DESCRIPTION AND OPERATION
RANGE ROVER 4.13
WINDOWS
DESCRIPTION
General
Operation of all four windows is controlled by the Body Control Unit (BCU) via the P-bus.
The P-bus allows communication between the BCU and the drivers and passenger door
modules. The door modules are mounted in the relevant front door. The drivers door module
features four rocker switches, and a non-latching switch to inhibit operation of the rear
windows. A rocker switch is also located on the front passenger door, and both rear
passenger doors for operation of the relevant window.
Both front and rear windows feature an anti-trap function. If an obstacle is detected while the
window is being closed, it will return to the fully open position.
For a detailed description of window lift operation, refer to the Windows section of the
Description and Operation Workshop Manual.
For a detailed description of the P-bus, refer to the Communication Databuses section of
the Description and Operation Workshop Manual.
OPERATION
Front
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 11, fuse 24, and fuse 53
of the passenger compartment fuse box (C0632) on an R wire. Fuse 11 (C0585) provides a
constant battery feed to the drivers door module (C2017) on an RP wire. Fuse 24 (C0583)
provides a constant battery feed to the passenger door module (C2016) on an RW wire.
Fuse 53 (C0583) provides a constant battery feed to the ignition switch (C0099 on Td6
vehicles, C0028 on V8 vehicles) on an R wire. When the ignition switch is turned to the
'auxiliary' position, current flows across the switch (C0099 on Td6 vehicles, C0028 on V8
vehicles) to fuse 41 of the passenger compartment fuse box (C0585) on a PB wire. Fuse 41
(C0586) provides an auxiliary ignition feed to the Body Control Unit (BCU) (C0660) on a PW
wire. The BCU (C0662) is earthed on an N wire.
Drivers Window
When the drivers door switch is moved to the 'Up' position, the feed from fuse 11 of the
passenger compartment fuse box (C0585) flows through the drivers door module (C2017)
to earth on an N wire. The drivers door module (C2017) will now provide a feed to the
window lift motor (C0740) on a BS wire. Current flows across the motor and back to the
drivers door module (C2017) on a BG wire. The drivers door module provides an earth path
for the motor on an N wire. When the current draw of the window lift motor increases, the
BCU (via the P-bus) determines the window has reached the limit of its travel and cuts the
supply from the drivers door module.
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