Scheme 1
ECM RE-COMMUNICATING FUNCTION : Description
Performing following procedure can automatically perform re-communication of ECM and BCM, but only when the ECM has been replaced with a new one (*1).
*1: New one means an ECM which has never been energized on-board.
(In this step, initialization procedure by CONSULT-III is not necessary)
Note. When registering new Key IDs or replacing the ECM that is not brand new, refer to CONSULT-III Operation Manual. If multiple keys are attached to the key holder, separate them before work. Distinguish keys with unregistered key ID from those with registered ID.
SYSTEM DESCRIPTION
NATS (Nissan Anti-Theft System) has the following immobilizer functions
- Engine immobilizer shows high anti-theft performance to prevent engine from starting by other than the owner.
- Only a key with key ID registered in BCM and ECM can start engine, and shows high anti-theft performance to prevent key from being copied or stolen.
- Security indicator always flashes with mechanical key removed condition (key switch: OFF) and ignition knob released condition on LOCK position (ignition knob switch: OFF).
- Therefore, NATS warns outsiders that the vehicle is equipped with the anti-theft system. Refer to " «SYSTEM DESCRIPTION»(ref-396327-S39194630722011050400000) ".
- If system detects malfunction, security indicator illuminates when ignition switch is turned to ON position.
- If the owner requires, ignition key ID or mechanical key ID can be registered for up to 5 keys.
- During trouble diagnosis or when the following parts have been replaced, and if ignition key is added, registration* is required. *1: All keys kept by the owner of the vehicle should be registered with mechanical key. ECM BCM Ignition key Remote keyless entry receiver
- NATS trouble diagnosis, system initialization and additional registration of other mechanical key IDs must be carried out using CONSULT-III. When NATS initialization has been completed, the ID of the inserted mechanical key or mechanical key IDs can be carried out.
- Possible symptom of NATS malfunction is "Engine cannot start". Identify the possible causes according to "Work Flow", Refer to " «WORK FLOW»(ref-396327-S09929632282011050400000) ".
- If ECM other than Genuine NISSAN is installed, the engine cannot be started. For ECM replacement procedure, refer to " «ECM RE-COMMUNICATING FUNCTION : DESCRIPTION»(ref-396327-S04092834642011050400000) ".
Component Description
| Item | Function |
|---|---|
| BCM | Verifies the received signal from the ignition key ID, then informs ECM whether to allow engine start. |
| Remote keyless entry receiver | Receives lock/unlock signal from the keyfob, and then transmits to the BCM. |
| A/T shift selector (detention key switch) | Detects whether the shift lever is in park. |
| NATS antenna amp. | Detects the ignition key presence in the ignition key cylinder. |
| Security indicator | Indicates the status of the security system. |
| IPDM E/R | Powers-up the horn and the headlamps in case of a security breach. |
COMPONENT DESCRIPTION
Scheme 2
DESCRIPTION
The security system provides an audible and visual alarm when an unauthorized access to the vehicle is detected while the system is in armed phase.
The security system consist of the BCM managing the audible alarm (horn) and the visual alarm (headlamps).
Scheme 3
| Item | Function |
|---|---|
| BCM | Verifies the received signal from ignition key, then informs ECM whether to allow engine start. |
| Door switch | Provides the BCM with the status of each monitored door. |
| Security indicator | Indicates the status of the security system. |
| IPDM E/R | Controls the horn and headlamps operation. |
| Horn | Sounds when the vehicle security system is triggered. |
COMPONENT DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern vehicle is equipped with many electronic control unit, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Signal Chart, refer to " SYSTEM DESCRIPTION ".
CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern vehicle is equipped with many electronic control unit, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Signal Chart, refer to " SYSTEM DESCRIPTION ".
Performs ID verification through BCM and NATS antenna amplifier when ignition key is inserted and ignition switch turned ON.
Prohibits the start of engine when an unregistered ID of ignition key is used.
Performs ID verification through BCM when ignition knob switch is pressed.
Prohibits the release of steering lock or start of engine when an unregistered ID of mechanical key is used.
BCM performs the ID verification with ECM that allows the engine to start. BCM starts the communication with ECM if ignition switch is turned ON and starts the engine if the ID is OK. ECM prevents the engine from starting if the ID is not registered.
BCM performs the ID verification with ECM that allows the engine to start. BCM starts the communication with ECM if ignition switch is turned ON and starts the engine if the ID is OK. ECM prevents the engine from starting if the ID is not registered.
When the starting operation is carried more than five times consecutively under the following conditions, NATS will shift to the mode which prevents the engine from being started.
- Unregistered mechanical key is used.
- BCM or ECM's malfunctioning.
KING CAB : Description
The main power window and door lock/unlock switch detects condition of the door key cylinder switch and transmits to BCM as the LOCK or UNLOCK signal.
CREW CAB : Description
The main power window and door lock/unlock switch detects condition of the door key cylinder switch and transmits to BCM as the LOCK or UNLOCK signal.
Perform answer-back for each operation with horn.
- Vehicle security indicator is built in combination meter.
- NATS (Nissan Anti-Theft System) and vehicle security system conditions are indicated by blink or illumination of vehicle security indicator.