Discovery 2. Manual - part 735

BODY CONTROL UNIT

DESCRIPTION AND OPERATION

86-3-7

C0663 connector pin details

Pin No.

Description

Input/Output

1

Crank selected

Input

2

LH direction indicator selected

Input

3

Driver/Passenger seat enable

Output

4

Front fog lamps

Output

5

Heated rear screen selected

Input

6

Ultrasonic input 

Input

7

Gear position switch (Z contacts)

Input

8

Ultrasonic power supply

Output

9

Courtesy lamps

Output

10

Feed to gear position switch (W, X, Y, Z contacts)

Output

11

Park/Neutral selected

Input

12

Hazard warning lamps

Input

BODY CONTROL UNIT

86-3-8

DESCRIPTION AND OPERATION

C0664 connector pin details

IDM inputs
The IDM inputs are communicated to the BCU using the serial datalink so that the BCU can perform the necessary 
logic operations:

The V

in

 for IDM digital signals are defined as follows:

l

Logic 1 when V

in

 

≥

 8V.

l

Logic 0 when V

in

 

≤

 2V.

IDM input voltages between 2 and 8 volts are indeterminate and cannot be guaranteed.

Pin No.

Description

Input/Output

1

Front left window down

Output

2

Front right window down

Output

3

Fuel flap release

Output

4

Front left window up

Output

5

Earth

-

6

Front right window up

Output

7

Battery power supply

Input

Description

Signal type

System

Inertia switch

Digital

Locking/ Unlocking/ Alarm

Side lamps

Digital

Exterior lighting

Headlamp dipped beam

Digital

Exterior lighting

Headlamp main beam daylight running lamps Analogue

Exterior lighting

RH direction indicators current sense

Analogue

Direction indicators/ Hazards/ Alarm

LH direction indicators current sense

Analogue

Direction indicators/ Hazards/ Alarm

Front wiper park sense

Digital

Wipers and washers

BODY CONTROL UNIT

DESCRIPTION AND OPERATION

86-3-9

IDM outputs
The IDM receives the following signals from the BCU using the serial datalink to provide power outputs:

Description

Signal type

System

Unlock all doors enable

Digital

Locking/ Unlocking/ Alarm

Lock passenger and rear doors enable

Digital

Locking/ Unlocking/ Alarm

Superlock all doors enable

Digital

Locking/ Unlocking/ Alarm

Lock driver's door

Digital

Locking/ Unlocking/ Alarm

Rear fog lamps enable

Digital

Exterior lighting

Daylight running lamps enable

Digital

Exterior lighting

LH direction indicators enable

Digital

Direction indicators/ Hazard warning/ Alarm

RH direction indicators enable

Digital

Direction indicators/ Hazard warning/ Alarm

Gear position indicator illumination

Digital

Illumination

Headlamp main beam indicator disable

Digital

Illumination

Front wiper enable

Digital

Wipers and washers

Rear wiper enable

Digital

Wipers and washers

Rear window enable

Digital

Power windows

Shift lever solenoid enable

Digital

Automatic gearbox

Transfer box solenoid enable/ Alarm sounder 
relay

Digital

Gearbox

Heated rear window enable

Digital

Heated screens

BODY CONTROL UNIT

86-3-10 DESCRIPTION AND OPERATION

Diagnostic socket

RHD illustrated

The BCU has a serial connection to the diagnostic socket to allow unit interrogation using TestBook.

In addition to fault diagnosis, the BCU can be programmed with the following information:

l

Plip codes.

l

Options.

l

VIN code.

l

EKA code.

l

EEPROM locking.

The following manufacturing details are programmed into the BCU which can be accessed using TestBook:

l

Date of manufacture.

l

Hardware version number.

l

Unit serial number.

l

Odometer reading.

It is not possible to use the diagnostic bus to communicate with the BCU via TestBook when the security system is 
active (except for passive immobilisation). This is a security measure to ensure that no key programming or market 
configuration can take place if the operator is not in possession of a valid remote transmitter or the vehicle keys.

The BCU is normally programmed to accept two remote transmitters, but a further two remote handsets can be 
programmed into the BCU and one optional Self Levelling Suspension (SLS) transmitter. All remote transmitters need 
to be available if TestBook is to be used to re-configure the BCU.

M86 4705