Just be careful an aftermarket unit that didnt have 3 second hold for the locks (usually using bosch relays to accomplish) can burn up the central locking wiring along with the door sensor/trunk lock wires. I have replaced about 20 wires from a unit that looked wired correctly with bosch relays and it still did things tha may never really be ever fixed. And yes all lines had fuses, but it looks like a slow burn if you know what I mean.

Once I removed and re-ran wires and resoldered I have been trouble free for the most part.