9-3 Hatchback (9400) L4-2.0L Turbo (B205) (2000)
Main unit outputs, bus
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Time RDS (hours, minutes, seconds) used by SID (541)
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Date RDS (0 - 31) used by SID (541)
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Month RDS (Jan - Dec) used by SID (541)
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Sound (acoustic information) used by SID (541)
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Text messages (text information for main unit) used by SID (541)
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CD changer control used by CD changer (355)
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Diagnostics communication,
Main Unit
The main unit is connected to the wiring harness and the bus via 3 connectors (A, B, C) and an 8-pin DIN connector (for the external amplifier).
The purpose of the main unit is to control the system units and functions as a central unit in the audio system, as follows:
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To activate the audio system units by sending "wake-up" information.
"wake-up" can be information sent via the bus or a logic voltage (trigger voltage) via the wiring harness. When the "wake-up"