Technical Service Bulletin SB2345 — 2011 VAN HOOL TD925

Two different types of step nose lighting units have been installed during manufacturing.  The early units (which are limited available as spare part) are provided with a LED card for the “downward” light and an optical fiber for the “upward” light. These units have a small circuit board with a resistor to reduce the 24V power supply to an operating voltage of 3V for the optical fiber (refer also to figure 1).  The new units have an optical fiber for both the “downward” and “upward” light, and do not have a circuit board to reduce the voltage supply. These lighting units may not be connected directly to a 24V power supply but must be used together with special controllers. Failure to do will cause the immediate irreversible breakdown of the lighting unit due to overvoltage! Please also note that the “downward” light on new units is less bright. This service bulletin provides you with information on how the new step nose lighting units are connected to the vehicle wiring.