Win Additional NCAP Points Around the World with Rear Seat SBR

 In Blog, Safety

Need for audio visual seat belt reminder for rear seats

In India, according to Central Motor Vehicle Rules Section 125 1(A), every M1 category motor vehicle must be equipped with passenger seat belts for front seats & front facing rear seats. As per Rule 381(3), a person sitting in front seat or front facing rear seat must wear seat belt when the vehicle is in motion. Unfortunately, a majority of the passengers still do not follow the rules. Studies reveal that occupants are much more likely to wear their belts in cars equipped with a Seat Belt Reminder (SBR) system than in those without. The audio-visual seat belt reminders have a high efficacy rate, reducing the number of unbelted occupants by 80%. Since July 2019, India mandated the use of Seat Belt Reminder system for driver and co-driver seats.

While more & more people seated in the front row, have now started wearing seatbelts, only a very small fraction of people (4%) wear seatbelts in the rear seats in our country.

Simple and efficient method from IEE to motivate occupants to buckle up

IEE has been developing and manufacturing innovative and cutting-edge automotive sensing solutions for more than 25 years. IEE is a global leader in Occupant Detection Sensing for Seat-Belt Reminder systems, working closely with car makers around the world. Over 200 million vehicles worldwide have been equipped with IEE Seat Belt Reminder Sensors.

Let’s see how this system works:

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1. A seat belt reminder sensor detects occupants in front and rear seats.

2. A seat belt buckle switch notices whether the seat belt is buckled up or not.

3. The control unit of the airbag/SBR-system monitors the Seat Belt Reminder sensor and seat belt buckle switch.

4. The control unit concludes, if the seat is occupied by an unbuckled occupant and triggers an audible chime and an optical warning, if needed.

And thus, unbuckled occupants are reminded to fasten seat belts.

Features and Benefits of IEE’s Front and Rear Seat Belt Reminder Sensors

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  1. Made up of two carrier sheets of 0.4 mm thickness, these sheets are glued together by spacer adhesives.
  2. The electrical resistance of the printed force sensing cell drops, when pressure is applied. This difference in the resistance value is the signal for the SBR system that the seat is occupied.
  3. The sheets provide high design flexibility for easy integration into either the A or B surface of the seats.
  4. The SBR sensor mat is available in various layouts reliably detecting adult occupants.
  5. IEE SBR mats are designed to make the development cycles short and replacement procedures simple, nullifying the needs for calibrations or re-calibrations during the entire lifetime making it cost effective.
  6. They are not affected by seat adjustments, re-positioning or vibrations and shocks and provide robust sensor performance without any effects of temperature or humidity.

Rear Seat SBR – Incentives by various NCAPs

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NCAPs worldwide assess the safety of vehicles. As the safety rating is only applicable to belted occupants, various NCAPs have decided to award additional points to advanced rear seat SBR systems, capable to trigger audio-visual warnings:

  • Japan NCAP – 2011
  • Euro NCAP & Australia NCAP – 2018
  • ASEAN NCAP – 2021
  • Installation rates for rear seat SBR sensors in Euro NCAP tested vehicles went up from 38% in 2018 to 46% in 2019.


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