UN R121 Supplement 5 (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 5 to the 01 series of amendments
Supplement 4 → 5
- What changed
- Either low tyre pressure tell-tale may now also be used to indicate a tyre pressure refill system (TPRS) and central tyre inflation system (CTIS) malfunction.
- Before, footnote 16 to Table 1 named a tyre pressure monitoring system (TPMS) malfunction.
- Why
- The proposal aims to apply the same tell-tale requirements for TPRS and CTIS as already in place for TPMS.
- The proposal says that, for type approval applications, TPRS and CTIS can be seen as equivalent to TPMS.
Q1What changed1 change
Low tyre pressure tell-tales for a TPRS and CTIS malfunction (Table 1, footnote 16)
Footnote 16 to Table 1 now also names a tyre pressure refill system (TPRS) and a central tyre inflation system (CTIS). Either of the low tyre pressure tell-tales may now also be used to indicate a TPRS and CTIS malfunction. Before, the footnote named a tyre pressure monitoring system (TPMS) malfunction.
Q2Why it changed
- Proposed by
- Expert from the Netherlands on behalf of the GRBP Task Force Tyre Pressure Monitoring System and Tyre Installation (TF TPMSTI)
- Working party
- GRSG, 122nd session (October 2021)
Reasons
The GRBP Task Force on TPMSTI prepared the text to apply the same tell-tale requirements for TPRS and CTIS as already in place for TPMS.
Source
“prepared by the GRBP Task Force on TPMSTI to apply the same tell-tale requirements for tyre pressure refill systems (TPRS) and central tyre inflation systems (CTIS) as already in place for tyre pressure monitoring systems (TPMS).”
The proposal refers to the 01 series of amendments to UN Regulation No. 141. This series introduces vehicles of categories M2, M3, N2, N3, O3 and O4 into the scope of that regulation. The proposal says that, with this, TPRS and CTIS will be introduced “in this UN Regulation”.
Sources (2)
“With the introduction of vehicles of category M2, M3, N2, N3, O3 and O4 into the scope UN Regulation No. 141 through its 01 series of amendments”
“the tyre pressure refill system (TPRS) and the central tyre inflation system (CTIS) will be introduced”
The proposal says that, for type approval applications, TPRS and CTIS can be seen as equivalent to TPMS. It says that they need to be able to use the same tell-tales and tell-tale functions.
Source
“For type approval applications these systems can be seen as equivalent to tyre pressure monitoring systems (TPMS) and need to be able to use the same tell-tales and tell-tale functions.”
Document trail
- 2021-07ProposalECE/TRANS/WP.29/GRSG/2021/30Proposal by the expert from the Netherlands on behalf of TF TPMSTI
- —Working party adoptsECE/TRANS/WP.29/GRSG/101GRSG session report, para. 90
- 2021-12Sent to WP.29ECE/TRANS/WP.29/2022/22Text that GRSG adopted and sent to WP.29 and AC.1
- 2022-03WP.29 adoptsECE/TRANS/WP.29/1164Adopted at the 186th session (session report, para. 132)
- 2022-10-08In forceC.N.354.2022.TREATIES-XI.B.16.121UN depositary notification
Q3Who is affected
Vehicle manufacturer
- Decide whether to use either of the low tyre pressure tell-tales to indicate a TPRS and CTIS malfunction (footnote 16).
Component supplier
- No direct action for this role.
Technical service / Approval authority
- No direct action for this role.
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ⓘ This report gives advice only. It is not legal or type-approval advice.