Brake lights: Notes
The brake lights go on when the brake light switch is actuated.
The brake-light switch receives +30 voltage via fuse 1. When the brake pedal is depressed, the brake-light switch (29) closes and power is fed to the TWICE pin 48.
The brake lights get their power from pin 1 and pin 25, each through its own resistor inside TWICE. The control module measures the voltage drop across these resistors and thus determines the current that is passing through TWICE to each brake-light circuit.
The high-level brake light consists of five bulbs (30RC) which are powered and monitored from pin 24 on DICE.
The brake-light circuit is ready-equipped for trailer connection. In trailer service the circuit functions correspondingly, except that it uses fuse B (22a).