Body Domain Controller

KCU BCM

A body domain controller for electric buses and commercial vehicles, integrating front/rear BCM, lighting, doors, HVAC, wipers, ADAS/IVI power, and high-density 24V load control.

Positioning

A body domain controller for electric buses and commercial vehicles, integrating front/rear BCM, lighting, doors, HVAC, wipers, ADAS/IVI power, and high-density 24V load control.

Uses the Master BCM as the reference architecture to show one controller's power, communication input, MCU, and output-driver configuration.

Integrates CAN FD, LIN, Ethernet, MSDI, analog, capture input, and RTC for HVAC, T-box, VCU, ADAS/Camera, and body subsystems.

Designed for 24V commercial-vehicle loads across high-side, low-side, half-bridge, and high-current power switching.

System Architecture

Supply / Input

Buck-Boost 9-32V to 12V

5V Sensor Supply

CAN0 / CAN1 / CAN2

LIN0

MSDI SG00-SG27

Analog VI00-VI03 / RI00-RI03

Capture CI00-CI03

Ethernet 100BASE-T1

RTC

Control Core

MCU 257p Master

Power Switch / Driver

HSD 30A

HSD 20A

HSD 15A

HSD 5A

HSD 3A

HSD 1A

Half Bridge 4.5A

LSD 3A

Specifications

Control Core

Architecture	Master BCM reference architecture
MCU Pins	257p
Domain	Body domain state machine and distributed I/O control
Protocol	Dedicated Inter-BCM protocol over CAN FD

Communication & Input

Vehicle Network	CAN0, CAN1, CAN2, LIN0, Ethernet 100BASE-T1
Digital Input	MSDI SG00-SG27 / SP00-SP15
Analog Input	0-5V and 0-100K resistive sensor input
Capture Input	0-10 kHz capture input

Power Supply

Vehicle Supply	BAT+ / IGN input with ideal diode protection
Power Conversion	Buck-Boost 9-32V to 12V
Sensor Supply	12V and 5V sensor supply outputs
Power Rails	VDD_HV_A, VDD_5V, VBATP distribution

Output Drivers

High Side Switch	30A / 20A / 15A / 5A / 3A / 1A output groups
Half Bridge	24V / 4.5A half-bridge outputs
Low Side Driver	24V / 3A low-side driver outputs
Protection	Open-load, short-to-ground, short-to-battery, over-current and over-temperature diagnosis

Software Functions

A body domain controller for electric buses and commercial vehicles, integrating front/rear BCM, lighting, doors, HVAC, wipers, ADAS/IVI power, and high-density 24V load control.

Body Domain State Machine

Door Safety Logic with speed interlock and anti-pinch evaluation

Cooling / fan derating algorithm

Diagnostic Manager and fault aggregation

Lighting strategy engine

Wiper / washer logic with VCU-driven modes

ADAS / IVI power management with delay-off logic

Security Manager with MAC, freshness counter and authentication

Inter-BCM protocol handler

Need BCM architecture planning or custom I/O?

We can help plan BCM integration around vehicle platform topology, front/rear body layout, 24V loads, diagnostics, and Inter-BCM communication.