Description & Operation: Notes

CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

When a Door Lock Switch is activated in the Power Door Lock System, all of the doors will lock or unlock in unison. Each Lock can also be, operated manually from the locking post. The Locks are operated by reversible Motors that receive voltage from two relays in the Power Lock Relay Assembly. These relays operate to turn the motors on by applying a voltage to one of the terminals and a ground to the other terminal.

When either Door Lock Switch is moved to the LOCK position, it completes the circuit to the coil of the Power Lock Relay Assembly. The Lock Relay is energized. The contact for the Lock Relay closes and is connected to battery voltage through the ORN/BLK wire which is the high current feed for driving the Motors.See WIRING DIAGRAMS . A similar action occurs with the Unlock Relay when it is energized by either of the Door Lock Switches closing to the UNLOCK position. Now the TAN wires to the motors carry battery voltage and the GRY wires are grounded. See WIRING DIAGRAMS . The polarity of the voltage to the Motors has reversed and the Motors run in the opposite direction to unlock the doors.

A similar action occurs with the Unlock Relay when it is energized by either of the Door Lock Switches closing to the UNLOCK position. Now the TAN wires to the motors carry battery voltage and the GRY wires are grounded. The polarity of the voltage to the Motors has reversed and the Motors run in the opposite direction to unlock the doors.

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

The Tailgate Power Lock System operates in a similar manner.