Power Door Lock Actuator Wiring Diagram
Direct Answer and Scope
A power door lock actuator wiring diagram shows how the actuator motor, door lock switch, body control module or relay, fuses and grounding points connect. In most conventional systems, the actuator is a two-wire DC motor that reverses polarity to lock or unlock. One wire receives positive voltage while the other is grounded; reversing the polarity changes the motor direction. The exact diagram varies by model year, generation, trim and whether the vehicle uses a body control module, central timer or direct switch-to-actuator circuit. Always use a diagram specific to the vehicle identification number or exact model and year rather than a generic image.
Typical Actuator Wire Functions
Many aftermarket and older factory actuators use five wires or two wires. In a five-wire actuator, two wires feed the motor. The remaining three often connect to an internal position switch used for keyless entry or alarm feedback. The switch wires are usually common, normally open and normally closed. In factory systems, wire colors are not standardized across makes. Common colors include blue, green, white, brown, black, gray, orange, yellow and purple, but the function can differ even between model years of the same vehicle.
Basic Two-Wire Reversing Circuit
Switch rest position: both actuator wires grounded through switch; Lock command: wire A = +12V, wire B = ground; Unlock command: wire A = ground, wire B = +12V; Actuator motor terminals are not fixed as positive or negative; direction depends on which wire receives voltage.
In this arrangement the switch or module prevents simultaneous voltage on both motor wires. Some vehicles insert a relay between the switch and actuator. Relay-based circuits may use separate lock and unlock relays, each supplying one polarity to the actuator motor.
Body Control Module Systems
Newer vehicles often route lock requests through a body control module. The door switch may be a low-current signal wire to the module, not a direct power feed to the actuator. The module then drives the actuator through internal relays or transistor outputs. In these systems the actuator can have two motor wires plus a small harness for an integrated anti-pinch or position sensor. A diagram must show the module connector pin, fuse, ground and actuator connector pin.
Common Diagram Elements
Battery or fused power source; Door lock fuse or circuit breaker; Door lock switch or keyless entry module; Lock and unlock relays, if equipped; Body control module, if equipped; Actuator motor and internal switch wires; Ground points
Testing With a Wiring Diagram
Use the diagram to identify the actuator motor wires and the expected voltage during lock and unlock. With the connector back-probed, expect approximately battery voltage on one motor wire while the other is near ground. If voltage is present at the actuator but the motor does not run, the actuator may have failed. If voltage is absent, check the switch, relay, module, fuse or wiring in that order according to the diagram. Do not apply direct battery voltage to a module-controlled wire without confirming it is a motor feed; doing so can damage solid-state drivers.
When a Diagram Is Not Available
If no vehicle-specific diagram is available, trace the actuator connector wires. A two-wire actuator can be identified by measuring resistance between the suspected motor wires while operating the switch. Reversing test leads should show continuity through the motor. Wires from the internal switch, if present, should change continuity state as the actuator rod moves. This method is supportive but does not replace a factory diagram for module or relay diagnosis.
Model-Year and Trim Qualifications
The same model can change actuator wiring between generations or option packages. A vehicle with keyless entry and alarm may use a five-wire master actuator on the driver door and two-wire slave actuators elsewhere. A base trim without keyless entry may use direct switch control. Always confirm whether the diagram applies to the specific trim, market and production date before making wiring repairs or adding an aftermarket actuator.