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 9 (C0585) provides a constant battery feed to the head unit (C0098) on a P wire. The head unit uses this feed to power its memory circuits, and is earthed (C0098) on a B wire. Fuse 9 (C0585) also provides a feed to the CD autochanger (if fitted) (C0941) on a P wire.

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 (C0098) on an LGW wire.

Speakers
The head unit (C0098) is connected to the speakers as follows:


NOTE: The LH front and RH front mid-range and high range speakers share the same connector numbers as they utilize the same door harness. The same is true of the LH and RH rear mid-range speakers.


- A positive signal is provided by the head unit 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 head unit (C0098) on an OB wire.
- A positive signal is provided by the head unit to the RH front high range speaker (C0531) on an OK wire. The RH front high range speaker (C0530) is provided a negative signal by the head unit (C0098) on an OB wire.
- A positive signal is provided by the head unit 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 head unit (C0098) on a YB then OB wire.
- A positive signal is provided by the head unit to the LH front high range speaker (C0531) on a YK then OK wire. The LH front high range speaker (C0530) is provided a negative signal by the head unit (C0098) on a YB then OB wire.
- A positive signal is provided by the head unit 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 head unit (C0098) on a UB wire.
- A positive signal is provided by the head unit to the RH high range speaker (C0679) on a UK wire. The RH rear high range speaker (C0679) is provided a negative signal by the head unit (C0098) on a UB wire.
- A positive signal is provided by the head unit 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 head unit (C0098) on an SB then UB wire.
- A positive signal is provided by the head unit to the LH rear high range speaker (C0679) on an SK then UK wire. The LH rear mid-range speaker (C0679) is provided a negative signal by the head unit (C0098) 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 Audio Controls
The head unit (C0098) 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 head unit (C0098) on a BW wire. The value of the voltage returned to the head 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 head unit determines which function has been requested.

CD Autochanger
The CD autochanger (C0941) is provided a constant battery feed via fuse 9 of the passenger compartment fuse box (C0585) on a P wire. The autochanger (C0941) is earthed on a B wire.