EBX-953 Commercial-Vehicle Body Control Module

Overview

The EBX-953 is a 24 V body control module engineered for heavy-truck, bus / coach, construction-machinery and commercial-vehicle platforms that need both a body-control logic core and the downstream fuse / relay carrier in one sealed unit. Where a typical BCM stops at logic-level outputs and hands current routing back to an external power distribution box, the EBX-953 integrates the relay drivers, the 24-volt main relays and a 37-position mini-blade fuse bank onto the same PCBA assembly. The result is one ECU on the harness instead of one BCM plus one PDB — fewer connectors, less inter-box wiring, simpler diagnostics.

Electrically the module operates across an 18–32 VDC range with quiescent current ≤ 5 mA. Four-layer hardware protection (over-voltage / over-current / short-circuit / over-temperature) covers each output channel. The communication backbone is three CAN buses (a PCAN powertrain / chassis bus, an ICAN inter-controller bus and a dedicated upper-vehicle CAN for body-builder / aftermarket integration) plus one LIN bus typically allocated to the electric-window sub-network.

Integrated functions

The EBX-953 consolidates the body-control functions that a heavy commercial vehicle typically spreads across a BCM plus several discrete controllers:

• Ignition & power management. ON-fire control and ECU ON-fire control, ACC control, ignition-lock control, electrical power management for downstream subsystems.
• Lighting. Headlamp / position lamp / fog lamp / turn signal / brake lamp / reverse lamp drive and feedback, plus body-builder reserved channels.
• Wiper & HVAC. Front and rear wiper drive (intermittent / low / high), washer pumps, fan control, HVAC compressor / blower interlocks, pre-heat control.
• Central locking & electric windows. Door lock / unlock drive, horn drive, 4-door electric window up / down outputs with reserved positions for rear-right and rear-left windows.
• Drivetrain & aftermarket. Gear-position monitoring, radio / cluster interlocks, engine fault feedback, seat-belt warning, sensor signal acquisition (analog + frequency).
• Vehicle network. Three CAN buses (PCAN / ICAN / upper-vehicle CAN) for inter-controller communication and body-builder integration; one LIN bus typically dedicated to electric-window sub-network communication.

Engineering details

The EBX-953 occupies a 285.8 × 159.8 mm footprint with a 67.2 mm overall height (including connector profiles), an M8 stud at each of the four corners and a PA + PPO upper / lower housing with an aluminium heat-spreader plate above the PCBA. The internal carrier holds 5 main relays (ON relay, alternator-excitation relay, ACC relay, whole-vehicle central-signal relay, upper-vehicle / body-builder power relay), ~37 mini-blade fuses on the central bus, plus slow-blow main-feed fuses on the high-current branches.

• Four-layer per-output protection — over-voltage cut-off, over-current limiting, short-circuit isolation and over-temperature de-rating — covering both the logic-side drivers and the integrated fuse/relay carrier outputs
• 3 CAN buses (PCAN powertrain / chassis · ICAN inter-controller · upper-vehicle CAN body-builder) — protocol confirmed per program (J1939 family commonly used on commercial-vehicle networks)
• 1 LIN bus — typically allocated to the electric-window sub-network on the standard build; alternative allocations available per program
• I/O density: 11 power/ground hard inputs, 46 digital inputs, 9 analog inputs, 2 pulse/frequency inputs against 43 high-side + 3 low-side outputs and 48 fuse/relay-protected power outputs — one of the higher I/O densities in the EBX BCM range
• IP53 sealing (dust-protected, spray-protected) suitable for cab-mounted installation; specify a sealed-connector variant at quotation if the program requires chassis-mounted IP67

Mechanical layout & internal carrier

Mating connectors

Current-production EBX-953 housings include 9 OEM-grade automotive connectors from Tyco/AMP and KET. The reference P/N below documents the connectors on the current production build; the matching wire-side housing, terminal P/N and harness colour code are confirmed against the customer harness drawing at quotation.

Construction & bill of materials

Comparison with other Youlai BCM modules

The EBX-953 is the 24 V integrated-carrier member of the BCM range. The table below sets it against the pure-logic siblings and the 12 V class, so a programme can land on the right voltage and the right architecture — one-box (logic + fuse/relay) or logic-only with a separate distribution box:

The EBX-953 is the right choice when a 24 V program wants one box on the harness instead of a separate BCM plus PDB. For a 24 V program that keeps the BCM logic pure and routes fuse / relay through a separate NBX box, the EBX-954 is the closer match. For a 12 V new-energy program with RKE / PKE smart-key requirements, the EBX-2305 is the closer match. For a light-truck BCM with pure logic and no integrated fuse/relay (12 V or 24 V per programme), the EBX-2313 is the right tier. One-box or two is a programme-architecture decision before it is a model decision, and the heavy-truck BCM guide works through the body-function scope that drives it.

Manufacturing & testing

Built under IATF 16949 with APQP project planning and a PPAP package available for OEM programmes. Every unit is end-of-line functional-tested before packaging — CAN/LIN bus health, current draw, the lighting / locking / window / wiper I/O matrix and each integrated fuse / relay position are all checked. Environmental validation and EMC pre-compliance screening in our in-house lab is run when the programme requires it.

How to ask

The EBX-953 belongs to the Smart Control Modules family. To request the harness drawing, the per-position fuse / relay map or a PPAP package, use the contact page. These help if you already have them: target vehicle programme, expected annual volume and key technical requirements (target voltage class, CAN protocol family, IP rating, working temperature, connector preference). Drawings welcome.