1999 Nissan Maxima Owner's Manual - Page 79

KEYS your key number plate. A key number is only necessary when you have lost all keys and do not have one to duplicate from. If you still have a key, this key can be duplicated by your NISSAN dealer. The key number is necessary when you need extra Nissan Vehicle Immobilizer System keys. As many as 5 Nissan Vehicle Immobilizer System keys can be used with one vehicle. New keys must be registered to the Nissan Vehicle Immobilizer System components in your vehicle by your NISSAN dealer. At this time, you should bring all Nissan Vehicle Immobilizer System keys that you have to your NISSAN dealer for registration. This is because the registration process will erase all memory of the Nissan Vehicle Immobilizer System components. SPA0658 SPA0662A The master key can be used for all the locks. Record the key number on the key number plate and keep it in a safe place (such as your wallet), not in the car. A key number plate is supplied with your key. Keep the plate in a safe place. NISSAN does not record key numbers so it is very important to keep track of your key number plate. A key number is only necessary when you have lost all keys and do not have one to duplicate from. If you still have a key, this key can be duplicated by your NISSAN dealer or a locksmith shop. Nissan Vehicle Immobilizer System KEY Master keys (if so equipped): You can only drive your vehicle using the master keys which are registered to the Nissan Vehicle Immobilizer System components in your vehicle. These keys have a transponder chip in the key head. Never leave these keys in the vehicle. Record the key number on the key number plate supplied with your keys and keep it in a safe place (such as your wallet), not in the vehicle. NISSAN does not record any key number so it is very important to keep track of 3-2 Pre-driving checks and adjustments