Land Rover Discovery 99my To 03my Electrical Library 3rd Edition Rover Manual

							DESCRIPTION AND OPERATION
4.150DISCOVERY SERIES II
LH front door speaker
The positive output from the head unit is connected on a BW wire to connector interface 
C0463-3/C0744-3. From the interface the positive output continues on a BK wire to the LH 
front door speaker. The LH front door speaker negative output is connected on a BR wire to 
connector interface C0463-4/C0744-4. From this interface the negative output is connected 
on a BN wire to the head unit.
LH high range A post speaker (Mid-line model only)
From connector interface C0463-3/C0744-3 the positive output continues on a BW wire to 
connector interface C0483-16/C0101-16, then from the interface on a YK wire to the LH high 
range A post speaker. The LH high range A post speaker negative output is connected on 
a YB wire to connector interface C0101-15/C0483-15, then from the connector interface on 
a BN wire to connector interface C0463-4/C0744-4.
LH rear door speaker
The positive output from the head unit is connected on a BY wire to connector interface 
C0435-1/C0803-1. From this interface the positive output continues on a BU wire to the LH 
rear door speaker. The LH rear door speaker negative output is connected on a BG wire to 
connector interface C0435-2/C0803-2. From this interface the negative output is connected 
on a BO wire to the head unit.
Remote controls (Mid-line model only)
The remote control inputs are connected to the head unit via the rotary coupler with an SB 
wire. The remote control output is connected to the head unit by an SR wire via the rotary 
coupler.
High-Line In-Car Entertainment Description
The high-line in-car entertainment system consists of a head unit, located in the centre of 
the fascia, a power amplifier located under the LH front seat and a CD autochanger located 
under the RH front seat. Radio headphone amplifiers are located in the lower rear quarter 
trim casing. Remote controls are located on the LH side of the steering wheel. The high line 
system has:
zA high range speaker located in each A post trim
zA low and mid range speaker located in the front doors
zA low and a high range speaker located in the rear doors
zLow range speakers located in a housing on the tail door
zAn AM/FM aerial mounted on the RH rear side window and an FM aerial mounted on 
the LH side window. The LH aerial is used for improved FM reception in urban areas.
The system can be controlled from the head unit, the remote controls on the steering wheel, 
or the radio headphone amplifiers. The driver’s selection via the head unit or remote controls 
has priority over the radio headphone amplifier’s control selections. 
						

							DESCRIPTION AND OPERATION
DISCOVERY SERIES II 4.151
In-Car Entertainment (ICE) High-Line System Supply
Circuit supply
A permanent feed from the battery positive terminal is connected by an R wire to the engine 
compartment fusebox, where it passes through fusible link 3. From fusible link 3 the feed 
passes on an NR wire to fuse 20 in the passenger compartment fusebox. From fuse 20 the 
feed flows on a P wire via header C0725 to the head unit. This feed supplies power to the 
internal memory and the power switch on the head unit.
A feed for illumination passes through fusible link 13 in the engine compartment fusebox and 
on an NG wire to the lighting switch. From the lighting switch the feed passes on an R wire 
to fuse 33 in the passenger compartment fusebox. The feed from fuse 33 is connected to 
header C0759 by an RO wire. After passing through two links on header C0759, one on an 
RO wire and one on an RN wire, the feed is connected to the head unit on an RN wire.
The permanent feed to the engine compartment fusebox is also connected in series through 
fusible links 1 and 7. From fusible link 7 the feed is connected to the contacts of the auxiliary 
circuits relay.
A permanent feed from fusible link 7 in the engine compartment fusebox is connected to fuse 
17 in the passenger compartment fusebox on a PG wire. From fuse 17 the feed is connected 
to the power amplifier by a LGP wire.
NOTE: This feed is operational when enabled by a signal from the head unit.
Another connection inside the engine compartment fusebox connects fusible link 8 to the 
permanent supply. From fusible link 8 the feed is connected to the passenger compartment 
fusebox on an NW wire. From the passenger compartment fusebox the feed flows to the 
ignition switch on an N wire.
Ignition switch supply
When the ignition switch is in position II, the feed from fusible link 8 in the engine 
compartment fusebox flows on an LGW wire to fuse 26 in the passenger compartment 
fusebox.
From fuse 26 the feed is connected on an LG wire to the coil of the auxiliary circuits relay. 
The coil of the auxiliary circuits relay is earthed via header C0286 LHD/C0288 RHD to earth 
header C0018 on a B wire.
When the ignition switch is in position II the coil of the auxiliary relay is energised closing the 
relay contacts. 
						

