Can Anyone Help Me With My Immobiliser (56k Immobilised)

[Guest yaztromo]

My immobiliser has been playing up. It will randomly stop the fuel pump from priming and stop any power getting to the starter motor. The best cure is to walk away and leave it for a few hours and it will be fine again. Until you go to the shops that is...

 

I've set about trying to remove it, but am a little out of my depth.

 

Here you can see the radio pickup for the keyfob (bottom) and the control box for the blinking lights and radio pickup which links back to the real control box (bottom right).

 

Buried in the centre console is the control box. The bottom cable goes to the radio control box. The top wires dissapear off with the engine loom.

 

Looks like a case of pulling the wires off and joining them together in the correct order? Can anyone offer some advice as to what to do before I dive in head first

Edited March 25, 2007 by yaztromo

[inferno 1]

normally pretty straightforward... the black wires will cut 3 circuits by the looks of it. one of them being the fuel pump.

 

follow the wires, may go to the fuse box.

 

if the wires solderd or scotchlocked onto another wire cut it out (the black one). if it appears to be between a cut in a wire, u need to rejoin the original wire, and cut the 2 black wires to it. ie the fuel pump wire used will be cut and each end rejoined to a black wire.

 

may not be the best explanation, but they are very easy to cut out when the cars in front of me.

 

however could u just have a sticky tachy relay? or a bad earth causing you problems?

[jim21070 2]

Those three white lumps are relays that are responsible for cutting the three circuits. IIRC, Fuel via Tachy relay, Ignition and Starter Solenoid.

 

Easy to test, trace to the relay contacts (there is usually a little connection diagram on each relay case) and check you have +12V each side of the relay contacts, showing the relay is "making" OK when the immobiliser is disarmed.

 

If you have only lost the fuel pump, as Inferno says, it is likely to be external to the immobiliser and the most likely culprit is the tachy relay.

 

Often the wires to the immobiliser are soldered into the main loom, just to make it that little bit more difficult for the tea leaf. Solder and looms in cars are not good bedfellows: the act of soldering makes the wire at the joint brittle and vibration, over time, casues the joint to let go.