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External Amplifier (AS3)

External Amplifier (AS3)





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

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.

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.

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 Test readings, amplifier connections .