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UN R121 Supplement 7 (01 series) · UNECE Regulation No. 121 (ECE R121) — Uniform provisions concerning the approval of vehicles with regard to the location and identification of hand controls, tell-tales and indicators.

UN R121 — Supplement 7 to the 01 series of amendments

Supplement 6 → 7

Adopted at the WP.29 197th sessionEntry into force 2026-06-04
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What changed
  • Paragraphs 5.2.1., 5.2.2., 5.2.3., 5.2.6., 5.4.1.1. and 5.4.2. now refer to ISO 2575:2021 instead of ISO 2575:2004.
  • Footnotes 2 and 18 of Table 1 now also refer to ISO 2575:2021.
Why
  • According to the GRSG report, GRSG-129-15 updates the ISO standard by taking into account new features and associated symbols.

Q1What changed8 changes

Reference to ISO 2575:2021 (paras. 5.2.1., 5.2.2., 5.2.3., 5.2.6., 5.4.1.1. and 5.4.2., Table 1 footnotes 2 and 18)

Paragraphs 5.2.1., 5.2.2., 5.2.3., 5.2.6., 5.4.1.1. and 5.4.2. now refer to ISO 2575:2021 instead of ISO 2575:2004. Footnotes 2 and 18 of Table 1 now also refer to ISO 2575:2021. Apart from the edition of ISO 2575, the wording of these paragraphs and footnotes is the same as before.

Where fitted, the controls, tell-tales and indicators, listed under the heading column 3 of Table 1, shall be identified by symbols designated for them in column 2 of Table 1. This requirement does not apply to the horn (an audible warning signal) control, when it is activated by a narrow ring-type control or by a lanyard. If a symbol is used for identifying a control, tell-tale or indicator not listed in Table 1, it is recommended to use a symbol designated for the purpose in standard ISO 2575:2004 2575:2021 where one exists and where that symbol is suitable for the application concerned.
To identify a control, a tell-tale or an indicator not included in Table 1 or ISO 2575:20042575:2021, the manufacturer may use a symbol of its own conception. Such symbol may include internationally recognized alphabetic or numeric indications. All symbols used shall follow the design principles laid down in paragraph 4. of ISO 2575:20042575:2021.
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Q2Why it changed

Proposed by
Expert from the Netherlands
Working party
GRSG, 129th session (April 2025)

Reasons

  • According to the GRSG report, GRSG-129-15 updates the ISO standard by taking into account new features and associated symbols.

    Source
    “introduced GRSG-129-15, that updates the ISO standard by taking into account new features and associated symbols.”

  • Proposer's reason (informal document GRSG-129-15)

    The proposal states that the updated ISO standard is not considered to make a new series of amendments necessary. It also states that applying the new standard for newly added symbols in existing UN R121 approvals and for new approvals is considered appropriate.

    Submitted by Expert from the Netherlands. Working party adoption: ECE/TRANS/WP.29/GRSG/108, para. 22.

    Sources (2)
    “The updated ISO standard is not considered to make it necessary to introduce a new series of amendments.”
    “It is considered appropriate to apply the new standard for newly added symbols in existing UN R121 approvals and for new approvals.”

Document trail

  1. —ProposalGRSG-129-15Netherlands proposal to update the reference to ISO 2575
  2. —Working party adoptsECE/TRANS/WP.29/GRSG/108GRSG session report, para. 22
  3. 2025-08Sent to WP.29ECE/TRANS/WP.29/2025/108Text that GRSG sent to WP.29 and AC.1
  4. 2025-11WP.29 adoptsECE/TRANS/WP.29/1188Adopted at the 197th session (session report, para. 110)
  5. 2026-06-04In forceC.N.222.2026.TREATIES-XI.B.16.121UN depositary notification

Q3Who is affected

Vehicle manufacturer

  • Make sure that all symbols used follow the design principles in paragraph 4. of ISO 2575:2021 (paragraph 5.2.2.).
  • Follow the paragraph 5 guidelines of ISO 2575:2021 for colours of indicators, tell-tales and identifications not listed in Table 1.

Component supplier

  • For a control, tell-tale or indicator not in Table 1, consider an existing, suitable ISO 2575:2021 symbol.

Technical service / Approval authority

  • Use ISO 2575:2021 instead of ISO 2575:2004 when you check symbols and colours under the amended paragraphs.

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ⓘ This report gives advice only. It is not legal or type-approval advice.

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