Overview
The EBX-957 is the EBX family's dedicated 24 V TPMS receiver — the unit that sits at the centre of the vehicle's tyre-pressure monitoring loop, demodulates the wheel-side sensor bursts and pushes the per-wheel measurements onto the vehicle CAN bus. The architecture is intentionally simple: wheel-side sensors (valve-stem or clamp-mount style) sample pressure / temperature / acceleration on the tyre side and transmit short RF bursts at 433.92 MHz; the central EBX-957 receiver demodulates the bursts, runs the frequency-hopping receive algorithm to filter out neighbouring vehicles' transmissions, and reports the recovered per-wheel data over a single CAN channel to whatever consumer wants it (cluster, BCM, telematics, fleet back-end).
The compact 62 × 60.3 mm sealed body lands on a single Deutsch DT06-4S sealed 4-pin connector — one mounting bracket, one connector, one CAN bus to integrate. The IP67 sealing class plus the fully-potted construction make it suitable for in-cab placement near the rear of the cab, behind the dashboard, or under-chassis with a sealed harness routing.
System architecture
A complete TPMS system based on the EBX-957 has two halves: the wheel-side sensor population and the cab-side receiver. Both halves are needed; we supply the matching wheel-side sensors as separate line items.
Wheel-side sensors (sold separately, two styles supported)
The EBX-957 is compatible with two wheel-side sensor styles, both on the same receiver firmware:
- Valve-stem TPMS sensor — mounted directly on the valve stem of the wheel, inside the tyre cavity. Measures the true tyre-cavity pressure / temperature, requires the tyre to be dismounted for sensor service.
- Clamp-mount TPMS sensor — clamps to a chosen point inside the rim or wheel-well, with an external whip antenna routed into the cavity. For wheels whose geometry does not accept a valve-stem sensor — non-standard mining rims, special trailer wheels and drop-centre wheels — so a fleet with mixed wheel populations can run one TPMS protocol across both rim families.
Both styles transmit the same payload (pressure + acceleration + temperature) on the same 433.92 MHz frequency-hopping band, with pairing IDs that the EBX-957 receiver learns at programme commissioning.
Cab-side receiver (EBX-957)
The receiver runs a frequency-hopping demodulator on the 433.92 MHz ± 0.5 MHz band (the ±0.5 MHz spread covers the sensor population's hopping schedule plus the OEM-paired hopping mask). The demodulated payloads are deduplicated against the paired sensor IDs and pushed onto the single CAN reporting channel as per-wheel pressure / acceleration / temperature messages. The cluster / BCM / telematics consumer subscribes to the CAN messages and surfaces the per-wheel state to the driver or to the back-end.
Engineering details
The EBX-957 is one of the smallest modules in the EBX family — a 62 × 60.3 × 29.4 mm sealed body (47 mm housing body width over the connector face, 62 mm over the two side mounting ears with two Φ7 mm through-holes). The single Deutsch DT06-4S connector face dominates the top side of the housing.
- Frequency-hopping RF receive on the 433.92 MHz ± 0.5 MHz band — the ±0.5 MHz spread plus the FHSS pattern filter out neighbouring vehicles' TPMS transmissions, so a fleet of trucks parked in the same yard does not cross-talk
- Three-parameter recovery per wheel: pressure / acceleration (rotation / motion-state detect) / temperature — recovered from each wheel-side sensor payload
- Compatible with both valve-stem and clamp-mount sensors — the same receiver firmware supports both styles, so the fleet can mix styles across wheels or migrate from one style to the other without changing the receiver SKU
- Single CAN reporting channel — one CAN bus carries all per-wheel measurements upwards to the cluster / BCM / telematics consumer; CAN message catalogue is per programme
- Deutsch DT06-4S sealed connector — standard automotive part (industry-wide availability for the mating wire-side housing, terminals and seals); pin allocation is power / ground / CAN_L / CAN_H
- Fully potted construction — ABS+PC upper and lower housings, FR-4 PCBA in between, fully potted with AB epoxy compound — vibration-immune to the typical commercial-vehicle vibration profile, moisture-immune through the housing seam
- IP67 dust-tight + immersion-protected sealing class — suitable for in-cab placement behind the dashboard, in the cabin rear, or under-chassis with a sealed harness routing
Mechanical layout
Construction & companion wheel sensors
Connector pin-out reference
| Pin | Function | Signal type |
|---|---|---|
| 1 | Power supply (+24 V) | Power |
| 2 | Ground | Power return |
| 3 | CAN_L | CAN bus (low) |
| 4 | CAN_H | CAN bus (high) |
Comparison with other Youlai TPMS / sensor modules
| Model | Role | Mount | Output | Notes |
|---|---|---|---|---|
| EBX-957 | TPMS receiver (central) | In-cab / cabin / under-chassis | 1 × CAN reporting | 433.92 MHz FHSS / IP67 / DT06-4S |
| YDK-902 | TPMS sensor (wheel-side) | Valve-stem (heavy-truck, inside tyre) | RF 433.92 MHz burst | Pairs with EBX-957 |
| YDK-903 | TPMS sensor (wheel-side) | Clamp-mount with external whip antenna (non-standard rim) | RF 433.92 MHz burst | Pairs with EBX-957 |
The EBX-957 is the central receiver. The wheel-side sensors (valve-stem or clamp-mount style) are separate line items — for the heavy-truck wheel-side sensors pre-paired to the EBX-957 system, see the YDK-902 valve-stem TPMS sensor and the YDK-903 clamp-mount TPMS sensor. A complete TPMS deployment needs one EBX-957 receiver plus one wheel-side sensor per wheel position (typical 6 for a 4×2 tractor, 18 for a 6×4 + tri-axle trailer combination, programme-specific).
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 — the 433.92 MHz receive sensitivity, the frequency-hopping demodulator capture range, the CAN bus health, the quiescent current under all sleep / receive states, and the Deutsch DT06-4S harness-side mating are all checked. The IP67 sealing class is validated per our IP-rating test procedure; EMC pre-compliance screening in our in-house lab follows the OEM EMC profile.
How to ask
The EBX-957 belongs to the Smart Control Modules family. To request the harness drawing, the CAN message catalogue, the sensor-pairing toolchain, the wheel-side sensor selection (valve-stem vs clamp-mount) or a PPAP package, please use the contact page with your target vehicle programme, expected annual volume and key technical requirements (number of wheel positions, sensor style preference, fleet management back-end protocol, mounting position for the central receiver). Drawings welcome.
