R33 Factory Immobiliser

[JimX]

I've got what seems to be a factory immobiliser which I think is playing havoc with my car and preventing it from starting. Originally it was just stopping the spark, but after I unplugged it and plugged it back in, the fuel pump now pulses off and on several times a second continuously when I switch the ignition on, instead of priming for 5 seconds. Once it also primed for 5 seconds, then stopped for a few seconds, then primed for another 5 seconds, etc. But now it's just in the "pulse" mode.

Can someone please give me rough guidelines about how to ditch the factory immobiliser permanently? I only got 1 key with the car and no remote button, so even if it's just armed rather than broken I've got no way of ever disarming it. I already have an aftermarket immobiliser installed (by someone else) and I think this might have damaged something else when installed alongside the factory immobiliser. I didn't know it had a factory immobiliser until I ripped the dash apart to find out what was going on.

If someone can pm me the pin in-outs on the green plug that would greatly appreciated. I can provide proof that I own the car, plus photographs of what I've disassembled so far if need be.

The fuel pump problem is a major concern though, I'm starting to think that my ECU might be partially fried due to this wiring mess. Someone want to lend me an ECU as well?

[RANDY]

Factory immobiliser??

If it had a dealer-optional immobiliser or something, your alarm installer must have been drunk to run two at the same time.

Try posting those pics up, cause Chris and some others can tell what kind of alarm it is by the box or numbers on the box.

[Chris Rogers]

pm replied. let me know what you find.

[JimX]

Thanks Chris, working on it now with your advice

[JimX]

Ok I've got most of the immobiliser loom removed, just tricky getting to the last bit on the inner guard. I'll worry about that later.

What I've now found is a bunch of wiring in the boot, with some clearly aftermarket splicing going on, probably related to the immobiliser due to using the same plastic joiner things. There are 2 items which weren't in my GTS-t and even though it has a Nissan stamp on it, I can't understand why it would need this dodgy spliced wiring. The object in the last pic has some wires which go into the fuel pump loom, but I don't know if they have anything to do with the fuel pump. It makes no difference to anything if I disconnect this bit, the fuel pump still pulses off and on when the ignition is on.

Pic descriptions, in order:

1. Nissan stamp 47850 24U00 on top of the box I removed with all the wires going into it.

2. The total mess of spliced wiring behind the object.

3. The space from which I removed the object.

4. Weird object that doesn't make a difference when I unplug it.

Can someone help me identify anything here and what I should do with it all?

[raz0r$harP.UK]

47850 24U00 comes up in FAST as "A Module Skid" - I'm guessing ABS?

[JimX]

Ah, I think I figured out what it is. There's an electronic torque splitter in the dash. It must be wired into the 4WD module to control the settings. I don't know what that other module is but I don't think it matters. Time to look elsewhere. Well, time to go to bed first (sigh)