Discovery 2. Manual — part 772
NAVIGATION SYSTEM
DESCRIPTION AND OPERATION
87-9
Steering Wheel Switches
The steering wheel switches provide remote control operation for some of the navigation computer functions. The
switches can be used to select between the radio/CD/navigation modes, to adjust the volume (in all modes) and to
select search/preset up/down for radio and CD operation.
Remote Control Interface Unit
The remote control interface unit converts the analogue signals from the steering wheel switches into digital signals
for use by the navigation computer. The remote control interface unit is installed in a bracket immediately below the
navigation computer.
The radio remote switches form a resistance ladder between two wires with the resistance across wires dependent
on which switch is pressed. The remote control interface unit monitors the two wires and converts their input into
Instrument (I) bus protocol messages, which it outputs on a dedicated serial link to the navigation computer.
NAVIGATION SYSTEM
87-10
DESCRIPTION AND OPERATION
NAVIGATION SYSTEM
REPAIRS
87-11
REPAIRS
Interface electronic control unit (ECU) -
remote control
$% 86.53.15
Remove
1. Remove navigation display unit.
2. Remove automatic temperature control unit.
AIR CONDITIONING, REPAIRS, ECU
3. Remove 2 nuts securing interface carrier
bracket, carefully pull bracket out of fascia.
4. Release interface ECU from bracket,
disconnect multiplug and remove ECU.
Refit
1. Secure interface ECU in bracket and connect
multiplug.
2. Carefully position carrier bracket in fascia,
secure with nuts and tighten to 10 Nm (7 lbf.ft).
3. Fit automatic temperature control unit.
AIR CONDITIONING, REPAIRS, ECU
4. Fit navigation display unit.
M86 5760
M86 5762
NAVIGATION SYSTEM
87-12
REPAIRS
Display unit
$% 86.53.20
Remove
1. Fit tool LRT-86-009 into slots ensuring correct
handed key is in correct slot.
The tools are stamped either 'TOP L' or 'TOP
R', ensure the stamping is facing upwards
when removing the unit.
2. Pull display unit from fascia.
3. Disconnect 3 multiplugs and 2 coax cables
from display unit and remove unit.
4. Push display unit retaining clips inwards and
remove keys.
Refit
1. Position display unit to fascia, connect
multiplugs and coax cables.
2. Push display unit into fascia until retaining clips
engage.
3. Enter security code and check system is
operational.
M86 5824
M86 5825
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