Range Rover 2. Electrical Manual — part 179
RADIO
E6
CIRCUIT OPERATION
1
REV: 09/2001
CIRCUIT OPERATION
Battery Voltage is provided to the radio at all times
through the P wire. In addition to the anti–theft
feature, this input voltage keeps the preset station
memory alive. Whenever battery power to the unit is
lost, the anti–theft code must be entered and the
preset stations must be reprogrammed (if enabled).
When the Radio (Z111) and the igntion are turned
on, the voltage signal through the WK wire to the
control head ‘wakes up’ the unit. The Radio (Z111)
plays, the LCD display comes on and the control
buttons illuminate. On some models, when the park
lamps or headlamps are turned on, a voltage signal
is sent through the RW wire to dim the LCD display
and control buttons for night driving.
Radio (Z111) signals are received via a coaxial cable
from the side screens and antenna amplifiers. The
amplifiers filter and boost the signal from the side
screen, using power supplied on WO wires,
whenever the ignition switch (X274) is in position I or
II.
The CD Changer (Z114) is permanently supplied
with power through the P wire via the radio and a
DIN cable.
The high line (NAS/JAPAN) radio has the following
features: Electronically tuned AM/FM cassette radio
(Z111), RH antenna amplifier (Z178) for AM/FM
signals, LH antenna amplifier (Z177) for FM signals
only, a subwoofer amplifier (Z176), a CD changer
(Z114) a Digital Signal Processor (DSP) amplifier
(Z293) and 10 speakers plus a subwoofer speaker
(K146).
Subwoofer
The subwoofer amplifies frequencies between 20
and 150 Hz to give an enhanced bass sound.
Subwoofer Amplifier
The subwoofer (K146) is supplied with power and
ground from the Subwoofer Amplifier (Z176) via two
separate channels which consist of 4 BW/B wires.
The subwoofer amplifier (Z176) is permanently
switched on when the radio supplies a signal on the
SB wire.
Speaker Amplifier
The DSP amplifier (Z293) is located behind the LH
rear luggage compartment behind the subwoofer.
The DSP amplifier (Z293) now incorporates the door
amplifiers which are no longer fitted separately.
Navigation information is supplied to the DSP
amplifier (Z293) which outputs the information to the
relevant speaker(s).
RADIO
E6
CIRCUIT OPERATION
2
REV: 09/2001
Side Screen Antenna
The antenna is printed into the rear side screen. For
NAS and Japan, the element is fitted in both rear
side screens. This is referred to as a diversity
antenna system. Other markets have a single
element in the right hand screen only. Diversity
reception means that as vehicle movement results in
loss of signal due to reflections from buildings
(known as multipath distortion), the radio will switch
to the antenna receiving the strongest signal. This
results in less interference and better stereo
performance.
Antenna Amplifier
Antenna amplifiers are in the LH and RH side of the
luggage compartment behind trim panel.The FM and
AM amplifier would be located on the RH side, and
the FM only amplifier is located on the LH side.
Speakers
Trim level 1/2 – The low/midline radio is equipped
with 6, 8 or 10 speakers fitted in the doors. The
midrange speakers (K200, K201, K211, K212) are
filtered by capacitors in the wires (K239, K240,
K247, K248) and the tweeter speakers (K197, K198)
filter the signals by built–in capacitors.
Trim level 3/4 – the high line radio is equipped with
10 speakers. The signals for the tweeter speakers
(K197, K198) are filtered by their internal capacitors,
similar to the mid/low line tweeters.
RADIO (LOW LINE)
E6
3
CIRCUIT DIAGRAM
REV: 11/99
See Ground
Distribution
S209
B
4
6
7
C0098
S210
S212
Z111
Radio
S205
See Fuse Details
6
C1276
2
7
30
F 1
10 A
RW
WK
P
30
F 8
30 A
Z238
Body Electrical
Control Module
(BECM)
Low Line Radio
RL 7
S208
Interior Lamps
Heating and
Ventilation
2
C0921
B
E0361
8
C0098
5
C0098
7
C1377
5
C1571
E0562
Z181
Right Side
Window Antenna
Z178
Right Antenna
Amplifier
Z111
Radio
SB
SB
Not used
C1423
C0022
2
(MY 2000)
Radio
(MY 1999)
C0921
C1424
C1570 (MY 2000)
(MY 1999)
(MY 1999)
(MY 2000)
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