Understanding the BL-ST-052 Sensor and FRIDAY Compatibility
The BL-ST-052 (branded BH-Sens, manufactured by Baolong Technology) is a pre-programmed, clamp-in TPMS sensor operating at 433MHz. It is designed to replace original equipment sensors for FRIDAY vehicles that carry Forthing TPMS systems. The sensor covers 16 specific vehicle applications where the factory sensor carries one of three OE numbers: CM5B3685020, CM5B3685020S, or SX5G3685020B.
Before you purchase, understand that “compatible” doesn’t mean universal. This sensor works only on FRIDAY models that were originally equipped with Forthing TPMS hardware. If your vehicle uses a different TPMS brand or frequency (such as 315MHz), this sensor will not communicate with your ECU.
How to Verify Fitment Before Buying
Step 1: Locate the OE Part Number on Your Current Sensor
Remove the tire and valve stem assembly. The OE number is stamped directly on the metal housing of the TPMS sensor. Look for a string like CM5B3685020, CM5B3685020S, or SX5G3685020B. If the number matches one of these, the BL-ST-052 is a direct replacement.
Step 2: Confirm the Frequency
Most FRIDAY vehicles with Forthing TPMS operate at 433MHz. However, some late-model or regional variants may use 315MHz. Check your owner’s manual or use a TPMS diagnostic tool to read the sensor ID and frequency. If your tool shows 433MHz, you’re good.
Step 3: Check Vehicle Year Range
The 16 OE applications cover FRIDAY models from approximately 2015 through 2023. Exact year coverage depends on the specific model and market. Below is the general fitment table:
| FRIDAY Model | Years Covered | OE Numbers Verified |
|---|---|---|
| Forthing S500 | 2015–2022 | CM5B3685020S |
| Forthing T5 | 2017–2023 | CM5B3685020 |
| Forthing X5 | 2016–2021 | SX5G3685020B |
| Forthing F300 | 2018–2023 | CM5B3685020 |
| Forthing M7 | 2019–2022 | CM5B3685020S |
Note: This table is representative. Some FRIDAY models may share the same TPMS platform. Always verify by physical inspection.
Step 4: Use a TPMS Scan Tool
A TPMS diagnostic tool (like an Autel or Bartec) can read the sensor ID and confirm compatibility. Program the BL-ST-052 to the vehicle using the tool’s “program by OE” function. Because the sensor is pre-programmed, no additional cloning is needed for most FRIDAY models.
Installation Tips for the BL-ST-052
- Torque the valve stem to the manufacturer’s specification (typically 4.5–5.5 Nm). Overtightening can damage the sensor.
- Use a new metal valve cap and replace the rubber grommet if included.
- After installation, drive the vehicle for 5–10 minutes at speeds above 25 km/h to allow the sensor to auto-learn.
- If the TPMS light remains on, perform a sensor ID reset using a diagnostic tool or follow the vehicle’s relearn procedure (typically a specific sequence of ignition cycles and tire pressure adjustments).
Why Pre-Programmed Sensors Save Time
Unlike blank sensors that require programming with a tool, the BL-ST-052 arrives pre-programmed with the most common Forthing IDs. For most FRIDAY vehicles, you can install it directly and the system will recognize it. In rare cases where the vehicle uses a unique ID, you may need a TPMS tool to assign the sensor to a specific wheel position.
Recommended Part
For FRIDAY vehicle owners needing a reliable replacement for Forthing TPMS sensors, the BL-ST-052 | BH-Sens 433MHz TPMS Tire Pressure Sensor | Fits Forthing | OE# CM5B3685020, CM5B3685020S, SX5G3685020B offers a direct OE fit with no programming required for 16 dedicated applications. It matches the factory specs of Baolong Technology sensors used in these models.
FAQ
How do I know if my FRIDAY vehicle uses 433MHz or 315MHz TPMS?
Check the frequency printed on the current sensor housing, or use a TPMS diagnostic tool. Most FRIDAY Forthing models from 2015 onward use 433MHz, but early-production vehicles before 2017 may differ. If you cannot find the frequency, contact a dealer with your VIN.
Can I use the BL-ST-052 on a FRIDAY model not listed in the fitment table?
Only if the vehicle’s TPMS system uses one of the three OE numbers (CM5B3685020, CM5B3685020S, or SX5G3685020B). If your sensor shows a different number, the BL-ST-052 is not compatible. Cross-referencing with a TPMS database is recommended.
Do I need to reprogram the sensor after installation?
In most cases, no. The BL-ST-052 is pre-programmed and will auto-learn with FRIDAY’s Forthing TPMS system. However, if the sensor does not communicate after driving, use a TPMS tool to assign it to the correct wheel position.
What is the lifespan of this TPMS sensor?
The internal battery is rated for 5–7 years under normal driving conditions. Replacement is recommended when the battery voltage drops below 2.6V, which you can check with a diagnostic tool.