GB/T 20716.2-2025Road vehicles - Connectors for the electrical connection of towing and towed vehicles(7-pole) - Part 2: Connectors for braking systems and running gears of vehicles with 12 V nominal supply voltage (English PDF)

Foreword

This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for

Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents.

This Document is Part 2 of GB/T 20716 Road Vehicles - Connectors for the Electrical

Connection of Towing and Towed Vehicles (7-Pole). GB/T 20716 consists of the following parts.

--- Part 1.Connectors for braking systems and running gears of vehicles with 24 V nominal

supply voltage;

--- Part 2.Connectors for braking systems and running gears of vehicles with 12 V nominal

supply voltage.

This Document replaced GB/T 20716.2-2006 Road Vehicles – Connectors for the Electrical

Connection of Towing and Towed Vehicles - Part 2.Connectors for Braking Systems and

Running Gears of Vehicles with 12V Nominal Supply Voltage. Compared with GB/T 20716.2-

2006, the major technical changes are as follows besides the structural adjustments and editorial

modifications.

a) Change the content of footnote b in Figure 1 (see 4.2 of this Edition; 4.2 of the 2006

Edition);

b) Change Figure 2 and its footnote, adding g (see 4.3 of this Edition; 4.3 of the 2006

Edition);

c) Delete the content of "Connector location and free space" (see 5.2 of the 2006 Edition);

d) Change the durability cycle from 1,000 to 10,000 (see 6.4 of this Editon; 6.4 of the 2006

Edition).

This Document equivalently adopted ISO 7638-2.2018 Road Vehicles – Connectors for the

Electrical Connection of Towing and Towed Vehicles – Part 2.Connectors for Braking Systems

and Running Gears of Vehicles with 12V Nominal Supply Voltage.

This Document made the following minimum editorial modifications.

--- To keep constant with the current standard, change the standard name into Road Vehicles

- Connectors for the Electrical Connection of Towing and Towed Vehicles (7-Pole) – Part

2 Connectors for Braking Systems and Running Gears of Vehicles with 12 V Nominal

Supply Voltage.

--- Correct the typo in the title of the normative referenced document ISO 7638-1 in the

international standard by changing "Part 2" to "Part 1" and "12 V" to "24

V".

Road Vehicles – Connectors for the Electrical Connection of

Towing and Towed Vehicles (7-Pole) – Part 2.Connectors for

Braking Systems and Running Gears of Vehicles with 12V

Nominal Supply Voltage

1 Scope

This Document specifies the dimensional characteristics, contact distribution, testing and

requirements for a 7-pole electrical connector for the braking systems and running gears

between a towing and towed vehicles with a nominal voltage of 12 V. It also specifies a storage

socket for storing the plug when the plug and socket are separated.

This Document applies to Category N towing vehicles with a nominal voltage of 12 V and is

for reference only for other vehicles.

2 Normative References

The provisions in following documents become the essential provisions of this Document

through reference in this Document. For the dated documents, only the versions with the dates

indicated are applicable to this Document; for the undated documents, only the latest version

(including all the amendments) is applicable to this Document.

ISO 4091 Road vehicles – Connectors for the electrical connection of towing and towed

vehicles – Definitions, tests and requirements

NOTE. GB/T 5053.3-2006 Road vehicles - Connectors for the electrical connection of towing and

towed vehicles - Definitions tests and requirements (ISO 4091.2003, IDT)

ISO 4141 (all parts) Road vehicles – Multi-core connecting cables

NOTE. GB/T 5054 (all parts) Road vehicles - Multi-core connecting cables [ISO 4141 (all parts)]

ISO 7638-1 Road vehicles – connectors for the electrical connection of towing and towed

vehicles – Part 1.Connectors for braking systems and running gear of vehicles with 24V

nominal supply voltage

NOTE. GB/T 20716.1-2006 Road vehicles - Connectors for the electrical connection of towing and

towed vehicles - Part 1.Connectors for braking systems and running gears of vehicles with 24V

nominal supply voltage (ISO 7638-1.2003, IDT)

ISO 11992-1 Road vehicles – Interchange of digital information on electrical connections

between towing and towed vehicles – Part 1.Physical and data-link layers

NOTE. GB/T 43192.1-2023 Road vehicles - Interchange of digital information on electrical

connections between towing and towed vehicles - Part 1.Physical and data-link layers (ISO 11992-

1.2019, IDT)

ISO 11992-2 Road vehicles – Interchange of digital information on electrical connections

between towing and towed vehicles – Part 2.Application layer for brakes and running gear

ISO 12098 Road vehicles – Connectors for the electrical connection of towing and towed

vehicles – 15-pole connector for vehicles with 24V nominal supply voltage

NOTE. GB/T 20717-2024 Road vehicles - Connectors for the electrical connection of towing and

towed vehicles (15-pole) - 15-pole connector for vehicles with 24 V nominal supply voltage (ISO

12098.2020, IDT)

3 Terms and Definitions

For the purposes of this Document, the terms and definitions given in ISO 4091 apply.

The websites for terminology databases used for standardization maintained by ISO and IEC

are as follows.

4 Dimensional Characteristics

5 Connector Application