L322 Range Rover System Description and Operation
BODY CONTROL UNIT
86-3-4
DESCRIPTION AND OPERATION
Load Disconnection
The BCU supplies various electrical loads on the vehicle, such as the glovebox lamp, reading lamps, luggage
compartment lamps, etc., that can be switched on and remain on when the vehicle is parked. A central load
disconnection feature in the BCU ensures the battery is not discharged in the event these loads are switched on
continuously. The trigger time after the ignition is switched off is 16 minutes and is independent of the sleep mode
timer.
The BCU also disconnects the following loads while the engine cranks, to maximise the available power from the
battery:
l
Wipers
l
Washer pump
l
Headlamp cleaning
l
Window regulators
l
Sunroof.
If the one-touch function of a window or sunroof is active before the load disconnection, the function is not continued
when engine cranking stops.
Sleep Mode
To conserve power, the entire BCU goes into a 'sleep' mode 16 minutes after signal activity ceases and the ignition
is switched off. The typical current consumption of the BCU in sleep mode is 1.25 mA. In the sleep mode the BCU is
in a limited operational mode from which it can be awakened by certain relevant wake-up signals. After being
awakened, the BCU remains awake for 1 minute if no action is triggered. If an action is triggered, the BCU remains
awake for at least 16 minutes.
BCU
Automatic locking 2 minutes after
unlocking without opening
Active/ Inactive
BCU
Automatic locking after driving off
Active/ Inactive
Car
BCU
Automatic locking threshold speed
after driving off
2.5 to 17.5 mph (4 to 28 km/h) at
fixed intervals
Car
BCU
Driver's window one-touch open
function
Active/Inactive
Car
BCU
Driver's window one-touch close
function
Active/Inactive
Car
BCU
Front passenger window one-touch
open function
Active/Inactive
Car
BCU
Front passenger window one-touch
close function
Active/Inactive
Car
BCU
Rear windows one-touch open
function
Active/Inactive
Car
BCU
Rear windows one-touch close
function
Active/Inactive
Car
BCU
Window switch-off criterion
Europe
NAS
Car
BCU
Wiper reset (only without rain
sensor)
Active/Inactive
Car
BCU
Comfort function via remote control,
open all windows and sunroof
Active/Inactive
Car
BCU
Comfort function via remote control,
close all windows and sunroof
Active/Inactive
Car
BCU
Sunroof one-touch slide open
function
Active/Inactive
Car
BCU
Sunroof one-touch slide close
function
Active/Inactive
Car
BCU
Automatic locking after driving off
Active/ Inactive
Key
BCU
Remote central locking actuation
1st press open driver's door, 2nd
press open all doors
1st press open all doors
Key
Control Unit
Function
Parameter
Memory Type