Power Door Lock Relay Wiring

Using a mechanical latching relay like the pcb latching relay pictured here you can use a single negative output to alternately lock and unlock the doors.

Power door lock relay wiring.

Using a pair of needle nose pliers pull out the old relay. If your alarm or keyless entry has positive outputs only you will have to connect the other side of the coils to ground and connect your outputs as shown. The mechanical latching relay only requires it s coil to be momentarily energized to change and maintain the opening or closing of it s contacts. For those located under the dash in the middle of the cab behind the stereo.

Remove the old door lock relay. If the relay and switch are working properly but you re not getting power and ground at the door lock actuator check the wiring harness in the hinge area of the door. Should you need to add relays for a 3 wire negative type b door lock system just change both normally open terminals 87 from 12v to ground. Find the door lock relay.

That s where most wire breaks occur. Here s how a body control module power door lock system works.