fuse LAND ROVER DISCOVERY 1999 Workshop Manual

HARNESSES
REPAIRS 86-7-31
17.Disconnect DVD main harness multiplug from
vehicle fuse box link harness.
18.Remove DVD main harness from above
headlining and from fascia.
Refit
1.Fit DVD main harness to fascia and above
headlining.
2.Connect DVD main harness multiplug to
vehicle fuse box link harness.
3.Secure harness behind clamps at 'A' post and
multiplug to DVD unit mounting bracket.
4.Fit upper finisher to 'B' post.
5.Fit 'A' post lower finisher and secure with
fixings.
6.Fit seals to front and rear door apertures.
7.Fit screws to secure stowage pocket.
8.Position sun visor and connect multiplug.
9.Fit sun visor and secure with screws.
10.Fit finisher securing clips to 'A' post.
11.Position 'A' post upper finisher and connect
tweeter multiplug.
12.Fit 'A' post upper finisher.
13.Fit grab handles, tighten screws and fit screw
covers.
14.Fit DVD player unit.

+ IN CAR ENTERTAINMENT,
REPAIRS, DVD screen/player unit.
15.Fit CD switch box.

+ IN CAR ENTERTAINMENT,
REPAIRS, Switch box - CD/DVD player.
16.Connect battery earth lead, fit and secure
battery cover.

HARNESSES
86-7-32 REPAIRS
Harness - link - CD/DVD switch box
$% 86.70.26
Remove
1.Remove battery cover and disconnect the
battery earth lead.
2.Remove centre console.

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Console - centre - automatic
models.
3.Remove 3 fasteners and release drivers side
lower closing panel.
4.Release diagnostic socket and remove closing
panel.
5.Rotate turnbuckles and lower fuse box access
panel.6.Disconnect 2 CD switch box link harness
multiplugs from vehicle main harness.
7.Disconnect link harness multiplug from CD
switch box.
8.Remove 3 cable ties securing CD switch box
link harness to fascia support bracket and
remove harness.
Refit
1.Fit CD switch box link harness and connect
multiplugs to vehicle main harness.
2.Connect link harness multiplug to CD switch
box.
3.Align CD switch box link harness to fascia
support bracket and secure with cable ties.
4.Close and secure fuse box access panel.
5.Position fascia closing panel and fit diagnostic
socket.
6.Fit closing panel and secure with fasteners.
7.Fit centre console.

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Console - centre - automatic
models.
8.Connect battery earth lead, fit and secure
battery cover.
M86 6027

DRIVING AIDS
DESCRIPTION AND OPERATION 86-8-3
1PDC sounder
2PDC switch
3Fusible link
4Ignition switch
5Fuse
6PDC ECU
7PDC sensors

NAVIGATION SYSTEM
87-4 DESCRIPTION AND OPERATION

Inputs and Outputs
In addition to the vehicle sensor and the antenna inputs, the navigation computer also receives the following:
lA permanent battery feed from the passenger compartment fusebox, to power the navigation function.
lAn ignition switched battery feed from the passenger compartment fusebox, to power the navigation, radio and
CD functions when the ignition switch is in positions I and II.
lAn illumination power feed for switch illumination and LCD backlighting when the exterior lights are on.
Navigation computer outputs consist of those for the ICE system speakers and to the auxiliary CD autochanger, where
fitted.
Security Code
The navigation computer is programmed with a five digit security code selected from numbers 1 to 7. If the battery or
the navigation computer are disconnected, the code is requested on the LCD the first time the navigation computer
is switched on after reconnection; this also occurs if a different removable panel is fitted.
The code is entered using the appropriate multifunction buttons. The navigation computer automatically starts to
operate when the fifth digit of the correct code is entered. If an incorrect code is entered, CODE is displayed on the
LCD to prompt another entry attempt. If an incorrect code is entered three times in succession, WAIT is displayed on
the LCD and the unit is disabled for approximately 60 minutes. If the navigation computer is switched off, the
remaining disabled time will resume when the power is restored.
Automatic Volume Control (AVC)
The AVC feature automatically increases and decreases the audio volume with increases and decreases of vehicle
road speed. The AVC feature, also known as the GAL setting, uses the vehicle speed signal from the ABS ECU and
can be turned off or adjusted to start at a different vehicle speed. The GAL setting is accessed through the User Menu
and can be set to between 0 and +15, where 0 is off and +1 to +15 progressively increase the vehicle speed at which
AVC starts to operate.

INSTRUMENTS
DESCRIPTION AND OPERATION 88-9
Fuel gauge
The fuel gauge is an analogue gauge that indicates the level of fuel in the fuel tank with the ignition on. The fuel gauge
returns to 0 with ignition off. The gauge reading is proportional to the level of fuel in the tank. It is a damped action
gauge to prevent erroneous readings caused by fuel moving in the tank. The damping action is minimised when the
ignition is switched on to give an accurate reading within 2.5 seconds.
The signal input for the fuel gauge is from the tank sender unit, it is a variable voltage signal proportional to the level
of fuel in the tank. The instrument pack provides the power via fuse 27 to the fuel gauge, then from the gauge on to
the fuel tank sender unit. The earth path return circuit of the sender unit is connected to the instrument pack.
A low fuel level signal is provided for the ECM when the sender resistance is greater than 158±8 ohms, this is used
to create a fault code indicating low fuel level during misfire diagnosis using TestBook.

