9-3 SE Convertible (9400) L4-2.0L Turbo (B205) HO (2001)
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General
Audio system 3 contains a separate amplifier unit that supplies the extra woofers in the front doors. The amplifier is connected to the wiring harness via
three different connectors.
Function
1. 2-pin connector
The amplifier unit is powered separately (+30 circuit) from fuse 25 to pin 2 and is grounded to grounding point G34P via pin 1 in the amplifier's
2-pin connector.
2. DIN connector
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When the audio system is activated, the trigger voltage is also supplied from pin 8 in the DIN connector to pin 8 in the amplifier's DIN
connector. The trigger voltage alerts the amplifier, which is then activated.
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The audio input signal (4 channels) is supplied from the main unit line outputs to the amplifier via the DIN connector. 2 of these 4 channels are
used.
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Mute control is fed from pin 6 in the DIN connector on the main unit to pin 6 in the amplifier's DIN connector to switch off the sound. This is
to avoid clicks in the loudspeakers when the ignition is turned on/off.
3. 4-pin connector
Audio output (2 channels) from the amplifier to the loudspeakers in the front doors via a 4-pin connector.
See: Specifications/Test Readings, Amplifier Connections
