[b3lha]

It looks pretty straightforward on the wiring diagram.

The security module controls a relay to interrupt the starter circuit. This relay is located up under the dash near where the wires come through from the engine compartment.

It's a 2x2 connector wired as follows:

Pin 1 Blue/Red is the power to the relay coil from fuse 23.
Pin 3 Blue/White is the other side of the relay coil connected to the security module. The module grounds this wire in order to close the relay, which connects pin 2 to pin 4 and thereby enables the starter.

Pin 2 Black/White is the power supply for the starter.
Pin 4 Blue/White goes to the starter via the Park/Neutral switch.