Proposal to align UN R121 with ISO 2575 per ISO Resolution 664 allowing for use of the diesel engine glow plug symbol with non-diesel technologies that (also) assist engine starting at low temperatures. he current text of the Regulation focuses on diesel engine glow plugs that assist in starting the engine at low temperatures.

At its fifty-ninth session, GRSP approved a proposal for the 07 series of amendments to UN R16 ( (GRSP/2016/2 and GRSP/59, page 24) to mandate safety belt reminders for all vehicle seats. This proposal aligns provisions in UN R121 with the changes to UN R16:
a) the term “seat belt” is replaced by “safety belt”,
b) the symbol for safety belt, defined in item 21 of Table 1 in the Regulation, may be displayed in different colours to convey different meanings. Therefore, the existing footnote ¹⁸ has been added to item 21, and
c) this symbol may be replaced by different symbols for seats other than those of the front row. Therefore, a new footnote ²² is added to item 21.

Paragraph 5.1.5. is modified and paragraph 5.1.7. introduced to take into consideration the strict content of GRSP/59, page 24, paragraphs 8.4.3.2.1. and 8.4.4. on safety-belt reminder for occupants of rear seat row(s). This proposal does not change any of the technical requirements of UN R121.