Standard No.:	GB 4785-2019
English Name:	Prescription for installation of the external lighting and light-signalling devices for motor vehicles and their trailers
Chinese Name:	汽车及挂车外部照明和光信号装置的安装规定
Chinese Classification:	T38    Lighting and signaling equipment
Professional Classification:	GB    National Standard
ICS Classification:	43.040.20 43.040.20    Lighting, signalling and warning devices 43.040.20
Issued by:	SAMR and SAMR
Issued on:	2019-12-17
Implemented on:	2020-7-1
Status:	valid
Superseding:	GB 4785-2007 Prescription for installation of the external lighting and light-signalling devices for motor vehicles and their trailers GB 4785-2007/XG2-2015 Prescription for installation of the external lighting and light-signalling devices for motor vehicles and their trailers , includes Amendment 2
Language:	English
File Format:	PDF
Word Count:	35000 words
Price(USD):	500.0
Delivery:	via email in 1 business day

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. All the technical contents of this standard are mandatory. This standard is developed in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB 4785-2007 Prescription for installation of the external lighting and light-signalling devices for motor vehicles and their trailers. In addition to editorial changes, the following main technical changes have been made with respect to GB 4785-2007: ——graphical representations for geometric visibility of various lamps are deleted (see Figures 1, 2 and 5 to 18 in Edition 2007); ——“test method” is deleted (see Clause 5 in Edition 2007); ——relevant definition of “equivalent lamp" is deleted (see Sub-clause 3.5.1 in Edition 2007); ——considering the development of light source, the definition and requirements of light source and its relevant terms are supplemented and improved (see Sub-clause 3.7); ——relevant definition and requirements of “interdependent lamp system” are added (see Sub-clause 3.9.26); ——definitions and requirements of manoeuvring lamp, cornering lamp, conspicuity marking, rear-end collision alert signal, adaptive front lighting system and their terms concerned are added (see Sub-clauses 3.9.29, 5.25, 3.9.24, 5.20, 3.9.15, 5.21, 3.9.30, 5.26, 3.9.25 and 5.22); ——definitions of light emitting surface, illuminating surface and apparent surface are different from those given in GB 4785-2007, and corresponding diagrams are added (see Subclauses 3.10, 3.11 and 3.12 as well as Annex B); ——"the vehicles with daytime running lamp shall have the function of automatically turning on/off the passing-beam headlamp; or at least the rear position lamp shall be turned on when the daytime running lamp is turned on; or corresponding measures shall be taken to remind the driver that the rear position lamp and other signal lamps are not turned on when the daytime running lamp is turned on” is added (see Sub-clause 5.2.7.6); ——requirements and test methods for relevant road tests of the front lighting system are added (see Sub-clauses 5.1.9.3.3 and 5.22.9.2.4); ——lamps not defined in this standard that are allowed to be turned on when the vehicle is stationary and the corresponding turn-on conditions are added (see Sub-clause 4.31). Technical contents of this standard are referred to ECE R48 Series 06 Uniform provisions concerning the approval of vehicles with regard to the installation of lighting and light-signalling devices and its supplements 1 to 6. This standard was proposed by and is under the jurisdiction of the Ministry of Industry and Information Technology of the People's Republic of China. The previous editions of this standard are as follows: ——GB 4785-1984, GB 4785-1998 and GB 4785-2007. Prescription for installation of the external lighting and light-signalling devices for motor vehicles and their trailers 1 Scope This standard specifies the general requirements, special prescription and inspection rules for the installation of the external lighting and light-signalling devices for motor vehicles and their trailers. This standard is applicable to Categories M, N and O motor vehicles and their trailers. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies. GB/T 3977 Specification of colors GB 4094 Symbols for controls, indicators and tell-tales of motor vehicles GB 4599 Motor vehicle headlamps equipped with filament lamps GB 4660 Photometric characteristics of power-driven vehicle front fog lamps GB 5920 Photometric characteristics of front and rear position lamps, end-outline marker lamps and stop lamps for motor vehicles and their trailers GB 11554 Photometric characteristics of rear fog lamp for power-driven vehicles and their trailers GB 11564 Retro-reflector device for motor vehicles GB 12676 Technical requirements and testing methods for commercial vehicle and trailer braking systems GB 15235 Photometric characteristics of reversing lamps for power-driven vehicles GB 15766.1 Lamps for road vehicles - Dimensional, electrical and luminous requirements GB 17509 Photometric characteristics of direction indicators for motor vehicles and their trailers GB 18099 Photometric characteristics of side-marker lamps for motor vehicles and their trailers GB 18408 Photometric characteristics of devices for the illumination of rear registration plates of motor vehicles and their trailers GB 18409 Photometric characteristics of parking lamps for power-driven vehicles GB 21259 