Immobiliser issue after installing new battery.

[maxmc2]

I only have one key on the key chain, ive tried the other key too and the same thing.

Its odd because I can disconnect the battery and the first start after reconnecting is fine but after that back to this.

When I purchased the car all I got was the keys nothing else, it was in a crap state and I have brought it back to life so I don’t have the metal tag.

How can I get around this? Can I simply strip out the immobiliser?

[itavaltalainen]

Unplug the reader coil and see if the wires were pulled or bent. Inspect coil under steering column and wiring that end.

You can't just disconnect immobiliser, if it was that easy to bypass it would have hardly been put in

[maxmc2]

Hiya,

So i disconnected the battery and started the car again and read for codes whilst running.

I then got this code

00546 - Data Wiring faulty: Implausible Signal

Does that point to the reader coil as looking at the wires it all seems ok.

Thinking i should just bite the bullet and buy a new reader coil.

TIA

[itavaltalainen]

Nope, that indicates that k-line has a wiring fault..... That could be anywhere from ECU to CE, CE to immo, CE to ABS......

I.e. it's not reader coil (would have almost surprised me with the fault codes you posted earlier)

[maxmc2]

Ok cool.

What would you suggest looking at first if it were your car?

[itavaltalainen]

Take the central electrics out, the k-line terminal are on top of it.... can't remember what colour wire but think they were yellow-black.... you can check on the back of the obd plug next to ash tray.

[maxmc2]

Do you mean remove completely or check the continuity of the wires?

Thanks for your help

[itavaltalainen]

You can 'drop' the CE without disconnecting everything and then check continuity on the k-line wires (these you will need to disconnect - i.e. unplug ECU loom from ECU, unplug ABS, airbag and any other control boxes connected to k-line).

[maxmc2]

So its been confirmed that the immobiliser module is f**ked.

What are my options? Cheapest ideally.

TIA

[itavaltalainen]

Either get an immo defeat module and fit that instead of immo box (mind your insurance won't be happy) or you get another immo box off ebay (ideally with the pin) and get your keys matched to it and also match it to ecu.

Used mk3 immos go for 10-15 quid.... so not expensive really. But check what part number is written on yours and get the exact same.

If you know the pin on new immo box I can do the key matching remotely (you need a laptop with USB port and internet connection in the car).