General
The background lighting of all LC display fields is provided by(LEDs ). The LEDs provide the background lighting for the field service interval display (SIA ) together with gear display, total odometer with trip odometer and outside temperature or functions of the on-board computer display and the field for check control messages.
On-board computer functions
If no on-board computer functions are envisaged and coded, instead of them, the instrument cluster (basic) only features the outside temperature display.
Check-control messages
As optional equipment (standard in certain models), the instrument cluster (basic) features an LC display field for check-control messages. The background lighting of the vehicle symbol is only switched on by the light check module when a check-control message is applicable. Light faults for left and right low beam, left and right reversing light, left and right brake light are displayed in the LC display field for check-control messages. In the case of a defective brake light switch, both brake lights are indicated as a light fault. If the centre brake light is defective, the light check module sets the symbol for the right-hand brake light. Light fault statuses occurring simultaneously are displayed in parallel.
The "top up wash water" message is also displayed in the form of a pictogram in the display field for the check-control messages. The light fault messages and the "top up wash water" message are sent by the light check module via the body bus (K-bus ) to the instrument cluster. The "top up wash water" message has a priority status in the display system. When the message is received, it is retained until the next terminal 15 "OFF" goes out after 60 seconds. The message is re-evaluated during the next terminal 15 "ON".
The four doors and the boot/trunk lid can be displayed separately for the "door open" message. These messages are sent on the body bus (K-bus ) from the general module to the instrument cluster.