Japan’s Ministry of Internal Affairs and Communications (MIC) has officially enacted new regulations concerning the use of the 433 MHz band for Tire Pressure Monitoring Systems (TPMS) and Remote Keyless Entry (RKE) systems. The changes, published as Ordinance No. 5 on February 27, 2025, mark a significant milestone following last year’s public consultation on the topic.
Background: Public Consultation and Draft Proposal
In September 2024, MIC opened a public comment period for the proposed technical conditions governing low-power devices in the 433 MHz band. This initiative, led by the Land Wireless Communications Committee, aimed to update and align Japan’s standards with international practices—particularly in automotive applications. Stakeholders were invited to share feedback between September 7 and October 7, 2024.
The draft outlined specific frequency ranges and technical specifications to ensure safe, interference-free operation of TPMS and RKE systems—technologies increasingly critical to vehicle safety and convenience.
Expansion from 315 MHz to 433 MHz
Until now, only the 315 MHz band was permitted for TPMS and RKE applications in Japan. However, with this ordinance, Japan has officially opened the 433 MHz band for use, bringing the country in line with global practices and offering manufacturers greater flexibility in product design and regional harmonization.
With the regulatory foundation now in place, applications for MIC certification are expected to open within the next few weeks. Manufacturers intending to market 433 MHz TPMS or RKE systems in Japan should begin preparing technical documentation and test plans in anticipation.
If you would like more information on Japan MIC regulations and approval requirements, please contact iCertifi.