I assume you want to flash the lights when you lock or unlock the car. The easiest thing to do is connect the remote module to the parking light wire. This will not flash the lights as brightly as when you are braking or using turn signals, but it will flash all of them, including the rear side markers, which are not flashed when turning or braking. That's how I hooked up my yellow car.
Another option is to connect it to the brake wire for the rear lights, and to the front turn signal wires through diodes, so as to not interfere with their normal operation. This is how I hooked up my silver car. The lights flash at full brightness, but the rear side markers don't flash.