Turn signal lamps / Hazard warning signal flashers
This function is controlled by the left control stalk. The steering wheel module (SWM) (3/130) sends data to the central electronic module (CEM) (4/56) to activate the turn signal lamps via the control area network (CAN). The central electronic module (CEM) transmits information to the driver information module (DIM) (5/1) to activate the turn signal indicator lamp and powers the turn signal lamp via a shunt (20/32, 20/34).
The power supply is pulsed and the turn signal lamps are activated 90 times per minute.
The hazard warning signal flasher is activated by closing the switch (3/6) and transmits a signal to the central electronic module (CEM) to start the function. The central electronic module (CEM) transmits a signal in the same way as above, but to both sides. The central electronic module (CEM) also transmits a signal to the bulb in the switch to indicate that the hazard warning signal flashers are on. If the ignition key is in position I or II, there is a clicking sound from the driver information module (DIM). If the ignition is switched off, there is no sound, but the hazard warning signal flashers continue to flash.
If a fault occurs with a lamp, the central electronic module (CEM) detects the reduction in power consumption and the frequency is doubled on the side where the fault occurred.