Defender Electric Diagrams. Manual - part 175

FIBRE OPTICS 

General 

The fibre optic system installed uses Media Oriented Systems Transport (MOST), which is a multimedia 
network, optimized for automotive applications. Its design allows it to provide a low-overhead and low-cost 
interface for the simplest of devices, such as microphones and speakers. More intelligent devices can 
automatically determine the features and functions provided by all other devices on the network and establish 
sophisticated control mechanisms without distracting the driver.  

Under normal installation conditions the system is robust and failures should not occur. However, since the 
optical fibres convey data using infra-red light, it is vital the passage of light down the fibre is unobstructed. 
Obstruction of infra-red light can be caused by:  

z

Contamination of the fibre ends.  

z

Damage to the fibre ends.  

z

Bending, kinking or damaging the cable.  

NOTE: Fibres damaged by kinking or exposure of the optical core due to abrasion must be replaced. 

 

Handling 

Take special care to avoid damage or contamination when handling or working in the vicinity of fibre optic 
cables and connectors.  

NOTE: Damage or contamination includes scratches to the cable ends and pollution caused by dust, 
dirt, oil or moisture. 

 

CAUTION: When handling fibre optic cables cleanliness is of paramount importance. The fibre ends 
should not be touched even with clean bare hands as the natural oils deposited from the skin may 
penetrate the fibre or may cause dirt to adhere to the fibre end. 

 

System malfunctions and unnecessary warranty claims can be minimised by following these guidelines:  

z

After disconnection of any cables, carefully install appropriate dust caps to protect the mating faces of 
the connectors from damage or contamination.  

z

Avoid introducing tight bends (less than 30mm radius) or kinks into the fibre optic cable during service 
or repair. Tight bends or kinks could impair operation, cause immediate system failure, or future system 
failure.  

z

Avoid excessive force, strain or stress on the fibres and connectors, especially permanent stress after 
reinstallation.  

TABLE OF CIRCUIT OPTION CODES 

The following table contains a list of circuit (Cct) reference numbers against a description of the applicable 
model or option. This information should be used in conjunction with the connector pin-out tables to determine 
the wire configuration of the vehicle under test.  

Cct 

Model or Option 

1

ABS

2

ABS + TRACTION CONTROL

3

2 DOOR

4

3 DOOR

5

4 DOOR

6

4/5 DOOR

7

5 DOOR

8

HEAD/SIDE LAMPS + 
HEADLAMP LEVEL

9

ABS LH

10

ABS RH

11

WINDOW LIFT DOORS

14

AIRCON

14L

AIRCON

14R

AIRCON

22

ANTI-THEFT ALARM

22L

ANTI-THEFT ALARM

22R

ANTI-THEFT ALARM

95L

WIPERS & WASHERS

95R

WIPERS & WASHERS

HEADLAMP LEVEL 

107

(MANUAL)

107L

HEADLAMP LEVEL 
(MANUAL)

107R

HEADLAMP LEVEL 
(MANUAL)

109R

HEATED FRONT SCREEN

109L

HEATED FRONT SCREEN

139L

LHD VEHICLES

192

REAR SPEAKERS

200R

RHD VEHICLES

247L

WINDOW LIFT

247R

WINDOW LIFT

248

WINDOW LIFT FRONT

254

ENGINE MANAGEMENT 
DIESEL

254R

ENGINE MANAGEMENT 
DIESEL

254L

ENGINE MANAGEMENT 
DIESEL

499

LEGACY ALL CCT

765R

DIM/DIP

766

COLD CLIMATE PACK

766R

COLD CLIMATE PACK

766L

COLD CLIMATE PACK

767L

CENTRAL DOOR LOCKING

767R

CENTRAL DOOR LOCKING

768L

ALARM/CENTRAL DOOR 

LOCKING

768R

ALARM/CENTRAL DOOR 
LOCKING

769

RADIO

769R

RADIO

769L

RADIO

770

90 PUMA ENGINE

771

110 PUMA ENGINE

772

130 PUMA ENGINE