Headlamps equipped with gas-discharge light sources for motor vehicle GB/T 21260 Headlamp cleaner GB 21670 Technical requirements and testing methods for passenger car braking systems GB 23254 Retro-reflective markings for trucks and trailers GB 23255 Photometric characteristics of daytime running lamps for power driven vehicles GB 25990 Rear-marking plates for vehicles and their trailers GB 25991 Automotive headlamps with LED light sources and/or LED modules GB/T 30036-2013 Adaptive front-lighting system for motor vehicles GB/T 30511 Photometric characteristics of cornering lamps for motor vehicle ECE R37 Uniform provisions concerning the approval of filament lamps for use in approved lamp units of power-driven vehicles and of their trailers 3 Terms and definitions For the purpose of this document, the following terms and definitions apply. 3.1 type test the type test on a certain vehicle type with regard to the number and mode of installation of external lighting and light-signalling devices 3.2 vehicle type with regard to the installation of lighting and light-signalling devices Vehicles that do not differ in the following contents are considered to be of the same vehicle type: ——profile and size of the vehicle; ——number and position of installations; ——headlamp dimming device; ——suspension system. Under the following circumstance, the vehicles can be regarded as the same type: some differences between vehicles in the above aspects don’t change the variety, quantity, position, geometric visibility, passing beam inclination and installation of optional lamps or not. 3.3 transverse plane the vertical plane orthogonal to the longitudinal symmetry plane of the vehicle 3.4 unladen vehicle the vehicle without driver, attendant, passenger or load, but with sufficient fuel, spare tire and common tools. 3.5 laden vehicle the vehicle that the maximum mass is technologically allowed by the loading manufacturer, with the loading conditions distributed on the axle Note: see Annex A for loading conditions. 3.6 lighting and light-signalling device a unit, group of units or installation unit that is used to realize one or more functions 3.6.1 lighting function the function of lighting up the object on the traveling road or in the traveling direction of the vehicle 3.6.2 light-signalling function the function of sending or reflecting light signals to other road users, to indicate the presence of the vehicle or the change of the motion state 3.7 light source one or several luminary(ies), which may consist of one or more lampshades and one lamp cap for mechanical and electrical connection 3.7.1 replaceable light source the light source that can be inserted into and taken out from the lamp holder without tools 3.7.2 non-replaceable light source the light source that is fixed in the light source module or lighting unit and can only be replaced integrally with the light source module or lighting unit 3.7.3 light source module dedicated optical component of a device, including one or several non-replaceable light source(s) It may be provided with a lamp holder that meets the requirements of the replaceable light source. 3.7.4 filament light source the light source that the filament lamp illuminates through heating of the filament itself 3.7.5 gas-discharge light source the light source that illuminates through arc discharge 3.7.6 light-emitting diode; LED a solid light source that is made of semiconductor material 3.7.7 LED module the light source module that contains only LED light source and may be provided with a lamp holder that meets the requirements of the replaceable light source. 3.7.8 objective luminous flux the luminous flux specified in the data pages of the light source standards, excluding tolerance Note 1: Light source standards include GB 15766.1, ECE R37, ECE R99, ECE R128, etc. Note 2: For LED module that does not meet the requirements of ECE R128, its objective luminous flux is indicated in its technical document. 3.8 electronic light source control gear one or several component(s) for controlling the voltage and/or current of the light source between the power source and the light source 3.8.1 ballast an electronic light source control device for stabilizing the current of the gas-discharge light source between the power source and the light source (allowed to be integrated into the light source or lamp) 3.8.2 ignitor an electronic light source control device for igniting an arc of the gas-discharge light source 3.8.3 variable intensity control a device that can automatically control a variable light intensity signal device to emit stable and recognizable light signals Note: the variable intensity control may be a part of the lamp or vehicle, or independent of the above lamp and vehicle. 3.9 lamp a device used to light up the road or send light signals to other road users Note: The rear-registration plate illuminating device and retro-reflector also fall under the lamps. 3.9.1 independent lamps a device with separate apparent surface, separate light source and separate lamp body in the direction of the reference axis Note: For the rear-registration plate illuminating devices and Category 5 and 6 direction-indicatorlamp, the apparent surface in this definition is replaced by the light emitting surface. 