Understanding TPMS Relearn on the EADO ET
The EADO ET, a compact sedan produced by Changan Automobile, comes factory-equipped with direct TPMS sensors from Baolong Technology (BH-Sens). These sensors transmit real-time tire pressure data to the vehicle’s ECU. When you replace a faulty sensor or rotate tires, the ECU loses the sensor ID mapping and needs a “relearn” to re-associate each sensor with its wheel position.
This is not optional—skipping the relearn will trigger a persistent TPMS warning light on your dashboard, and the system will not display correct tire pressures.
Three Relearn Methods for the EADO ET
| Method | Tools Needed | Time | Best For |
|---|---|---|---|
| Auto Relearn | None (just driving) | 10-15 minutes | Post-tire rotation with same sensors |
| OBD Relearn | TPMS diagnostic tool (e.g., Autel, BH-Sens programmer) | 1-2 minutes | Sensor replacement or quick reset |
| Stationary Relearn | TPMS trigger tool (magnetic or LF) | 5-10 minutes | When OBD tool is unavailable |
1. Auto Relearn (Drive-Based)
The EADO ET supports a “self-learning” mode that activates when you drive under specific conditions. This method is suitable only if you are rotating tires with the original, working sensors.
Step-by-step:
- Inflate all tires to the recommended pressure (typically 32-35 psi, check your driver-side door jamb sticker).
- Start the engine and drive the vehicle above 25 mph (40 km/h) continuously for 10-15 minutes.
- The TPMS control module will automatically detect each sensor’s signal and map it to the wheel position.
- The TPMS warning light should turn off after a successful relearn. If it remains on, repeat the process or switch to OBD relearn.
Limitations: This method only works if the sensors are already paired with the vehicle. It will not recognize a brand-new sensor with a different ID. Also, stop-and-go city traffic may prevent the system from completing the relearn—open highway driving is ideal.
2. OBD Relearn (Recommended for Sensor Replacement)
This is the fastest and most reliable method. When you replace a sensor with a pre-programmed unit like the BL-ST-040 | BH-Sens 433MHz TPMS Tire Pressure Sensor | Fits Bestune, FAW, Hongqi | OE# 3602100FD, 3602100FDA, 3778080DB01A, the OBD tool writes the new sensor ID directly into the ECU.
Required Tool: A TPMS diagnostic tool compatible with Changan/Bestune/FAW protocols. The Autel TS508, TS608, or the BH-Sens TPMS Programmer (part of the BL-ST-040 kit) work well.
Step-by-step:
- Connect the OBD tool to the vehicle’s diagnostic port (located under the driver’s side dashboard, near the hood release).
- Turn the ignition to the ON position (engine off).
- Select “EADO ET” or “Changan EADO” from the vehicle menu. If not listed, try “Bestune” or “FAW” as they share the same TPMS platform.
- Choose the relearn function. The tool will prompt you to activate each sensor.
- Follow the on-screen instructions—typically, you will place the tool’s LF antenna near each tire’s valve stem and press “Activate.”
- After all four sensors are activated, the tool writes the IDs to the ECU.
- Verify: The tool should display “Relearn Successful.” Start the engine—the TPMS light should be off.
Note: The BL-ST-040 sensor is pre-programmed with a compatible ID, so you do not need to program it first. Just install the sensor, then perform the OBD relearn.
3. Stationary Relearn (Magnetic Trigger Tool)
This method is useful if you own a generic TPMS trigger tool (like the ATEQ VT60 or a simple magnet-based activator). It works by triggering each sensor in a specific sequence.
Step-by-step:
- Park the vehicle on a level surface. Turn the ignition ON (engine off).
- Locate the TPMS reset button. On the EADO ET, this is usually behind a small cover on the lower dashboard, near the steering column. If you cannot find it, check the owner’s manual—some models use a combination of hazard light and brake pedal presses to enter relearn mode.
- Enter relearn mode: Press and hold the reset button for 3-5 seconds until the horn beeps twice or the TPMS light starts flashing.
- Starting with the front-left tire, place the trigger tool against the tire sidewall near the valve stem. Press the trigger button for 2-3 seconds. The horn should beep once to confirm.
- Repeat for front-right, then rear-right, then rear-left. Each successful trigger will produce a beep.
- After the last tire (rear-left), the horn will beep twice, and the TPMS light will turn off. The relearn is complete.
- If the horn does not beep, check that the sensor is within range (within 6 inches of the valve stem) and that the battery is fresh.
Important: The order is critical. If you trigger the wrong wheel first, you may need to start over.
When to Replace the TPMS Sensor
The factory BH-Sens sensors in the EADO ET have a battery life of approximately 5-7 years. If your TPMS light stays on after a relearn, or if the pressure readings show “—” on the display, the sensor battery is likely dead. Replace it with a compatible unit.
The BL-ST-040 | BH-Sens 433MHz TPMS Tire Pressure Sensor | Fits Bestune, FAW, Hongqi | OE# 3602100FD, 3602100FDA, 3778080DB01A is a direct replacement for the EADO ET, using the same Baolong technology. It comes pre-programmed with OE IDs (3602100FD, 3602100FDA, 3778080DB01A), so no additional programming is needed—just install and perform an OBD relearn.
Common Mistakes to Avoid
- Skipping the relearn after sensor replacement: The light will remain on even with a new sensor.
- Using the wrong relearn method: Auto relearn will not work with a new sensor ID.
- Not verifying pressure: Always check tire pressure before starting a relearn. Under-inflated tires can cause false failures.
- Ignoring the order: Stationary relearn requires a specific wheel sequence—check your manual.
Recommended Part
For a hassle-free replacement, use the BL-ST-040 | BH-Sens 433MHz TPMS Tire Pressure Sensor | Fits Bestune, FAW, Hongqi | OE# 3602100FD, 3602100FDA, 3778080DB01A. It is a clamp-in, 433MHz sensor that fits Bestune, FAW, and Hongqi models as well. The pre-programmed design saves you the step of cloning IDs, and the OBD relearn takes less than two minutes with a compatible tool.
FAQ
How do I know if my EADO ET needs a TPMS relearn?
If the TPMS warning light stays on after you have inflated the tires to the correct pressure, or if you see “—” or “0” displayed for any tire pressure, a relearn is required. This also applies after tire rotation or sensor replacement.
Can I drive with the TPMS light on after replacing a sensor?
Yes, but the system will not show accurate tire pressure readings. The light may cause a failed inspection in some regions. More importantly, you lose the safety benefit of real-time pressure monitoring. Perform the relearn as soon as possible.
What OBD tool works best for the EADO ET?
The Autel TS508 or TS608 are reliable and widely available. The BH-Sens dedicated programmer (often bundled with the BL-ST-040 sensor) is also a good choice because it is pre-loaded with the correct protocols for Changan and FAW vehicles.
How long does the battery last in the BL-ST-040 sensor?
The BH-Sens BL-ST-040 sensor battery typically lasts 5-7 years under normal driving conditions. The sensor is sealed and must be replaced as a unit when the battery dies.