							DESCRIPTION AND OPERATION
4.152DISCOVERY SERIES II
The feed from the contacts of the auxiliary relay flows on a WG wire to fuse 16 in the 
passenger compartment fusebox. From fuse 16 a feed on an LGO wire flows to header 
C0296. From header C0296 the feed flows on a LGO wire to the LH and RH radio 
headphone amplifiers.
NOTE: This feed is operational when enabled by a signal from the head unit.
Another feed from fuse 16 in the passenger compartment fusebox is connected via splice 
joint A7 to the head unit on an LGP wire. This feed supplies the power to the head unit on/
off switch and glowring illumination.
A feed from the head unit is connected via header C0285 LHD/C0761 RHD to the power 
amplifier and header C0296 on RU wires. From header C0296 RU wires connect the feed 
to the LH and RH aerial amplifiers, and the LH and RH radio headphone amplifiers.
NOTE: This feed is the power supply to the aerial amplifiers and forms the system enable 
output from the head unit to the radio headphone amplifiers and the power amplifier. This 
feed is on as long as the head unit is switched on.
In-Car Entertainment High-Line System Operation
Head unit
When the power switch on the head unit is turned on, the internal power supply circuits are 
energised. Enable signals are sent from the head unit to the radio headphone amplifiers and 
the power amplifier. The CD autochanger also receives an enable signal. The head unit is 
connected by a B wire to earth point C0361-1.
Spatial imaging enable
The head unit spatial imaging enable output is connected from the head unit to the power 
amplifier on an SG wire.
RH low range rear door speaker
The positive output from the head unit is connected on a BG wire to connector interface 
C0229-18/C0067-18. From the interface the positive output continues on a R wire to the 
power amplifier. From the power amplifier the positive output continues on a SR wire to 
connector interface C0436-1/C0803-1. From this interface the feed continues on a BU wire 
to the low range RH rear door speaker.
The RH low range rear door speaker negative output is connected on a BG wire to connector 
interface C0436-2/C0803-2. From this interface the negative output is connected on a SP 
wire to the power amplifier. From the power amplifier the negative output is connected on a 
W wire to connector interface C0229-19/C0067-19. From this interface the feed continues 
on a BU wire to the head unit. 
						

							DESCRIPTION AND OPERATION
DISCOVERY SERIES II 4.153
RH rear door high range speaker (upper door trim)
The positive output from the RH rear door speaker continues on to the RH rear door high 
range speaker on a BU wire. The negative output from the RH rear door high range speaker 
is connected on a BG wire to the negative output connector on the RH rear door speaker.
RH mid range front door speaker
The positive output from the head unit is connected on a BK wire to connector interface 
C0229-20/C0067-20. From the interface the positive output continues on a G wire to the 
power amplifier. From the power amplifier the positive output continues on a KB wire to 
connector interface C0463-2/C0744-2 LHD or C0459-2/C0744-2 RHD. From this interface 
the output continues on a KB wire to the RH front mid range door speaker.
The RH front mid range door speaker negative output is connected on a RB wire to 
connector interface C0463-1/C0744-1 LHD or C0459-1/C0744-1 RHD. From this interface 
the negative output is connected on a RB wire to the power amplifier. From the power 
amplifier the negative output is connected on a S wire to connector interface C0229-21/
C0067-21 LHD or C0229-21/C0067-21 RHD. From this interface the feed continues on a BR 
wire to the head unit.
RH high range A post speaker
From connector interface C0463-2/C0744-2 LHD or C0459-2/C0744-2 RHD the positive 
output continues on a KB wire to the RH high range A post speaker. The RH high range A 
post speaker negative output is connected on a RB wire to connector interface C0463-1/
C0744-1 LHD or C0459-1/C0744-1 RHD.
LH mid range front door speaker
The positive output from the head unit is connected on a BW wire to connector interface 
C0229-22/C0067-22. From the interface the positive output continues on a Y wire 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. From this interface 
the feed continues on a RB wire to the LH front door mid range speaker.
The LH front door mid range speaker negative output is connected on a KB wire to connector 
interface C0459-2/C0744-2 LHD or C0463-2/C0744-2 RHD. From this interface the negative 
output is connected on a YK wire to the power amplifier. From the power amplifier the 
negative output is connected on an O wire to connector interface C0229-23/C0067-23. From 
this interface the feed continues on a BN wire to the head unit.
LH high range A post speaker
From connector interface C0459-1/C0744-1 LHD or C0463-1/C0744-1 RHD, the positive 
output continues on a YB wire to the LH high range A-post speaker. The LH high range A 
post speaker negative output is connected on a YK wire to connector interface C0459-2/
C0744-2 LHD or C0463-2/C0744-2 RHD. 
						

