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Home >> Saab >> 2000 >> 9-3 Base, 2D Hatchback, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Main Instrument Panel, Petrol - 9-3 >> Technical Description >> Instrument and display lighting, Trionic T7 >> Cabin light intensity >> Notes

Cabin light intensity: Notes

Fig 1: Identifying Cabin Light Intensity
G03463765Courtesy of SAAB-SCANIA OF AMERICA, INC.
Fig 2: Identifying Cabin Light Intensity Wiring
G03463766Courtesy of SAAB-SCANIA OF AMERICA, INC.

When the light intensity in the cabin exceeds a certain level, the SID unit sends out Rheostat value 0% on the bus.

To increase bulb life, the main instrument unit's control module turns off the following instrument lighting:

For better visibility, the brightness of the indicator and warning lamps is set to two different levels. Low brightness at night and high brightness during the day.

The SID unit sends information on cabin light intensity, unit Lux, to the bus and at a predetermined level the main instrument unit's control module changes the brightness of the following lamps.

Common to all these lamps is that they are supplied with current (+15 circuit) from the main instrument unit and grounded through its control module.

The brightness of the following lamps is changed between day and night in a similar way but they are all supplied with current from the component in question and grounded through the main instrument unit.