Antitheft System - Key Registration/Description: Overview
Classification:EC02-028a
Reference:
ITB02-068a
Date:
April 13, 2004
ENGINE WILL NOT START
ELECTRONIC KEY REGISTRATION PROCEDURE SYSTEM DESCRIPTION FOR IVIS / NATS
This bulletin amends ITB02-068. This version amends the Applied Vehicles. Please discard all paper copies of the earlier version.
APPLIED VEHICLES:
2003 - 2004 Q45 (F50)
2003 - 2004 M45 (Y34)
NOTE:
2002 Q45 is NOT covered by this bulletin.
SERVICE INFORMATION
^ This bulletin covers a new version of the Infiniti Vehicle Immobilizer System/Nissan Anti-Theft System (IVIS/NATS). This system referred to as NATS is standard equipment on the 2003 - 2004 Q45 and M45.
IMPORTANT:
The NATS "C/U Initialization and Key Registration" Procedure in this bulletin is unique for the 2003 - 2004 Q45 (not 2002 MY Q45) and 2003 - 2004 M45. Do not use this procedure on any other NATS.equipped vehicles.
^ NATS uses advanced anti-theft functions which are "password protected". This helps prevent unauthorized access into the NATS registration procedure.
^ If the NATS electronic ignition key vehicle's ECM or NATS IMMU* have been replaced C/U Initialization and Electronic Key Registration MUST BE PERFORMED OR THE VEHICLE WILL NOT START.
^ C/U Initialization and Electronic Key Registration is also necessary when: 1) "registering keys 2) as part of many NATS Service Manual diagnostic procedures.
* NATS Immobilizer Control Unit (IMMU)
NOTE:
The ECM and IMMU do work together. The IMMU controls the information necessary to "tell" the ECM to start the vehicle.
Attention:
If all electronic keys are lost, refer to the "New Electronic Key Procedure".
Special Service Notes:
Electronic Key Registration Required
^ NATS will not allow the engine to start without the use of a registered electronic ignition key. Previous and current Infiniti models with NATS have a "transponder chip in the ignition key head.
^ If a vehicle will not start and the Dash Security lamp is on solid it is possible that the electronic ignition keys were not properly registered into the vehicle's Engine Control Module (ECM).
^ When the NATS electronic ignition key or ECM are replaced C/U Initialization and Key Registration MUST BE PERFORMED or THE VEHICLE WILL NOT START. This same procedure is also needed when registering new keys.
^ If any electronic ignition keys need to be added or if any electronic ignition key needs to be re-registered ALL other electronic ignition keys must be re-registered at the same time or they will no longer start the vehicle.
Other Important Information
^ The NATS key code is permanently encoded to the NATS key ID chip at the time of its manufacture and cannot be changed. It is recommended to use Infiniti service parts (key blanks).
^ NATS does not activate the vehicle theft warning system.
^ Each vehicle is supplied with three registered electronic keys.
^ A maximum of four electronic ignition keys can be registered to the NATS.
Transponders
^ If a NATS-equipped vehicle experiences an intermittent no-start condition another "transponder" could be causing interference (blocking the signal).
Examples of transponder interference:
> Other vehicle ignition keys that have transponders ("key I.D. chips). Either from the same vehicle or another model.
> Transponders such as the Mobil Speedpass(R) may be a source of interference (see figure to the right).
> These items may be too close (3/4 to 1 inch) to the registered key that is being used to start the vehicle.
^ In cases of interference from other keys or transponders there will be a "DIFFERENCE OF KEY" code stored in the Engine Control Module (ECM). The MIL will not turn "ON" for this code.
^ Once the vehicle is started transponder interference will not cause the engine to stall.
^ To avoid transponder interference, advise the customer to keep all other transponders on separate key rings.
System Components (see Figure 1)
^ NATS electronic ignition key (with transponder chip).
^ NATS antenna amplifier located on ignition key cylinder housing.
^ NATS IMMU (Immobilizer control unit) located behind the driver's side lower knee panel.
^ Security indicator lamp (Light Emitting Diode or LED) located on the dash.
^ Engine Control Module (ECM) located behind the glove box.
^ Steering Lock Control Unit located on the ignition key cylinder housing.
System Operation
^ The NATS uses a digital radio frequency (RF) to transmit a key code between the NATS key ID chip (which is "embedded" in the NATS electronic ignition key) and the IMMU. When a registered NATS electronic key transmits a valid code the ECM will allow the engine to start.
^ If the correct code is not received the IMMU will not transmit a valid code to the ECM. In which case the ECM will not let the engine start.
Disclaimer