							DESCRIPTION AND OPERATION
4.154DISCOVERY SERIES II
LH low range rear door speaker
The positive output from the head unit is connected on a BY wire to connector interface 
C0229-24/C0067-24, from the interface the positive output continues on a U wire to the 
power amplifier. From the power amplifier the positive output continues on a SK wire to 
connector interface C0435-1/C0803-1. From this interface the feed continues on a BU wire 
to the LH low range rear door speaker.
The LH low range rear door speaker negative output is connected on a BG wire to connector 
interface C0435-2/C0803-2. From this interface the negative output is connected on a SO 
wire to the power amplifier. From the power amplifier the negative output is connected on a 
P wire to connector interface C0229-25/C0067-25. From this interface the feed continues on 
a BO wire to the head unit.
LH rear door high range speaker (upper door trim)
The positive output from the LH rear door speaker continues on to the LH rear door high 
range speaker on a BU wire. The negative output from the LH rear door high range speaker 
is connected on a BG wire to the negative output connector on the LH rear door speaker.
Low range tail door speakers
The power amplifier is connected to the low range tail door speaker 1 on a KB wire. From 
the low range tail door speaker 1 the connection returns on a RB wire to the power amplifier.
The power amplifier is connected to the low range tail door speaker 2 on a NB wire. From 
the low range tail door speaker 2 the connection returns on a WB wire to the power amplifier.
LH low range front door speaker
The power amplifier is connected on a KG wire to connector interface C0459-3/C0744-3. 
From this interface the connection continues on a BK wire to the low range LH front door 
speaker. The connection from the low range LH front door speaker returns on a BR wire to 
connector interface C0459-4/C0744-4. From this interface the connection continues on an 
OK LHD/KR RHD wire to the power amplifier.
RH low range front door speaker
The power amplifier is connected on a OB wire to connector interface C0463-3/C0744-3. 
From this interface the connection continues on a BK wire to the low range RH front door 
speaker. The connection from the low range RH front door speaker returns on a BR wire to 
connector interface C0463-4/C0744-4. From this interface the connection continues on a KR 
LHD/OK RHD wire to the power amplifier. 
						

							DESCRIPTION AND OPERATION
DISCOVERY SERIES II 4.155
Remote controls (steering wheel)
The remote control output is connected to the head unit by an SR wire via the rotary coupler. 
The remote control inputs are connected to the head unit via the rotary coupler with an SB 
wire.
Radio headphone amplifiers
Radio headphone earth: The radio headphone amplifiers are connected via header C0296 
to earth header C0707 on a B wire.
Left channel input/output: The positive left channel output from the head unit is connected 
on a R wire to the LH and RH radio headphone amplifiers. The negative output from the left 
channel of the LH and RH radio headphone amplifiers is connected on a W wire to the head 
unit.
Right channel input/output: The positive right channel output from the head unit is connected 
on a U wire to the LH and RH radio headphone amplifiers. The negative output from the right 
channel of the LH and RH radio headphone amplifiers is connected on a P wire to the head 
unit.
Radio headphone remote control input/output: The radio headphones remote control feed 
from the head unit is connected to header C0296 on a Y wire. From header C0296 the feed 
continues on Y wires to the LH and RH radio headphone amplifiers. The remote control input 
from the LH radio headphone amplifier is connected on an G wire to the head unit. The 
remote control input from the RH radio headphone amplifier is connected on an S wire to the 
head unit.
Radio headphone active input: Both of the radio headphone amplifiers are connected to 
header C0296 on O wires. From header C0296 the input continues on a O wire to the head 
unit.
Power amplifier - road speed connection
The power amplifier receives a road speed signal, for automatic volume control, on a KG 
wire connected to the Self Levelling and Anti-lock Braking System (SLABS) ECU via header 
C0290.
Power amplifier - earth connection
The power amplifier is connected to earth header C0708 by a B wire. 
						

