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Here is a small diagram that should help.
DTC INSPECTION (IMMOBILIZER SYSTEM) Security Light
WDS or Equivalent
I appreciate your help but I am not having any trouble codes on my car, what I need to do is to know the location of the Immobiliser module, I already have another ECU installed in my car but I haven't been able to start the engine because I haven't replace the immobiliser that goes with this new ECU, remember I am changing both the ECU and the Immobiliser and ignition switch with the keys from another junkyard found RX-8, if I don't change the immobiliser along with the ECU and keys then the engine won't start.