Power Locks: Description and Operation

LH/RH DOORS
When a Power Door Lock Switch is operated, all 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 PWR ACCY Circuit Breaker. The Power Door Lock Switches operate to turn the motors on by supplying battery voltage to one of the terminals and by grounding the other terminal.

When either Power Door Lock Switch is moved to the LOCK position, the circuit to the motors is complete. Voltage is supplied to the GRY (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 and through the Door Lock Relay to the BLK (150) wire arid Ground G200. The motor in each door runs to operate the Power Door Locks. When the Power Door Lock Switch is released, the circuit is opened, and the motors turn off.

A similar action occurs with either of the Power Door Lock Switches closes to the UNLOCK position. The TAN (294) wires to the motors supply battery voltage and the GRY (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 Power Door Lock Switches are usually closed for just a moment. If the Power 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.

REAR CARGO DOORS
The Rear Cargo Doors must be fully closed for the Power Door Lock Motor to operate. The Power Door Lock Motor is located in the RR Cargo Door. Contactors are located on the Rear Cargo Door opening on the body and also on the RR Cargo Door.