INSTRUMENTS
DESCRIPTION AND OPERATION 88-11
Engine coolant temperature gauge
The engine coolant temperature gauge is an analogue gauge with three sections: cold temperature; normal operating
temperature; high temperature. Under normal engine operating temperatures the engine coolant temperature gauge
will display in the centre of the gauge. When the engine is cold e.g. from first start-up, the coolant temperature gauge
will display in the cold band. When the engine is over heating the temperature gauge will display in the high
temperature band. If the engine coolant temperature gauge receives no input or the input is out of range the
temperature gauge will read cold and the high coolant temperature warning lamp will be illuminated.
The input signal is a PWM signal from the engine coolant temperature sensor via the ECM. The power input for the
high coolant temperature warning lamp is supplied by the instrument pack via fuse 27. The ECM controls the earth
path to illuminate the high coolant temperature warning lamp.

INSTRUMENTS
88-12 DESCRIPTION AND OPERATION
Malfunction Indicator Lamp (MIL)/ SERVICE ENGINE SOON warning lamp
The MIL/service engine soon warning lamp within the instrument pack utilises an amber LED and a clear legend. If
an emission related fault is detected by the engine management system or, on automatic gearbox models, the EAT
ECU, the ECM will illuminate the LED providing the driver with a visible warning.
The warning lamp will illuminate whenever the vehicle is driven until the fault is repaired, and the ECM fault code
memory is cleared using TestBook.
When the ignition is switch on the ECM carries out a self-test function of the lamp. The lamp will illuminate for 3
seconds then extinguish if no faults exist. If a fault is present the lamp will be extinguished for 1 second before
illuminating again to indicate a fault exists.
There are two configurations of the legend for the warning lamp:
lNAS and Canada = SERVICE ENGINE SOON text.
lAll other markets = MIL SAE J1930 symbol.
The power input for the LED is supplied by the instrument pack via fuse 27. The ECM provides a voltage to the
instrument pack Central Processing Unit (CPU) to control the warning lamp:
l< 1.8 volts = warning lamp on.
l> 7.7 volts = warning lamp off.

INSTRUMENTS
88-16 DESCRIPTION AND OPERATION
Direction indicator warning lamps
The direction indicator warning lamp within the instrument pack utilises a green LED and a clear legend. The LED
flashes at the same rate as the external indicators, providing the driver with a visible warning.
Operating the left-hand indicator switch instructs the BCU to activate the left-hand indicator warning lamp.
Operating the right indicator switch instructs the BCU to activate the right-hand indicator warning lamp.
There is no self-test performed at ignition on for these warning lamps.
The power input for the LED is supplied by the instrument pack via fuse 27. The earth path for the warning lamps is
from the BCU.

INSTRUMENTS
88-18 DESCRIPTION AND OPERATION
Anti-lock Brake System (ABS) warning lamp
The ABS warning lamp within the instrument pack utilises an amber LED with a clear legend. If a fault within the ABS
is detected, the SLABS ECU illuminates the LED, providing the driver with a visible warning.
When the ignition is switched on, the SLABS ECU illuminates the LED to provide a self-check, providing there is no
fault it will remain illuminated for 3 seconds or until the ignition is switched off. If an ABS fault is detected while driving
the warning lamp will illuminate to alert the driver.
The power input for the LED is supplied by the instrument pack via fuse 27. The SLABS ECU provides the earth path
to illuminate the ABS warning lamp.

INSTRUMENTS
DESCRIPTION AND OPERATION 88-19
High engine coolant temperature warning lamp
The high engine coolant temperature warning lamp within the instrument pack utilises a red LED and a clear legend.
The ECM illuminates the LED when it detects the engine coolant has exceeded a temperature of 121 °C (250 °F) and
switches it off when the coolant temperature drops below 118 °C (244 °F). The ECM also illuminates the high engine
coolant temperature warning lamp when it detects the PWM duty cycle to the temperature gauge is out of range. If it
is greater than 94% duty cycle when the engine is hot, or less than 8% duty cycle when the engine is cold, the engine
coolant temperature gauge pointer will indicate cold, thus alerting the driver with an additional visible warning.
When the ignition is switched on, the ECM illuminates the LED to provide a self-check, providing there is no fault it
will remain illuminated for 3 seconds or until the ignition is switched off.
The response of the engine high temperature warning lamp varies according to engine type and market, there are
three conditions:
lV8 - Gulf.
lV8 - all markets except Gulf.
lDiesel - all markets.
The vehicle configuration determines which condition is set.
The PWM duty cycle thresholds for illuminating and extinguishing the warning lamp are given in the table below.
The power input for the LED is supplied by the instrument pack via fuse 27. The ECM controls the earth path to
illuminate the warning lamp.
Market Lamp on Lamp off
V8 - Gulf 79.8 ± 2% 77.8 ± 2%
V8 - all markets except Gulf 77.8 ± 2% 75.7 ± 2%
Diesel - all markets 78.8 ± 2% 76.8 ± 2%