay fuses to the far left. As for flicking the relay - I got by with a direct connection via heavy cable with a Ford Fiesta but it didn't have an ECU. Your car may well have one so I would not stick my neck out and say yay or nay.
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