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This is very hard... I had my whole interior out for a refresh last year, and an alarm was part of the program of works, well immobiliser mainly.
It took me almost three months, of research, wiring discovery, fitting, testing, reworking and other things. Note I did a lot of wiring work including a complete e-wrap, installed a boot unlock solenoid and other things too in this time frame.
One thing that was the centre of it all was the Smart Entry Control unit, I ended up tapping a lot of things from here, like door unlocks, door open sensors etc.
For the immobilisation, I cut the fuel wire from the ECU, and the ignition on signal to the ECU.
The starter disable was harder, I ended up reversing the relays with a set of external relays to put this to ground.
All in all it was an epic fuckabout! And now my battery goes flat...
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