Door Locks: Description and Operation

When a Door Lock Switch is activated in the Power Door Lock system, both 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. The Door Lock Switches operate the Motors by applying a voltage to one of the terminals and a ground to the other terminal.

Battery voltage is applied to both Door Lock Switches at terminal "A" at all times. When the LH Door Lock Switch is moved to "LOCK," battery voltage is applied to both Door Lock Motors through the GRY (295) wires. Both Motors are grounded through the TAN (294) wires, the UNLOCK contacts of the LH Door Lock Switch, the LT BLU (195) wire, the UNLOCK contacts of the RH Door Lock Switch and the BLK (150) wires to ground G202.

When the LH Door Lock Switch is moved to "UNLOCK," battery voltage is applied to both Door Lock Motors in the opposite direction through the TAN (294) wires. Both Motors are grounded through the GRY (295) wires, the LOCK contacts of the LH Door Lock Switch, the BLK (194) wire, the LOCK contacts of the RH Door Lock Switch and the BLK (150) wires to ground G202.

When the RH Door Lock Switch is moved to "LOCK," battery voltage is applied through the LT BLU (195) wires, the LOCK contacts of the LH Door Lock Switch and the GRY (295) wires to both Door Lock Motors. When the RH Door Lock Switch is moved to "UNLOCK," battery voltage is applied through the BLK (194) wire, the UNLOCK contacts of the LH Door Lock Switch, and the TAN (294) wires to both Door Lock Motors in the opposite direction. During RH Door Lock Switch operation, the Door Lock Motors are grounded similarly to the way they are grounded during LH Door Lock Switch operation.

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.