CAN Buses

The Nissan Leaf uses multiple CAN buses. The two most researched and most important are EV-CAN and CAR-CAN.

CAR-CAN (or VEHICLE CAN)

This bus connects various low-voltage control systems, including:

• Vehicle Control Module (VCM)
• Intelligent Power Distribution Module (IPDM)
• Combination Meter
• Vehicle Sound for Pedestrians (VSP) module
• Body Control Module (BCM)
• CAN Gateway

EV-CAN

This bus connects the high-voltage components, plus the VCM. Devices on this bus:

• Vehicle Control Module (VCM)
• Traction Motor Inverter
• Power Delivery Module (PDM)
• Air Conditioning system
• Lithium Battery Controller (LBC)
• CAN Gateway

CHASSIS-CAN

Devices on this bus:

• Steering angle sensor
• EPS Control Unit
• Chassis Control Module
• Electric parking brake
• Brake control module
• ABS system
• CAN Gateway

ADAS-CAN

Stands for "Advanced Driver Assistance System". This bus appears to just connect the ADAS Control Unit to the CAN Gateway in order to allow it to communicate with devices on other buses.

Devices on this bus:

• ADAS Control Unit
• CAN Gateway

ITS-CAN

ITS may stand for "Intelligent Transportation Systems".

Devices on this bus:

• Distance Sensor
• Lane Camera Unit
• ADAS Control Unit

ITS2-CAN

ITS may stand for "Intelligent Transportation Systems".

Devices on this bus:

• Around View Monitor Control Unit
• Side Radars (left and right)
• CAN Gateway

AV-CAN

Only for ZE0/AZE0. Connects the buttons surrounding the AV Control Unit to the AV Control Unit.

IC-CAN

Appears to be a point-to-point link between the ADAS Control Unit and the Chassis Control Module.

IT-CAN

May stand for "Information Technology".

The functionality of the IT-CAN bus is not well-documented. Devices on this bus:

• Telematics Control Unit (TCU)
• AV Control Unit
• CAN Gateway

M-CAN

Devices on this bus:

• Telematics Control Unit (TCU)
• Combination Meter
• AV Control Unit

External Links

• https://github.com/dalathegreat/leaf_can_bus_messages