Body Electronics and Lighting
Review parked-vehicle power, wake paths, and load-specific drivers across body modules.
Body Control, Lighting and Vehicle Networks
A body control module combines low-power control, vehicle communication, and drivers for loads such as lamps, relays, heaters, and small motors. These loads differ in startup current, fault behavior, and diagnostic requirements, so a common output-current rating does not make their drivers equivalent.
Evaluate parked-vehicle power consumption and wake-up behavior alongside load operation. CAN/LIN transceivers, regulators, and output drivers can remain active in different low-power states, and the system must wake through the intended network or local input.
Component Requirements
Typical functions, devices, and parameters in Body Electronics & Lighting.
| System function | Typical devices | Key parameters | Browse |
|---|---|---|---|
| Low-power body control Coordinates comfort functions, local inputs, and network wake events. | Automotive MCUs, supervisors, SBCs | Sleep states, wake inputs, I/O | View category |
| Switched loads and lighting Drives lamps, relays, heaters, and small motors with load-specific diagnostics. | LED drivers, high-side switches, motor drivers | Inrush, inductive energy, diagnostics | View category |
| CAN and LIN interfaces Connects body modules to vehicle networks and remote nodes. | CAN and LIN transceivers | Wake behavior, bus mode, fault handling | View category |
Design & Selection Considerations
Sleep-to-wake sequencing
Map which supplies remain enabled, which network or local event wakes the module, and how the MCU regains control after the regulator starts.
Load-specific diagnostics
Select the required open-load and short-circuit indications for each output. Check whether diagnostic operation changes when the load is off or PWM is used.
Supply Chain Considerations
Driver and SBC substitutions
Record load type and the required diagnostic interface with the original part number. A matching package does not confirm current-sense scaling, fault reporting, or low-power control behavior.
Frequently Asked Questions
Include every circuit still powered in the chosen sleep state: the regulator, MCU, CAN/LIN receiver, wake inputs, and relevant driver diagnostics. Compare the complete sleep and wake sequence, rather than relying on a transceiver's lowest listed current in isolation.
Consider startup current, inductive turn-off energy, current limiting, thermal shutdown, and open-load or short-circuit diagnostics. LED current regulation and motor direction control require different functions from a simple high-side load switch.
No. CAN and LIN use different physical layers. Within the chosen network, verify bus modes, wake detection, logic interface, supply arrangement, and fault behavior. A different sleep-control sequence can require changes to both power management and firmware.