I have a frontera and i need a wiring diagram so i can bypass the immobiliser

Contact napa

you cannot disable the immobiliser. it is a system mercedes has put into to prevent theft. however, you can bypass the immobiliser (otherwise known as EIS, Electronic Ignition Switch) in order to switch ON the car, but you wont be able to start it.
what you need to do it remove the connector from the back of the EIS module and bridge terminals 15r and terminal 30. i recommend getting a wiring diagram specific to your car to be sure of the terminals.

however, do this at your own risk.

you cannot disable the immobiliser. it is a system mercedes has put into to prevent theft. however, you can bypass the immobiliser (otherwise known as EIS, Electronic Ignition Switch) in order to switch ON the car, but you wont be able to start it.
what you need to do it remove the connector from the back of the EIS module and bridge terminals 15r and terminal 30. i recommend getting a wiring diagram specific to your car to be sure of the terminals.

however, do this at your own risk.

I regret ti inform you we have no wiring diagrams availiable

This is an (almost) impossible task. The immobiliser ECU which reads the key communicates with, and is controlled by, the engine ECU.
It's not possible to just "bypass" the system.
I said "almost" impossible because with the right tools, knowledge and unlimited time it may be possible to capture the code of a useable system, then design and build a black box to respond correctly to the engine ECU, which would allow engine operation.
If you have lost your only usable key, you need to order a new one (as you haven't indicated your exact model, I can't give you the correct part number - keys are different depending on model/engine).
You will also need a dealer who can programme a new key to your existing vehicle.
If your existing vehicle has problems with the immobiliser, you may be able to find a Toyota dealer to interrogate your OBD to see what the issue is. If not, replace the key transponder unit, then the ECU.
I've assumed you know it's an immobiliser issue, and that you've done the usual wiring and fuse checks etc.

hi mate you able to post up the diagram
cheers

immobiliser has set itself and usually wont reset unless you have the code for it,if you contact main dealer they might be able to help you with getting the code, if not take it to an auto electricain who might be able to bypass it

burn it

An immobilizer bypass is an electrical circuit which allows current to flow to whatever component is starved of current to keep the engine from running (usually the coil). The immobilizer opens the circuit to the coil, the immobilizer bypass closes the circuit to the coil.

If you didn't install an immobilizer circuit, then you don't need the bypass. There are probably instructions you missed in the manual explaining the immobilizer circuit.

dont think you will find one as evan the new haynes books dont have wiring diagrams only block diagrams as with the wiring diagram you can bypass the factory immobiliser.which means less work for the dealer when the immobiliser cuts in for what ever reason