Join Date: Aug 2006
Location: Stuck in Indianapolis until the end of time
If you want to change the wiring harness, you would need to change everything:
Harness from each door
TCM, PCM, BCM, skim lock and key.
If you do not change the door locks, you will end up with two keys
When you change the BCM you will inherit the mileage from the 300 (which could be good)
Also consider the 300 probably has ABS and the Trep does not so, you will end up with an ABS light.