ISO 13207-1-2012 pdf free download.Road vehicles – LED lamp characteristics for bulb compatible failure detection一 Part 1: LED lamps used as direction indicators.
5 Other dimensions
The lamp current i2 should be below 30 mA for the failure condition and above 60 mA (at 24 V) for the non- failure condition to enable usage of plain constant-measurement circuits with two levels (below 30 mA means non-functional LED-lamp). Other details, not specified, are left to the manufacturer’s choice.
6 Further details
It is not possible to check whether the system is functioning before the first flashing process. The system should function under the environmental and test conditions specified in ISO 16750 (all parts). The total number of LED direction indicators and conventional lamps in one measuring circuit is limited to 4. The operating voltage range for the pulse control shall between 18 V up to 32 V.
7 Trailer detection
7.1 General
To facilitate uniform trailer detection by the towing unit, a resistance load of 820 for standardization of the detection function for direction indicators is specified.
7.2 Method for powerless trailer detection
In the input circuit of a LED lamp, a resistor R 820 c is connected to ground via an electronic power switch (Si): see Figure 4. The power switch is closed when the input voltage (Eli) is between 0 and 10 V. When the voltage increases to values> 10 V, the power switch is turned to open and disconnects the resistor from the input circuit.
The advantage of this method is that the power consumption of the resistor can be determined at 250 mW.
For a powerless trailer detection, an ECU connects a voltage U, e.g. over a pull-up resistor, to the LED lamp. If a trailer is present, the voltage is low; if a trailer is not present, the voltage is high.ISO 13207-1 pdf download.