Overview
The EBX-954 is a 24 V pure-logic body control module designed for heavy-truck, commercial-vehicle and construction-machinery platforms that need a high-density I/O bank in a compact sealed envelope, without the integrated fuse/relay carrier of a larger central distribution box. Where the EBX-953 combines BCM logic with an internal fuse/relay carrier in one box, the EBX-954 is the right tier when the program already has a dedicated power distribution box on the harness and just needs the body-logic ECU.
Electrically the module operates across an 18–32 VDC range with quiescent current ≤ 1 mA (low standby draw suitable for vehicles that park for extended periods). Four-layer hardware protection (over-voltage / over-current / short-circuit / over-temperature) covers each output channel. The communication backbone is three CAN buses plus one LIN bus, with on-board ISO 15765 diagnostics. A reserved RF receive-antenna port is provisioned on the housing for RKE / remote-keyless programs where the customer asks for it.
The reserved RF port makes the EBX-954 RKE-ready, but the module is a body-logic BCM and does not carry a passive-entry / passive-start stack on board. On a 24 V programme that wants full keyless entry and push-to-start, the EBX-954 keeps the body logic while a dedicated EBX-964 PEPS controller owns the LF antennas, the fob authentication and the start sequencer — see the PEPS keyless entry guide for the integrated-versus-dedicated decision. If you are still deciding between a BCM, a VCU and a PMU for the platform, the BCM vs VCU vs PMU comparison sets the three side by side.
Integrated functions
The EBX-954 covers the body-control functions that a heavy commercial vehicle typically spreads across a BCM plus several discrete controllers:
- Vehicle lighting. Headlamp / position lamp / fog lamp / turn signal / brake lamp / reverse lamp / horn drive and feedback.
- Cab comfort & HVAC. Air-conditioning control (compressor / blower interlocks), wiper drive (intermittent / low / high), washer pumps, mirror folding and mirror heating drive.
- Ignition & powertrain interlocks. Ignition-lock signal, start-up control, gear-position monitoring, ECU control interlocks — safe sequencing of start / accessory / run states.
- Central locking & doors / windows. Door lock / unlock drive (electric central locking), door open / close signal acquisition, electric-window drive on the LIN sub-network.
- After-treatment. Reserved driver channels for after-treatment heater / delay-off control branches on modern emission-equipped diesel programs.
- Vehicle network & diagnostics. 3 CAN buses for inter-controller communication and body-builder integration; 1 LIN bus typically allocated to the electric-window or smart-switch sub-network; on-board ISO 15765 diagnostics service.
Engineering details
The EBX-954 occupies a 193.6 × 157.8 mm footprint with a 33.6 mm overall height (including connector profiles), with M9 mounting bushings on four sides and a PC200 upper / lower housing wrapping an FR-4 PCBA. The connector field is six sealed harness positions distributed across all four edges of the housing — A on the bottom, B on the bottom-right, C on the top-right, D on the bottom-left, E on the side, F on the top — giving the harness designer room to land the inputs on one side and the high-current outputs on the other.
- Four-layer hardware protection on every output: over-voltage cut, over-current limit, short-circuit cut-off and over-temperature de-rating, in line with commercial-vehicle BCM-side protection practice
- 3 CAN buses plus 1 LIN — protocol confirmed per program (J1939 family commonly used on commercial-vehicle networks); LIN typically allocated to the electric-window or smart-switch sub-network
- ISO 15765 on-board diagnostics for end-of-line bench testing and field service tooling
- Input bank: 67 channels with per-channel digital/analog and high/low active level configuration — one of the densest input banks in the EBX BCM range, suitable for programs with many switch and sensor signals
- Output bank: 26 high-side outputs + 19 low-side outputs = 45 driver channels for body actuators (lamps, locks, windows, mirrors, fans, after-treatment heaters)
- Reserved RF receive-antenna port for RKE / remote-keyless add-on; specific RF front-end confirmed per program (e.g. 315 MHz / 433 MHz family)
- IP54 sealing (dust-protected, splash-protected) suitable for cab-mounted installation; specify a sealed-connector variant at quotation if the program requires chassis-mounted IP67
Mechanical layout & connector field
Mating connectors
Current-production EBX-954 housings include 6 OEM-grade automotive connectors, all from the AMP / Tyco family. The reference P/N below documents the connectors on the current production build; the matching wire-side seals, terminal P/N and harness colour code are confirmed against the customer harness drawing at quotation.
| ID | Reference P/N | Brand |
|---|---|---|
| A | 1318389-1 | AMP / Tyco |
| B | 1318917-1 | AMP / Tyco |
| C | 936095-1 | AMP / Tyco |
| D | 936151-1 | AMP / Tyco |
| E | 8-968973-1 | AMP / Tyco |
| F | 936098-1 | AMP / Tyco |
Construction
Comparison with other Youlai BCM modules
The EBX BCM family covers two main voltage classes (12 V and 24 V) and two architectural patterns (pure-logic BCM vs. integrated fuse/relay BCM):
| Model | System | Pattern | I/O density | Footprint |
|---|---|---|---|---|
| EBX-954 | 24 V (18–32 VDC) | Pure-logic BCM + RKE-ready | 67 in · 45 out | 193.6 × 157.8 mm |
| EBX-953 | 24 V (18–32 VDC) | Integrated fuse/relay BCM | ~110 I/O + 48 protected outputs | 285.8 × 159.8 mm |
| EBX-2305 | 12 V (9–16 VDC) | Pure-logic BCM + integrated RF | ~120 I/O across J1/J2/J3 | Compact, new-energy class |
| EBX-2313 | Light truck class | Pure-logic BCM (no integrated fuse/relay) | ~100 I/O across 5 connectors | 138 × 170 mm |
The EBX-954 is the right choice when a 24 V program needs a high-density input bank and RKE-ready provisioning, without the integrated fuse/relay carrier. Pair it with one of the NBX central distribution boxes on the harness if the program also needs centralised fuse / relay routing — or step up to the EBX-953 if BCM logic and fuse/relay carrier should live in one box.
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, ISO 15765 diagnostics service, quiescent current, the lighting / locking / window / wiper / mirror I/O matrix and (when fitted) the RF receive channel 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-954 belongs to the Smart Control Modules family. To request the harness drawing, the I/O channel map or a PPAP package, please use the contact page with your target vehicle programme, expected annual volume and key technical requirements (target voltage class, CAN protocol family, IP rating, working temperature, RKE option Yes/No, connector preference). Drawings welcome.
