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Fixed Code Transponder Key Immobiliser System Details:
Components and their Locations:
Subaru’s with the fixed code transponder key immobilisers (MY96 - MY99) have a antenna in a circular black moulding around the ignition barrel. The antenna has four wires connecting the antenna to the immobiliser ECU, but rather than plug in directly, they plug in to the chassis harness. The immobiliser ECU has one 12 pin plug. It is made Siemens, and is mounted high up under the dash, near the centre of the car. 
If you are unsure whether your Subaru has a transponder key immobiliser or not, take the cowling off the steering column and remove the ignition switch from the back of the barrel (one screw), and start the car by turning the switch with a screwdriver, with the keys nowhere near the car. If it starts and runs happily, then if definitely does not have a transponder key. If it starts and runs briefly, but then stops, it has a transponder key.
Key Types:
You can tell by looking at some types of Subaru key whether the car has a transponder key system. The following photo shows the type of key that Subaru have used between MY96 and MY99 here in the UK. There are more types too, especially in other markets. They have a transponder chip behind the small cover next to the blade, visible below. However, this is not reliable, as you can’t tell what type of immobiliser is fitted (some later cryptographic transponder keys looked the same):
Using the Transponder k|ey Immobiliser system to Immobilise your VW:
If you are thinking of using the Subaru immobiliser to immobilisr your VE (as opposed to jest using it to make the engine run, please read Using the Transponder k|ey Immobiliser system to Immobilise your VW before doing so.
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