5 Wire Alternating 12V Positive Door Locks Relay Wiring Diagram (the12volt.com)

This document is a wiring diagram titled "5 Wire Alternating 12V Positive Door Locks," hosted/watermarked by the12volt.com. It shows how to connect two standard 5-pin automotive relays (pins 30, 85, 86, 87, and 87a on each) to interface an alarm system's negative lock and unlock outputs with a vehicle's 5-wire alternating 12V positive door lock system. Each relay's pin 87 is fed from a fused 12V+ source (red wires). The alarm's negative unlock output (blue wire) triggers the left relay via pin 85/86, and the alarm's negative lock output triggers the right relay. Pin 30 of each relay connects to the unlock wire (purple) and lock wire (green) respectively, which run between the door lock switch and the door lock motors. The diagram indicates the switch connections at the top on both sides and the motor connections at the bottom. A reader can learn the relay pin assignments and wire routing needed to add aftermarket alarm/keyless-entry control to a positive-trigger 5-wire door lock system. The diagram is generic and does not state a specific vehicle make, model, or year.