LR3/Disco 3
HEAD UNITS
The audio systems has two levels of head unit. A low line and high line unit. The low line unit system is based around a
head unit which communicates on the medium speed CAN (controller area network) bus while the High line system is
based around an Integrated Head Unit (IHU) which communicates on the Media Orientated System Transport (MOST)
ring and the medium speed CAN (controller area network) bus.
LOW LINE AUDIO HEAD UNIT
The low line Head Unit (HU) contains the following functionality:
Radio tuner
Single disc CD (compact disc) player
Amplifier
The HU communicates with other vehicle systems on the CAN (controller area network) bus.
Connector C1354 Pinout Table For Low Line Head Unit
11
-
Audio amplifier
12
-
SDARS/telephone antenna roof mounted pod
13
-
Speakers
14
-
Side screen antenna diversity amplifier
15
-
Side screen AM (amplitude modulation) /FM (frequency modulation) antenna
16
-
Rear screen antennas
17
-
Rear screen antenna amplifier
18
-
Audio/video input/output panel
19
-
Fuse 53p
20
Fuseable link 18E
Pin No
Description
Input/Output
1
Power ground
-
2
3
Speaker rear LH (left-hand) +
Output
4
Speaker rear LH (left-hand) -
-
5
Speaker rear RH (right-hand) +
Output
6
Speaker rear RH (right-hand) -
-
7
Steering wheel controls signal
Input
8
Not used
-
9
CAN (controller area network) in +
Input
