DESCRIPTION AND OPERATION
4.20 RANGE ROVER
Drivers Door Mirror
Horizontal Adjustment
When RH adjustment of the drivers door mirror is required, the drivers door module (C2271)
provides a feed to the horizontal motor on a G wire. Current flows across the motor and back
to the drivers door module (C2271) on an R wire. If LH adjustment of the drivers door mirror
is required, the feed to the horizontal motor is reversed. The motor is provided a feed on an
R wire, with an earth path provided by the drivers door module (C2271) via a G wire.
To prevent the vertical motor from operating, the drivers door module (C2271) also provides
a feed to the vertical motor on an S wire. As the potential difference across the motor is 0V,
the motor does not operate.
Vertical Adjustment
When upwards adjustment of the drivers door mirror is required, the drivers door module
(C2271) provides a feed to the vertical motor on an S wire. Current flows across the motor
and back to the drivers door module (C2271) on an R wire. If downwards adjustment of the
drivers door mirror is required, the feed to the vertical motor is reversed. The motor is
provided a feed on an R wire, with an earth path provided by the drivers door module
(C2271) via an S wire.
To prevent the horizontal motor from operating, the drivers door module (C2271) also
provides a feed to the horizontal motor on a G wire. As the potential difference across the
motor is 0V, the motor does not operate.
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
drivers door module (C2058) via the P-bus on a UR wire.
When the drivers 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 drivers door module (C2271) provides a feed to both potentiometers on an O wire. The
horizontal potentiometer is provided an earth path by the drivers door module (C2271) on a
B wire. By measuring the current returned on a W wire, the drivers door module can
determine the mirror's horizontal position.
The vertical potentiometer is also provided an earth path by the drivers door module (C2271)
on a B wire. By measuring the current returned on a K wire, the drivers door module can
determine the mirror's vertical position.
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