Advanced Automotive Fault Diagnosis
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LÔØI NOÙI ÑAÀU, ledklok
| 2.5.11 Colour codes and
terminal numbers This section is really more to be used as a refer- ence source. It is useful, however, to become familiar with a few key wire colours and terminal numbers when diagnosing electrical faults. As seems to be the case for any standardisation a number of colour code systems are in operation! For reference purposes I will just mention two. Firstly, the British Standard system (BS AU 7a: 1983): this system uses 12 colours to deter- mine the main purpose of the cable and tracer colours to further refine its use. The main colour uses and some further examples are given in the following table. Colour Symbol Destination/use Brown N Main battery feed Blue U Headlight switch to dip switch Blue/White UW Headlight main beam Blue/Red UR Headlight dip beam Red R Side light main feed Red/Black RB Left hand side lights and no. plate Red/Orange RO Right hand side lights Purple P Constant fused supply Green G Ignition controlled fused supply Green/Red GR Left side indicators Green/White GW Right side indicators Light Green LG Instruments White W Ignition to ballast resistor White/Black WB Coil negative Yellow Y Overdrive and fuel injection Black B All earth connections Slate S Electric windows Orange O Wiper circuits (fused) Pink/White KW Ballast resistor wire Green/Brown GN Reverse Green/Purple GP Stop lights Blue/Yellow UY Rear fog light Secondly there is a ‘European’ system used by a number of manufacturers and based broadly on the following table. Please note there is no correlation between the ‘Euro’ system and the British Standard colour codes. In particular note the use of the colour brown in each system! After some practice with the use of colour code sys- tems the job of the technician is made a lot easier when faultfinding an electrical circuit. Figure 2.5 Faultfinding by luck! Colour Symbol Destination/use Red Rt Main battery feed White/Black Ws/Sw Headlight switch to dip switch White Ws Headlight main beam Yellow Ge Headlight dip beam Grey Gr Side light main feed Grey/Black Gr/Sw Left hand side lights Grey/Red Gr/Rt Right hand side lights Black/Yellow Sw/Ge Fuel injection Black/Green Sw/Gn Ignition controlled supply Black/White/Green Sw/Ws/Gn Indicator switch Black/White Sw/Ws Left side indicators Black/Green Sw/Gn Right side indicators Light Green LGn Coil negative Brown Br Earth Brown/White Br/Ws Earth connections Black Sw Reverse Black/Red Sw/Rt Stop lights Green/Black Gn/Sw Rear fog light A system now in use almost universally is the terminal designation system in accordance with DIN 72 552. This system is to enable easy and correct connections to be made on the vehicle, tải về 7.07 Mb. Chia sẻ với bạn bè của bạn:
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