All seat belts except the driver's seat belt are equipped with a special seat belt retractor.

When activated, the special seat belt retractor ensures the seat belt will not slacken once the child restraint system has been secured.

Installing a child restraint system:
Always comply with the manufacturer's installation instructions.
Pull the seat belt smoothly from the inertia reel.
Engage the seat belt tongue in the belt buckle.

Activating the special seat belt retractor:
Pull the seat belt out fully and let the inertia reel retract it again.
While the seat belt is retracting, you should hear a ratcheting sound. The special seat belt retractor is enabled.
Push down on the child restraint system to take up any slack.

Removing a child restraint system/deactivating the special seat belt retractor:
Always comply with the manufacturer's installation instructions.
Press the seat belt release button and guide the belt tongue to the belt outlet. The special seat belt retractor is deactivated.

WARNING
Never release the seat belt buckle while the vehicle is in motion, since the special seat belt retractor will be deactivated.