Antitheft System - IVIS/Nats Key Registration Procedure: Overview
Classification:EL02-043
Reference:
ITB02-071
Date:
November 4, 2002
ENGINE WILL NOT START OR INTERMITTENT NO START ELECTRONIC KEY REGISTRATION PROCEDURE SYSTEM DESCRIPTION FOR IVIS/NATS
APPLIED VEHICLE:
2002 Q45 (F50)
APPLIED VINs:
All
APPLIED DATE:
Start of production
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 2002 Q45.
IMPORTANT:
The New NATS "C/U Initialization and Electronic Key Registration" Procedure in this bulletin is unique for the 2002 Q45. 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.
^ The NATS will not allow the engine to start without the use of a registered electronic ignition key. If a vehicle will not start and the Security lamp is on solid, it may be because the ignition keys were not properly registered into the vehicle's NATS IMMU (Immobilizer control unit). In this case, there will be a "DIFFERENCE OF KEY" code stored in the NATS IMMU.
^ If the NATS 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 not work together. The IMMU controls the information necessary to "tell" the ECM to start the vehicle.
THE FOLLOWING POINTS MUST BE FOLLOWED IF C/U INITIALIZATION AND ELECTRONIC KEY REGISTRATION ARE BEING PERFORMED:
^ Before proceeding with Electronic Key Registration all existing ignition keys to the vehicle must be collected from the customer. All prior key IDs will be erased once the process is started and the earlier keys will not start the vehicle. All ignition keys that are going to be used for the vehicle must be present, available and registered during Key Registration or THEY WILL NOT START THE VEHICLE.
Attention:
If all electronic keys are lost, refer to the "New Electronic Key Procedure".
^ To prevent transponder interference keep all NATS ignition keys and other transponders away from the key being registered during the Key Registration process (see NOTES ABOUT TRANSPONDER INTERFERENCE, below). This ensures the proper ID code for each key registered is stored into the NATS IMMU memory.
^ Do not "crank" the engine/operate the starter during the Key Registration Procedure.
^ Performing C/U initialization and key registration may not erase NATS DTC's stored in the ECM. YOU MUST CLEAR THE DTC's BY PRESSING ERASE IN THE SELF-DIAGNOSTIC RESULTS DISPLAY OF CONSULT
^ It is recommended that you read through the entire service procedure before doing it for the first time.
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 keys.
^ A maximum of five ignition keys can be registered to the NATS.
^ If any ignition keys need to be added or if any ignition key needs to be re-registered1 ALL other ignition keys must be re-registered at the same time or they will no longer start the vehicle.
Transponders:
^ If a NATS-equipped vehicle experiences an intermittent no start incident, interference from another transponder could also be the cause.
^ Other vehicle ignition keys that have transponders, or transponders such as the Mobil Speedpass(R) (see illustration) may be a source of interference if they are too close (3/4 to 1 inch) to the registered key being used to start the vehicle.
^ In these cases, there will be a "DIFFERENCE OF KEY" code stored in the Engine Control Module (ECM). The MIL will not turn "ON" for this condition.
^ Once the vehicle is started, transponder interference will not cause the engine to stall.
^ To avoid transponder interference occurrences, advise the customer to keep all other transponders on separate key rings.
System Components (see Figure 2).
^ NATS ignition key.
^ NATS antenna amplifier, located around the ignition key cylinder.
^ NATS Immobilizer control unit (IMMU): located behind the driver's side lower knee panel.
^ Engine Control Module (ECM), located under the console, below the instrument panel.
^ Security indicator (Light Emitting Diode, or LED), located on the dash.
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 ignition key) and the IMMU. When a registered NATS 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.
^ NATS does not activate the vehicle theft warning system.
^ Each vehicle is supplied with three registered keys.
^ A maximum of five ignition keys can be registered to the NATS.
^ If any ignition keys need to be added or if any ignition key needs to be re-registered, ALL other ignition keys must be re-registered at the same time or they will no longer start the vehicle.
CONSULT-II NATS Program Card:
^ For CONSULT-II, use the NATS Program Card. CONSULT-II is fully compatible with early and later vehicles.