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Operation




OPERATION

General
Feed from the positive battery terminal (C0192) is supplied to fusible link 1 and fusible link 4 of the engine compartment fuse box (C0632) on an R wire. Fusible link 4 (C0574) is connected to fuse 9 of the passenger compartment fuse box (C0587) by an NW wire. Fuse (C0585) provides a constant battery feed to the following on P then PK wires:
- The head unit (C0921)
- The CD autochanger (C0941)
- The power amplifier (C0491).

Fusible link 1 is connected in series with fusible link 2, which is also located in the engine compartment fuse box. Fusible link 2 (C0571) is connected to the ignition switch (C0028) by an NR wire. When the ignition switch is turned to the 'auxiliary' position, current flows across the switch (C0028) to fuse 11 of the passenger compartment fuse box (C0588) on a PS wire. Fuse 11 (C0580) provides an auxiliary ignition feed to the head unit (C0921) and the remote control interface unit (C1897) on LGW wires.

Speakers
The head unit (C0092) is connected to the power amplifier (C0491) as follows:
- A positive signal is provided by the head unit to the power amplifier on a BG wire. This signal is used by the power amplifier for the RH rear speakers.
- A negative signal is provided by the head unit to the power amplifier on a BO wire. This signal is used by the power amplifier for the RH rear speakers.
- A positive signal is provided by the head unit to the power amplifier on a BP wire. This signal is used by the power amplifier for the RH front speakers.
- A negative signal is provided by the head unit to the power amplifier on a BU wire. This signal is used by the power amplifier for the RH front speakers.
- A positive signal is provided by the head unit to the power amplifier on a BW wire. This signal is used by the power amplifier for the LH front speakers.
- A negative signal is provided by the head unit to the power amplifier on a BS wire. This signal is used by the power amplifier for the LH front speakers.
- A positive signal is provided by the head unit to the power amplifier on a BN wire. This signal is used by the power amplifier for the LH rear speakers.
- A negative signal is provided by the head unit to the power amplifier on a BR wire. This signal is used by the power amplifier for the LH rear speakers.

The power amplifier (C0491) receives inputs from the head unit (C0092) and relays them to the speakers as follows:


NOTE: The LH and RH speakers share the same connector numbers as they utilize the same door harness


- A positive signal is provided by the power amplifier to the RH front mid-range speaker (C0369) on an OK wire. The RH front mid-range speaker (C0369) is provided a negative signal by the power amplifier (C0491) on an OB wire.
- A positive signal is provided by the power amplifier to the RH front high range speaker (C0680) on an OK wire. The RH front high range speaker (C0680) is provided a negative signal by the power amplifier (C0491) on an OB wire.
- A positive signal is provided by the power amplifier to the LH front mid-range speaker (C0369) on a YK then OK wire. The LH front mid-range speaker (C0369) is provided a negative signal by the power amplifier (C0491) on a YB then OB wire.
- A positive signal is provided by the power amplifier to the LH front high range speaker (C0680) on a YK then OK wire. The LH front high range speaker (C0680) is provided a negative signal by the power amplifier (C0491) on an YB then OB wire.
- A positive signal is provided by the power amplifier to the RH rear mid-range speaker (C1577) on a UK wire. The RH rear mid-range speaker (C1577) is provided a negative signal by the power amplifier (C0491) on a UB wire.
- A positive signal is provided by the power amplifier to the RH rear high range speaker (C0679) on a UK wire. The RH rear high range speaker (C0679) is provided a negative signal by the power amplifier (C0491) on a UB wire.
- A positive signal is provided by the power amplifier to the LH rear mid-range speaker (C1577) on an SK then UK wire. The LH rear mid-range speaker (C1577) is provided a negative signal by the power amplifier (C0491) on an SB then UB wire.
- A positive signal is provided by the power amplifier to the LH rear high range speaker (C0679) on an SK then UK wire. The LH rear high range speaker (C0679) is provided a negative signal by the power amplifier (C0491) on an SB then UB wire.


NOTE: It is essential that all speakers are connected correctly. A speaker connected incorrectly will be out of phase with the remaining speakers, causing a deterioration of sound quality.


Remote Control Interface Unit
The remote control interface unit (C1897) is provided an ignition feed via fuse 11 of the passenger compartment fuse box (C0580) on an LGW wire. The interface unit enables the head unit to communicate with the remote audio controls, and is earthed on a B wire.

Remote Audio Controls
The remote control interface unit (C1897) provides a feed via the rotary coupler (C0082) to the remote audio controls (C1254) on a BR wire. The remote audio controls contain a number of normally open switches and resistors. When either of the controls are moved, one of the switches closes and a voltage is returned to the interface unit (C1897) on a BW wire. The value of the voltage returned to the interface unit is dependent upon which way the controls are moved (and how many resistors are brought into the circuit). By measuring this returned voltage, the interface unit determines which function has been requested. The interface unit (C1897) converts this input into an Instrument (I) bus protocol message which it outputs to the head unit on a K wire.
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