Your vehicle can only be driven with the Intelligent Keys which are registered to your vehicle’s Intelligent Key components and NISSAN Vehicle Immobilizer System components.
Never leave these keys in the vehicle.
As many as 4 Intelligent Keys can be registered and used with one vehicle. The new keys must be registered by a NISSAN dealer prior to use with the Intelligent Key and NISSAN Vehicle Immobilizer System of your vehicle. Since the registration process requires erasing all memory in the Intelligent Key components when registering new keys, be sure to take all Intelligent Keys that you have to the NISSAN dealer.
CAUTION
Listed below are conditions or occurrences which will damage the Intelligent Key:
If an Intelligent Key is lost or stolen, NISSAN recommends erasing the ID code of that Intelligent Key from the vehicle.
This may prevent the unauthorized use of the Intelligent Key to operate the vehicle.
For information regarding the erasing procedure, contact a NISSAN dealer.
Mechanical key

The Intelligent Key contains the mechanical key.
To remove the mechanical key, release the lock knob on the back of the Intelligent Key.
To install the mechanical key, firmly insert it into the Intelligent Key until the lock knob returns to the lock position.
Use the mechanical key to lock or unlock the driver’s door.
CAUTION
Always carry the mechanical key installed in the Intelligent Key slot.
See “Doors” in this section.
Keys
NISSAN Vehicle Immobilizer System keysPrecaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”,
used along
with a front seat belt, helps to reduce the risk or severity of injury to the
driver and front passenger for certain
types of collision. Information necessary to service the system ...
Wiring diagram
Ipdm e/r (intelligent power distribution module engine room)
Wiring diagram
...
B142A Ignition voltage
Description
DTC B142A IGNITION VOLTAGE
Ignition voltage is supplied to the air bag diagnosis sensor unit when the
ignition is in the ON position. The air
bag diagnosis sensor unit will monitor for low or high ignition voltage.
PART LOCATION
Refer to SRC-5, "Component Parts Location" ...