Discovery 2. Manual - part 734

BODY CONTROL UNIT

DESCRIPTION AND OPERATION

86-3-3

BCU outputs
The BCU processes the input signals it receives and uses the information to determine the control outputs that need 
to be established for any given set of conditions. The BCU provides controlled outputs for the following systems:

l

Interior courtesy lamps.

l

Fuel flap release actuator.

l

Anti-theft status LED.

l

Engine Control Module.

l

Door lock actuators.

l

Direction indicators and hazard warning lamps.

l

Headlamps.

l

Alarm sounder.

l

Vehicle horns.

l

Battery backed sounder.

l

Starter relay.

l

Passive re-mobilisation exciter coil.

Simultaneous switching of outputs in different units is limited by the bus transfer time, but the skew is no longer than 
100 ms for either the BCU or the IDM. When the processor is reset, all outputs are switched off until the inputs have 
been read for the first time to check current condition.

BCU to harness connectors

1 Connector C0661
2 Connector C0662
3 Connector C0663
4 Connector C0660
5 Connector C0664

BODY CONTROL UNIT

86-3-4

DESCRIPTION AND OPERATION

The pinout details for the BCU connectors are defined below:

C0660 connector pin details

Pin No.

Description

Input/Output

1

Ignition power supply

Input

2

Right front window - down

Input

3

Auxiliary power supply

Input

4

Passenger or rear door open

Input

5

Driver's door key lock

Input

6

RH indicator selected

Input

7

Front fog lamps selected

Input

8

Gear position feedback 'R'

Output

9

Gear position feedback 'P'

Output

10

SLS too high (audible warning)

Input

11

Earth

-

12

Vehicle raise/lower request

Output

13

Battery power supply

Input

14

Heated front screen selected

Input

15

Bonnet open

Input

16

CDL doors lock

Input

17

Driver's door open

Input

18

Left front window up

Input

19

Right front window up

Input

20

Rear washer pump

Input

21

Front intermittent wiper switch

Input

22

Gear position feedback '1'

Output

23

Gear position feedback '2'

Output

24

Gear position feedback '3'

Output

25

Gear position feedback 'D'

Output

26

Gear position feedback 'N'

Output

BODY CONTROL UNIT

DESCRIPTION AND OPERATION

86-3-5

C0661 connector pin details

Pin No.

Description

Input/Output

1

Serial bus to instrument pack and IDM

Input/Output

2

Not used

-

3

Battery backed up sounder code (AL)

Output

4

Diagnostic bi-directional 'K'-line

Input/Output

5

RF regulated power supply

Output

6

RF receiver input

Input

7

Brake switch activated

Input

8

Reverse gear selected

Input

9

Sunroof enable line

Output

10

Robust immobilisation

Output

11

Front washer pump

Input

12

Heated front screen relay

Output

13

Heated front screen active

Output

14

Battery backed up sounder code (ST)

Output

15

Heated rear screen active

Output

16

'N' or 'R' or 'P' or brake selected

Output

17

Not used

-

18

Passive remobilisation exciter coil

Output

19

RF battery supply from fuse 20 in passenger compartment fusebox

Input

20

Security status LED

Output

21

Front intermittent wiper

Input

22

Driver's door key unlock

Input

BODY CONTROL UNIT

86-3-6

DESCRIPTION AND OPERATION

C0662 connector pin details

Pin No.

Description

Input/Output

1

Front left window - down

Input

2

Ignition key inserted

Input

3

Rear wiper

Input

4

Vehicle horns

Input

5

Crank enable

Output

6

Gear position switch (Y contacts)

Input

7

CDL doors unlock

Input

8

Rear fog lamps selected

Input

9

Gear position switch (W contacts)

Input

10

Drive selected (HDC)

Output

11

Ignition key interlock solenoid

Output

12

Headlamp powerwash

Output

13

Gear position switch (X contacts)

Input

14

Not used

-

15

Transfer box - neutral selected

Input

16

Seat buckle fastened

Input