							DESCRIPTION AND OPERATION
4.156DISCOVERY SERIES II
CD autochanger connections
The CD autochanger is earthed, via the head unit, on an N wire from the CD autochanger 
to connector interface C0912-8/C0911-8, and a B wire from the interface to the head unit.
An I bus communications link is connected from the CD autochanger to connector interface 
C0912-5/C0911-5 on a G wire, and from the interface to the head unit on a K wire.
The CD auto changer permanent feed is connected from the head unit on a P wire.
The CD autochanger left channel positive input is connected to the head unit by a R wire. 
The left channel negative input is connected to the head unit on a S wire.
The CD autochanger right channel positive input is connected to the head unit by a W wire. 
The right channel negative input is connected to the head unit on a B wire from the CD 
autochanger to connector interface C0912-2/C0911-2, and a U wire from the interface to the 
head unit.
In-Car Entertainment/Satellite Navigation Description
The In-Car Entertainment (ICE)/satellite navigation system consists of the an ICE system 
with a navigation computer, integrated into the audio system head unit, and an additional 
aerial. The additional aerial is installed on the roof centreline above the tail door and receives 
Global Positioning System (GPS) satellite radio signals, which are relayed to the head unit 
on a dedicated co-axial cable. The satellite navigation function provides audio and visual 
route guidance to help the driver reach a selected destination. In addition to satellite 
navigation, the head unit incorporates a Compact Disc (CD) player and an AM/FM radio.
The head unit is located in the centre of the fascia. A power amplifier is located under the 
LH front seat and a CD autochanger is located under the RH front seat. Remote controls are 
located on the LH side of the steering wheel and connected to the head unit via an interface 
module. The system also has:
zA high range speaker located in each A post trim
zA low and mid range speaker located in the front doors
zA low and a high range speaker located in the rear doors
zLow range speakers located in a housing on the tail door
zAn AM/FM radio aerial, mounted on the RH rear side window, and an aerial amplifier 
to boost signal strength
The satellite navigation functions are controlled from the head unit. The radio and CD 
functions can be controlled from the head unit or the remote controls. 
						

							DESCRIPTION AND OPERATION
DISCOVERY SERIES II 4.157
ICE/Satellite Navigation Supply
Circuit supply
A permanent feed from the battery positive terminal is connected by an R wire to the engine 
compartment fusebox, where it passes through fusible link 3. From fusible link 3 the feed 
passes on an NR wire to fuse 20 in the passenger compartment fusebox. From fuse 20 the 
feed flows on a P wire via header C0725 to the head unit and the CD autochanger. The 
permanent feed to the head unit powers the internal memory. The permanent feed to the CD 
autochanger allows the CD magazine to be changed with the ignition off.
The head unit is earthed by two B wires from the head unit to splice A22/A190, and a B wire 
from the splice to earth point C0361-1. The CD autochanger is earthed by an N wire to 
connector interface C0912-8/C0911-8, then a B wire to earth point C0361-1 via splice A22/
A190.
A feed for illumination passes through fusible link 13 in the engine compartment fusebox and 
on an NG wire to the lighting switch. When the side lamps or head lamps are selected on, 
the feed passes from the lighting switch to fuse 33 in the passenger compartment fusebox 
on an R wire. Fuse 33 is connected to header C0759 by an RO wire. After passing through 
two links on header C0759, one on an RO wire and one on an RN wire, the feed is connected 
to the head unit on an RN wire.
The permanent feed to the engine compartment fusebox is also connected in series through 
fusible links 1 and 7. From fusible link 7 the feed is connected to the contacts of the auxiliary 
circuits relay.
A feed from fusible link 7 in the engine compartment fusebox is also connected to fuse 17 in 
the passenger compartment fusebox on a PG wire. From fuse 17 the feed is connected to 
the power amplifier by a LGP wire. The power amplifier is connected to earth header C0708 
by a B wire.
Fusible link 8 in the engine compartment fusebox is also connected to the permanent supply. 
From fusible link 8 a feed is connected to the passenger compartment fusebox on an NW 
wire. From the passenger compartment fusebox the feed flows to the ignition switch on an 
N wire. 
						

							DESCRIPTION AND OPERATION
4.158DISCOVERY SERIES II
Ignition switch supply
When the ignition switch is in position I or II, the feed from fusible link 8 in the engine 
compartment fusebox flows from the ignition switch to fuse 26 in the passenger 
compartment fusebox on an LGW wire. From fuse 26 the feed is connected on an LG wire 
to the coil of the auxiliary circuits relay, which is connected via header C0286 LHD/C0288 
RHD to earth header C0018 on a B wire. The auxiliary circuits relay is energised, closing the 
relay contacts.
From the closed contacts of the auxiliary circuits relay, a feed flows on a WG wire to fuse 16 
in the passenger compartment fusebox. From fuse 16, a feed is connected to the aerial 
amplifier by an LGO wire. A second feed from fuse 16 supplies power to the on/off switch of 
the head unit and to the interface module, via splice A47/A194, on an LGP wire. The 
interface module is earthed on a B wire to earth point C0361-1 via splice A22/A190.
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 power feed 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. 
						

							DESCRIPTION AND OPERATION
DISCOVERY SERIES II 4.159
CD autochanger 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.