SYMPTOM/CONDITION
The TPMS(Tire Pressure Monitoring System) malfunction indicator lamp may be illuminated if the vehicle is moving around electric power supply cables or radio transmitters at police stations, government and public offices, broadcasting stations, military installations, airports, transmitting towers, etc. External electronic devices connected to the vehicle's power outlets (notebook computer, seat warmer, massager, coolers, GPS navigation, mobile phone charger, etc.) may also cause this condition. The TPMS malfunction indicator lamp generally turns off after the vehicle is removed from such interferences.

DIAGNOSIS:
If the TPMS indicator lamp is ON, and all four wheel sensors are checked and are working correctly, external electronic devices connected to the vehicle's power outlets (notebook computer, seat warmer, massager, coolers, etc.) may be the cause of this condition. Car manufacturers are aware that any aftermarket device operating especially on the CAN-Bus system can trigger random warning lamps.

ACTION:
1. Please inspect if there are any other electronic devices inside the vehicle that may cause electromagnetic interferences with the TPMS.
2. Drive the vehicle out of the strong electric field for about 5 minutes to verify that the condition is corrected.
3. Relocate the Control Box and its related cables away from the TPMS sensor (typically located behind the glove compartment).
4. If the above doesn’t work, use a metallic shield wrap or a similar material to wrap around the Control Box and its cables with both ends of the shield connected to chassis ground at the point of entry.