Here s a power door lock wiring diagram for a 2009 chevrolet malibu.
Power door lock relay wiring.
Remove the old door lock relay.
That s where most wire breaks occur.
Here s how a body control module power door lock system works.
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.
Remove the panel that covers the area under the stereo.
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.
For those located under the dash in the middle of the cab behind the stereo.
Locate the door lock relay.
Find the door lock relay.
Using a pair of needle nose pliers pull out the old relay.