DESCRIPTION AND OPERATION
4.22 RANGE ROVER
Mirror Memory
The door mirror memory function works in conjunction with the seat and steering wheel
memory functions. The BCU (C0660) receives a memory request from the seat memory
ECU (C0862) via the K-bus on a WRY wire. The BCU (C0660) relays this message to the
passenger door module (C2057) via the P-bus on a UR wire.
When the passenger door module receives a memory request it moves the mirrors as
described above. Two potentiometers are fitted within the mirror assembly to determine its
position. The passenger door module (C2271) provides a feed to both potentiometers on an
O wire. The horizontal potentiometer is provided an earth path by the passenger door
module (C2271) on a B wire. By measuring the current returned on a W wire, the passenger
door module can determine the mirror's horizontal position.
The vertical potentiometer is also provided an earth path by the passenger door module
(C2271) on a B wire. By measuring the current returned on a K wire, the passenger door
module can determine the mirror's vertical position.
Mirror Fold
When the passenger door module (C2057) receives a folding request from the drivers door
module (C2058) via the P-bus, it provides a feed to the folding mirror motor on an RU wire.
Current flows across the motor and back to the passenger door module (C2271) on a GN
wire. The passenger door mirror now moves to the folded position. If the passenger door
module receives a second fold request, the feed to the folding mirror is reversed. The motor
is provided a feed on a GN wire, with an earth path provided by the passenger door module
(C2271) via an RU wire.
NOTE: Mirror fold is disabled if vehicle speed is greater than 10 km/h (6 mph).
Mirror Heater
If the BCU (C0660) receives an outside temperature reading of between -10 °C and 35 °C,
it informs the passenger door module (C2057) to initiate mirror heating via the P-bus on a
UR wire. Pin 7 of the drivers door module (C2271) provides a feed to the door mirror heater
on a B wire. An earth path is provided via pin 6 of the drivers door module (C2271), also on
a B wire.
NOTE: The driver and passenger door modules have the same connector numbers as they
utilise the same harness.
Door Mirror Memory
Door mirror memory information is stored in the driver and passenger door modules. When
the memory function is selected, the BCU (C0660) informs the driver (C2058) and
passenger (C2057) door modules to move the mirrors to the required position via the P-bus
on a UR wire.
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