Lock buttons on doors

The lock buttons on the doors lock and unlock the respective doors mechanically.

Fig 1: Identifying Lock Button In Door

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Identifying Locking And Unlocking Mechanism

Courtesy of SAAB-SCANIA OF AMERICA, INC.

If any of the doors are unlocked using the lock button while the car is locked and then the door opened, the TWICE control module will detect it via the door switch. When the door is closed again and locked with the key, the remote control or the button on the center console, the central locking system will first unlock the door and immediately lock it again.

This is done to reset the locking mechanism so that the lock motor will be able to lock the door again.

When you open one of the doors with the lock button, the TWICE control module handles the driver's door and passenger door separately but the rear doors together.