L322 Range Rover Steering Column System Description - Page 265
STEERING
DESCRIPTION AND OPERATION
57-13
On vehicles without memory seats, inputs from the column adjustment switch are received by the adjustment control
unit located under the column. The control unit interprets the signals from the switch and operates the requested
adjustment motor in the required direction.
On vehicles with memory seats, the adjustment control unit is not fitted. Inputs from the column adjustment switch are
received by the memory seat ECU which is incorporated into the driver's seat switch pack. The ECU interprets the
signals from the switch and operates the requested adjustment motor in the required direction. The motors used on
the memory vehicles have Hall effect sensors known as 'ripple counters'. These counters output the position of the
column when the seat memory store function is used and applies this setting to the applicable ignition key.