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
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