Rheostat level

Fig 1: Communication Diagram - Rheostat Level

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Locating Bulbs Holes

Courtesy of SAAB-SCANIA OF AMERICA, INC.

The SID unit is connected to the rheostat and controls the button lighting in the SID unit. It is also used to calculate the display lighting level.

The buttons are illuminated by 2 bulbs and the display by 4 bulbs, all easily accessible from the rear of the SID unit.

When the main light switch is ON, bus information is sent: RHEOSTAT LEVEL, unit %. The information is used by the ACC, Audio, DICE and MIU to regulate the button and instrument lighting.

Rheostat level 0% is sent if:

• The main light switch is OFF
• The interior light exceeds a certain level.

The information is used by the ACC, Audio, DICE and MIU which then extinguishes the button and instrument lighting.