The E39 touring boot lid is electrically opened by electrically turning the rotary latch and by turning the lock striker towards open.
To release the rotary latch, a special drive with integrated restore spring is installed in the boot lid.
The release drive is activated by the basic module via an external relay.
The lock striker is turned by an electric motor. The drive is activated by means of a relay in the general module. The direction of rotation of the motor is the same for opening and closing.
A microswitch is initially integrated in the drive in order to detect the position of the motor and thus of the lock striker and to signal this to the general module. The switch switches ground to the general module when the motor has reached the "lock striker in bottom dead centre".
The boot lid can only be unlocked and opened when the vehicle is unlocked. This is triggered by:
The rear (boot) lid is closed by lightly pressing the lid. The rotary latch of the rear (boot) lid is mechanically turned to its initial position. The rear lid contact signals to the general module that the rear lid is closed. The electric motor connected to the lock striker is activated. The electric motor turns the lock striker thus pulling the rear lid closed.
The electrical closing function is also active when the vehicle is locked.
In the event of the electrical system failing, the rear lid can be mechanically released and opened from the inside using the mechanical emergency release via a bowden cable.
Besides the boot lid, the rear window is also released by an electric drive drive when the release button is pressed.
The release drive is activated by the basic module via an external relay.
The rear window release button is installed in the rear window wiper arm.
The rear window can only be released when the vehicle is unlocked.