found this on the tinterweb give it a try
LAGUNA II INFRA RED RESYNCHRONISING
1. Turn the Ignition OFF.
2. Press the central door locking button for more than 5 seconds. Note: the door should lock then unlock.
3. When this happens 15 seconds is allowed and the immobiliser warning light illuminates.
4. Point the 1st key at the receiver and press the button once, the doors should lock and unlock.
5. Point the 2nd key at the receiver and press the button once, the doors should lock and unlock.
6. Check the remote control unlocks and locks the doors.
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Dave (Nottingham)
April 2008