DESCRIPTION AND OPERATION
4.14 RANGE ROVER
When the drivers door switch is moved to the 'Down' position, the feed from fuse 11 of the
front 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 BG wire. Current flows across the motor and back to the
drivers door module (C2017) on a BS 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.
Front Passenger Window
When the passenger door switch is moved to the 'Up' position, the feed from fuse 24 of the
passenger compartment fuse box (C0583) flows through the passenger door module
(C2016) to earth on an N wire. The passenger door module (C2016) will now provide a feed
to the window lift motor (C0741) on a BS wire. Current flows across the motor and back to
the passenger door module (C2016) on a BG wire. The passenger 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 passenger door module.
When the passenger door switch is moved to the 'Down' position, the feed from fuse 24 of
the front passenger compartment fuse box (C0583) flows through the passenger door
module (C2016) to earth on an N wire. The passenger door module (C2016) will now provide
a feed to the window lift motor (C0741) on a BG wire. Current flows across the motor and
back to the passenger door module (C2016) on a BS wire. The passenger 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 passenger door module.
Anti-Trap
The anti-trap system consists of an anti-trap seal, which runs along the door glass frame.
The seal contains two elements, with a combined resistance of 1.2 kΩ. This resistance is
constantly monitored by the BCU via the P-bus. If the window meets an obstacle, it pushes
it against the anti-trap seal. This 'shorts' the two elements together, reducing the seals
resistance to approximately 500 Ω. When the BCU detects this drop in resistance, it
reverses the feed to the window lift motor. Both the drivers door module (C2058) and the
passenger door module (C2057) are connected to the anti-trap seals (C0599 & C0600
respectively) by NR wires. The anti-trap seals are both earthed on N wires.
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