Door Locks: Description and Operation

Battery voltage is supplied at all times to the Power Door Lock system through the PWR ACC Circuit Breaker and the ORN/BLK (60) wire. Ground is provided through the BLK (150) wire at the Busbar Ground.

When either Door Lock Switch is operated, the doors will lock or unlock. Each Lock can also be operated manually. The Locks are operated by reversible motors. The Door Lock Switches operate to turn the Motors on by supplying battery voltage to one of the terminals.

When either Door Lock Switch is moved to the LOCK position, 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 LH Door Lock Switch to the BLK (150) wire and 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.

When either of the Door Lock Switches is moved to the UNLOCK position, 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.

If the Door Lock Switches are held closed, a circuit breaker in each Motor will open to protect against damage. The circuit breaker close automatically when they cool off.