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:

Interior courtesy lamps.
Fuel flap release actuator.
Anti-theft status LED.
Engine Control Module.
Door lock actuators.
Direction indicators and hazard warning lamps.
Headlamps.
Alarm sounder.
Vehicle horns.
Battery backed sounder.
Starter relay.
Passive re-mobilization 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.

Fig 1: Identifying Terminal Connector

Courtesy of LAND ROVER NORTH AMERICA, INC.

The pinout details for the BCU connectors are defined below:

Fig 2: Identifying BCU Connector

Courtesy of LAND ROVER NORTH AMERICA, INC.

PIN DESCRIPTION

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

Fig 3: Identifying Connector

Courtesy of LAND ROVER NORTH AMERICA, INC.

PIN DESCRIPTION

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 immobilization	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 re-mobilization 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

Fig 4: Identifying Front Left Window Terminal Connector

Courtesy of LAND ROVER NORTH AMERICA, INC.

PIN DESCRIPTION

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

Fig 5: Identifying Terminal Connector

Courtesy of LAND ROVER NORTH AMERICA, INC.

PIN DESCRIPTION

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

Fig 6: Identifying Terminal Connector

Courtesy of LAND ROVER NORTH AMERICA, INC.