K 1500 Truck 4WD V6-262 4.3L VIN Z (1993)
Power Door Lock Actuator: Description and Operation
Regular Cab and Extended Cab
When a Door Lock Switch is operated, both of the doors will lock or unlock. Each lock can also be operated manually. The locks are operated by
reversible motors that receive voltage from the ACC-BATT Circuit Breaker. The Door Lock Switches operate to turn the Motors on by supplying battery
voltage to one of the terminals and ground the other terminal.
When either Door Lock Switch is moved to the LOCK position, it completes the circuit to the Motors. Voltage is supplied to the GRA (295) wire and
to the Door Lock Motors, which are grounded by the TAN (294) wire from the other terminal of the Motor through the other switch contact to ground.
The Motor in each door runs to operate the Door Locks. When the Door Lock Switch is released, the circuit is opened and the Motors turn off.
A similar action occurs with either of the Door Lock Switches closing to the UNLOCK position. Now the TAN (294) wires to the Motors supply
battery voltage and the GRA (295) wires are grounded. The polarity of the voltage to the Motors has reversed. The Motors run in the opposite direction
to unlock the doors.
The Door Lock Switches are usually closed for just a moment. If the Door Lock Switches are held closed, a circuit breaker in each Motor will open to
protect against damage. The circuit breakers close automatically when they cool off.
