Operation

ICE/Satellite Navigation Operation

Head unit
When the power switch on the head unit is turned on, an enable signal is sent from the head unit to the power amplifier. The enable signal consists of a powerfeed on an RU wire via header C0285 LHD/C0761 RHD.

A road speed signal, for the automatic volume control and satellite navigation functions, is input to the head unit on an O wire from the instrument pack

A reverse signal, for the satellite navigation function, is input to the head unit on a GN wire from the reverse lamp switch (manual gearbox) or the starter inhibitor/reverse light switch (automatic gearbox), via header C0287 LHD/C0294 RHD.

Where a telephone is installed, signals are input to the head unit from the accessory power connector. When the telephone is active, a mute signal is input on a PO wire. The telephone circuit positive is input on an SO wire and the telephone circuit negative is input on a YG wire.

Serial communications link
K wires connected between the head unit, interface module and CD autochanger, via splice A217, provide a serial communications link for operation of the CD autochanger and head unit, using either the remote switches or the switches on the head unit.

Remote control switches
The remote control switches are connected to the interface module by an SR wire and an SB wire via the rotary coupler. The switches form a resistance ladder between the two wires, with the resistance dependent on which switch is pressed. The interface module monitors the two wires and converts their input into Instrument (I) bus protocol messages, which it outputs on the serial communications link.

CD auto changer connections
The right channel positive input of the CD autochanger is connected to the head unit by a W wire. The left channel positive input of the CD autochanger is connected to the head unit by an R wire.

The left and right channel negative inputs of the CD autochanger are both connected to splice SJ1, which is connected to a common connection on the head unit by an S wire. The left channel negative input is connected from the CD autochanger to splice SJ1 by an S wire. The right channel negative input is connected from the CD autochanger to splice SJ1 by a B wire to connector interface C0912-2/C0911-2, then from the interface to the splice by a U wire.

RH rear speakers
The positive output from the head unit is connected by a BG wire to connector interface C0229-18/C0067-18 then by an R wire from the interface to the power amplifier. From the power amplifier the positive output continues on a SR wire to connector interface C0436-1/C0803-1 then on a BU wire from the interface to the RH rear door low range speaker. A second BU wire connects the positive output connection of the RH rear door low range speaker to the RH rear door high range speaker.

The negative output of the RH rear door high range speaker is connected by a BG wire to the RH rear door low range speaker. A second BG wire connects the negative output connection of the RH rear door low range speaker to connector interface C0436-2/C0803-2. From the interface the negative output is connected by an SP wire to the power amplifier. From the power amplifier the negative output is connected by a W wire to connector interface C0229-19/C0067-19, then by a BU wire to the head unit.

RH front speakers
The positive output from the head unit is connected by a BK wire to connector interface C0229-20/C0067-20, then by a G wire from the interface to the power amplifier. From the power amplifier the positive output continues on a KB wire to the RH front door mid range speaker via connector interface C0463-2/C0744-2 LHD or C0459-2/C0744-2 RHD. From the interface (C0463-2 LHD or C0459-2 RHD), a KB wire also supplies the positive output to the RH A post high range speaker.

The negative output of the RH front door mid range speaker is connected by an RB wire to the power amplifier via connector interface C0463-1/C0744-1 LHD or C0459-1/C0744-1 RHD. An RB wire also connects the negative output from the RH A post high range speaker to the connector interface (C0463-1 LHD or C0459-1 RHD). From the power amplifier the negative output is connected by an S wire to connector interface C0229-21/C0067-21, then by a BR wire to the head unit.

For the RH front door low range speaker the power amplifier supplies a positive output on a KG wire to connector interface C0459-3/C0744-3 then on a BK wire from the interface to the speaker. The negative output from the RH front door low range speaker returns on a BR wire to connector interface C0459-4/C0744-4, then on a KR wire to the power amplifier.

LH front speakers
The positive output from the head unit is connected by a BW wire to connector interface C0229-22/C0067-22, then by a Y wire from the interface to the power amplifier. From the power amplifier the positive output continues on a YB wire to connector interface C0459-1/C0744-1 LHD or C0463-1/C0744-1 RHD then on an RB wire from the interface to the LH front door mid range speaker. From the interface (C0459-1 LHD or C0463-1 RHD) a YB wire also supplies the positive output to the LH A post high range speaker.

The negative output of the LH front door mid range speaker is connected by a KB wire to connector interface C0459-2/C0744-2 LHD or C0463-2/C0744-2 RHD, then by a YK wire to the power amplifier A YK wire also connects the negative output from the LH A post high range speaker to the connector interface C0459-2 LHD or C0463-2 RHD). From the power amplifier, the negative output is connected by an O wire to connector interface C0229-23/C0067-23 then by a BN wire to the head unit.

For the LH front door low range speaker the power amplifier supplies a positive output on an OB wire to connector interface C0463-3/C0744-31 then on a BK wire from the interface to the speaker. The negative output from the RH front door low range speaker returns on a BR wire to connector interface C0463-4/C0744-41 then on an OK wire to the power amplifier.

LH rear speakers
The positive output from the head unit is connected by a BY wire to connector interface C0229-24/C0067-24, then by a U wire from the interface to the power amplifier. From the power amplifier the positive output continues on a SK wire to connector interface C0435-1/C0803-1 then on a BU wire from the interface to the LH rear door low range speaker. A second BU wire connects the positive output connection of the LH rear door low range speaker to the LH rear door high range speaker.

The negative output of the LH rear door high range speaker is connected by a BG wire to the LH rear door low range speaker. A second BG wire connects the negative output connection of the LH rear door low range speaker to connector interface C0435-2/C0803-2. From the interface the negative output is connected by an SO wire to the power amplifier. From the power amplifier the negative output is connected by a P wire to connector interface C0229-25/C0067-25 then by a BO wire to the head unit.

Tail door speakers
The power amplifier is connected to tail door low range speaker 1 on a KB wire. From tail door low range speaker 1 the connection returns on an RB wire to the power amplifier.

The power amplifier is connected to tail door low range speaker 2 on an NB wire. From tail door low range speaker 2 the connection returns on a WB wire to the power amplifier.