OEM Buyer Guides & Engineering Resources
Commercial-vehicle electronics buyer guides for OEM teams — compare product options, define key specifications and prepare better sourcing questions.
Product-family technical guides
Start with the main product families before choosing a specific buyer guide.
Power Distribution Box: functions & OEM applications
Fuse boxes, relay boxes and junction boxes for commercial vehicles, and how to tell which one a job actually needs.
Read guideSmart Control Modules: BCM, VCU, PMU & T-BOX
The BCM, VCU, PMU and T-BOX that run the electronics on a vehicle, what each one does, and how they talk over the CAN bus.
Read guideSwitches & Sensors: CAN panels, TPMS & HMI
The switches and sensors a driver touches — CAN switch panels, TPMS and rain-light sensors that feed the control modules.
Read guideDisplays & HUD: clusters & CMS mirrors
Instrument clusters, head-up displays and CMS electronic mirrors, and how to match the right screen to a cab.
Read guideBuyer guide index
Browse buyer guides by product family, comparison topic, or vehicle application.
Power Distribution 4 guides
Fuse Box Buyer Guide
Pick the right fuse box for a commercial vehicle — blade or bolt-down, how many circuits, and the ratings that decide it.
Read guideRelay Box vs Fuse Box vs Junction Box
Three boxes people mix up: which one protects the circuits, which switches them, and which just ties them together.
Read guideIP67 Waterproof Distribution Box
What an IP67 rating really covers, and when a sealed distribution box is worth it for wet, exposed chassis mounting.
Read guideExcavator Power Distribution Box
Power distribution built for construction machines that live with constant vibration, dust and heat.
Read guideSmart Control Modules 8 guides
Heavy Truck BCM: what a BCM does
The body control module behind the lights, wipers, doors and signals on a truck, and how it talks to the CAN / J1939 bus.
Read guideVehicle Control Unit (VCU): what a VCU does
The brain that decides torque and energy on an electric or hybrid truck, and why it is not the same part as a BCM or PMU.
Read guidePower Management Unit (PMU): smart power distribution
Why solid-state power distribution is replacing the fuse-and-relay box, and how a PMU shares the work with the BCM and VCU.
Read guideT-BOX Telematics: how a vehicle talks to the fleet office
Send vehicle data, GPS position and service alerts to the fleet office — and see what makes a telematics box fleet-grade.
Read guidePEPS Keyless Entry: passive entry & push-to-start
How passive entry and push-to-start actually work, and whether to add a dedicated PEPS module or build it into the BCM.
Read guidePower Window & Door Control Modules: windows, locks & mirrors
How cab windows, central locking and mirrors are controlled — dedicated module, BCM or switch panel, and how 12 V, 24 V and anti-pinch decide which one to choose.
Read guideVehicle Lighting Control Modules: how exterior lighting is switched
How a lighting control module drives headlamps, turn signals and trailer lighting — dedicated module vs BCM vs combination switch, and how 24 V, trailer-light detection and CAN decide the choice.
Read guideBCM vs VCU vs PMU: what is the difference
Three control modules, side by side: what each one is responsible for, and when a single box can cover more than one job.
Read guideSwitches & Sensors 5 guides
CAN Bus Switch Panel
How a CAN switch panel clears out dashboard wiring, and when LIN or plain hard-wired switches are still the better call.
Read guideHeavy-Truck TPMS
How wheel sensors get tyre pressure to the cab, and what separates valve-stem from clamp-mount mounting.
Read guideBus Stop Request Buttons
How bus stop buttons work, when to choose wired or wireless, and what accessibility details matter before sourcing.
Read guideRain and Light Sensors
How automatic wipers and headlamps work, and when to choose a windscreen light-and-rain sensor over a simpler dash-top sun-load sensor.
Read guidePower-Window & Door Switch Panels
Choosing a LIN cab-door switch panel: 12 V vs 24 V, windows-only vs a full window/lock/mirror master, and direct drive vs a door module.
Read guideDisplays & HUD 4 guides
Commercial Vehicle HUD
Windshield versus combiner head-up displays, where the data comes from, and which one fits a truck or bus cab.
Read guideCommercial Vehicle Instrument Cluster
Digital and hybrid dashboards: what they read off the CAN bus, how they show EV status, and how to choose a format.
Read guideHUD vs Digital Cluster: how to choose
What a digital cluster, a combiner HUD and a windshield HUD each do — and how to tell which one a cab needs, or whether it needs both.
Read guideCommercial Vehicle Mirror Systems
How powered mirror control works, what field-of-view rules require, and where camera monitor systems (electronic mirrors) are starting to replace glass.
Read guideOEM Sourcing & Supplier Pages
For sourcing or OEM quotations, use these supplier pages to see what Youlai builds, what we customize, and how to contact us.
Power Distribution Box Manufacturer
Fuse, relay and junction boxes built to your circuit count, sealing class and connector spec.
Get a quoteHeavy Truck BCM Supplier
Body control modules built to your CAN / J1939 network and electrical load plan.
Get a quoteCAN Bus Switch Panel OEM Manufacturer
Multiplexed switch panels and keypads built to your key layout and CAN bus design.
Get a quoteCommercial Vehicle Sensor Manufacturer
TPMS, rain-light and fuel-level sensors built to your vehicle type, wheel layout and mounting points.
Get a quoteDisplay & HUD Manufacturer
Instrument clusters, CAN displays and head-up displays built to your CAN spec and bracket drawings.
Get a quoteTalk to Our OEM Project Team
Reply within 24 hours (UTC+8). Send drawings or specifications via WhatsApp or email.