Go to the engine control relay if you have a Mitsu ECU'd GTi, or go to the twin relay blocks
It sounds like an alarm system problem, follow the procedures below
if you have a SIEMENS ECU powered GTi engine.
Location is behind the stereo area.
Find the white wire with red trace coming off the relay (Engine Control Relay is a gold metal box for Mitsu ECU'd GTi's). Follow it along and you might see it cut and joined to a black wire - that's one of the immobiliser wires.
Now keep looking under the dash heading towards the driver, you will find the white wire with red trace connected to another black wire - that's the other side of the immobiliser.
Basically white wire with red trace is cut in from factory loom. One end goes to immobiliser switch, other end goes to immobiliser switch. The immobiliser when switched on disconnects the power that joins them together.
Simply use a wire to join both ends of the white wire with red trace back together then try starting your car.
If that don't work, then theres a 2 stage immobiliser and unfortunately haven't played around with their dash looms much more than that as only the one wire was needed on the car I did.
Wednesday, March 4th, 2015 AT 8:01 AM