3.9.2 grouped lamps a device with separate apparent surface, separate light source and common lamp body in the direction of the reference axis Note: For the rear-registration plate illuminating devices and Category 5 and 6 direction-indicatorlamp, the apparent surface in this definition is replaced by the light emitting surface. 3.9.3 combined lamps a device with separate apparent surface, common light source and common lamp body in the direction of the reference axis Note: For the rear-registration plate illuminating devices and Category 5 and 6 direction-indicatorlamp, the apparent surface in this definition is replaced by the light emitting surface. 3.9.4 reciprocally incorporated lamps a device with separate light source or single light source operating under different circumstances (such as optical, mechanical and electrical differences), and common apparent surface and common lamp body in whole or in part, in the direction of the reference axis Note: For the rear-registration plate illuminating devices and Category 5 and 6 direction-indicatorlamp, the apparent surface in this definition is replaced by the light emitting surface. 3.9.5 single-function lamp the relevant part of a device that produces a single illumination or light signal function 3.9.6 concealable lamp the lamp that can be partially or wholly concealed by moving the cover, or the lamp, or by other appropriate methods when not in use 3.9.7 driving-beam headlamp; main-beam headlamp the lamp for lighting up the road at a long distance in front of the vehicle 3.9.8 passing-beam headlamp; dipped-beam headlamp the lamp for lighting up the road in front of the vehicle without glare or discomfort to the driver and other road user 3.9.8.1 principal passing-beam; principal dipped-beam a passing beam excluding infrared (IR) emitter and/or an additional light source for bend lighting 3.9.9 direction-indicatorlamp the lamp for indicating to other road users that the vehicle will turn right or left Note: The direction-indicatorlamp also may be a part of the vehicle warning system. 3.9.10 stop lamp the lamp for indicating to other road users in rear of the vehicle that the vehicle is braking 3.9.11 rear-registration plate illuminating device a device for illuminating the space area of the rear-registration plate, which may consist of several optical elements 3.9.12 front position lamp the lamp that indicates the presence and width of the vehicle when viewed from the front of the vehicle 3.9.13 rear position lamp the lamp that indicates the presence and width of the vehicle when viewed from the rear of the vehicle 3.9.14 retro-reflector a device that indicates the presence of a vehicle to an observer located near a light source by reflecting light from an external light source 3.9.15 conspicuity marking the combination of reflective materials installed or pasted on the surface of the vehicle body to enhance the vehicle’s identifiability when viewed from the side or rear of the vehicle (or from the front of the trailer)

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 General requirements 5 Special prescription 5.1 Main-beam headlamps [Conforming to GB 4599 (except Level A), GB 21259 and GB 25991] 5.2 Passing-beam headlamps [Conforming to GB 4599 (except Level A), GB 21259 and GB 25991] 5.3 Front fog lamps (Conforming to GB 4660) 5.4 Reversing lamp (Conforming to GB 15235) 5.5 Direction-indicatorlamp (Conforming to GB 17509) 5.6 Hazard warning signal 5.7 Stop lamp (Conforming to GB 5920) 5.8 Rear-registration plate illuminating device (Conforming to GB 18408) 5.9 Front position lamps (Conforming to GB 5920) 5.10 Rear position lamp (Conforming to GB 5920) 5.11 Rear fog lamps (Conforming to GB 11554) 5.12 Parking lamp (Conforming to GB 18409) 5.13 End-outline marker lamp (Conforming to GB 5920) 5.14 Non-triangular rear retro-reflector (Conforming to GB 11564) 5.15 Triangular rear retro-reflector (Conforming to GB 11564) 5.16 Non-triangular front retro-reflector (Conforming to GB 11564) 5.17 Non-triangular side retro-reflector (Conforming to GB 11564) 5.18 Side marker lamp (Conforming to GB 18099) 5.19 Daytime running lamp (Conforming to GB 23255) 5.20 Cornering lamp (Conforming to GB 30511) 5.21 Conspicuity marking 5.22 Adaptive front lighting system (Conforming to GB/T 30036-2013) 5.23 Emergency stop signal 5.24 Marker lamp for draw-bar-trailer (Figure 4) 5.25 Manoeuvring lamp 5.26 Rear-end collision alert signal 6 Inspection rules 6.1 Judgement and test of same type 6.2 Type test 6.3 Production conformity test 6.4 Change and expansion of vehicle lighting and light-signalling devices 7 Implementation date Annex A (Normative) Various loading conditions determining the change of the passing beam in the vertical direction Annex B (Informative) Examples of surfaces, reference axis, centre of reference, and angles of geometric visibility of lamps Annex C (Normative) Invisibility of front view red light and invisibility of rearview white light Annex D (Normative) Measuring the change of passing beam inclination with loading Annex E (Normative) Road test Annex F (Normative) Adjustment indication of vertical downward inclination of cut-off line of headlamp passing beam and front fog lamp Annex G (Normative) Headlamp dimming device control Annex H (Normative) Automatically switching headlamp passing beam Annex I (Normative) Observation area of apparent surface of manoeuvring lamp Bibliography