I've recently acquired a 2004 Buick Rendezvous, which has an aftermarket remote start unit installed (Excalibur RS-450-EDP+). Unfortunately, the previous owner did not hook up the remote entry feature.
After some initial research, it appeared that a separate unit was required to connect between the remote start and the vehicle. After more research, it appears that maybe a simple resistor is all that's required.
According to the documentation(PDF), the remote start unit wiring looks like this.
According to this document (PDF), Lock is a negative trigger through a 470 ohm resistor, and unlock is a straight negative trigger.
Can I simply install a 470 ohm resistor on the Green wire from the remote start unit. Then combine the other end of the resistor, with the Blue wire from the remote start, and the Red/Black wire in the vehicle?
Or do I have to purchase an additional unit?
These Installation Instructions (PDF) seem to agree.
Single Wire (Dual Voltage): Late model Chrysler/Dodge/Plymouth Vehicles, some 2000-UP GM Cars Dual Voltage systems have lock/unlock switches that send varying levels of Positive voltage OR Negative ground current to the SAME wire for both lock and unlock. When the vehicle’s Body Computer Module (BCM) or door lock module senses different voltages on this wire, the system will either lock or unlock. Single wire door lock systems require resistors.
And even provide a diagram similar to the one I've created.