4x4 engagement/disengagement button on the dashboard to the left of the steering wheel and linked to a dial presenting a stylised diagram of the system with two yellow lights, one per axle. The first LED is always illuminated, the second lights up when the rear wheels are engaged.

an electropneumatic engagement/disengagement system composed of the following parts:
- a vacuum tank linked to the pipe that joins the brake servo to the intake manifold, a one-way valve maintains the vacuum
- solenoid valves in a special container in the engine bay to check the vacuum in the actuators
- Pneumatic actuators for engagement of the synchronised connection of the drive shaft to the gearbox outlet and the 'free' rear wheels by means of front-toothed sliding sleeves.