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92 Electrical system
9-3
Main instrument unit, MIU
A new main instrument unit with several
modifications has been introduced on the Saab
9-3. All the electronics and other components
are now combined on one circuit board, thus
reducing the depth and weight of the main
instrument unit. Instrument lighting comprises
only LEDs, which provide less harsh light and
are very reliable.
Four new warning and indicator lamps have
been added and certain functions have been
revised.
The following changes have also been made:
• Only one 22-pin connector.
• All lamp bulbs have been replaced with
LEDs. Some lamps have been moved.
• Stepping motors for all gauges instead of
moving coil instruments. The stepping motors
are controlled internally by the main
instrument unit control module. The main
instrument unit calibrates the stepping motors
automatically as soon as the instrument is
powered up (+30). The motors then take up a
mechanical stop position on their shafts.
• Only the front glass and complete units are
available as spare parts.