Components
Components
Seat Control Unit
The are two versions available; the standard and contour version.
The control unit is configured to move the seat depending on the version fitted, through 6 axes. It can also be configured for adjusting the steering column.
Standard Control Unit
The standard seat control Unit is capable of controlling four seat motors with hall sensors and two steering column motors. The switches for the controls are located in the control unit and shaped to give an indication of their corresponding function.
The control functions are:
1 Forward/backward movement
2 Seat height
3 Recline
4 Tilt.
The steering column switches are connected to the unit via a 4 pin connector. The functions are:
1 Up/down
2 Forward/backward
Contour Version
The contour version is fitted with two additional motors to control the seat in the following axes:
1 Seatback head adjustment.
2 Seat angle.
Seat Control Unit Sub-Systems
The are two versions available, the standard and contour version.
The system consists of an electrical sub-system and a mechanical sub-system and is controlled by the seat control unit fitted to the seat balance.
The electrical sub-system comprises the following components:
The mechanical sub-system comprises the following components:
^ Gear wheels
^ Rack and pinion assemblies.
Seat Power Relay
Located in the passenger compartment fusebox the seat power relay supplies battery voltage for seat adjustment. The motors are energised when a selection is made.
Seat Switch Pack
Each seat switch pack, mounted on the seat balance, provides movement in the following axes:
^ Seat forward/backward adjust
^ Seat height adjustment
^ Seat angle adjustment
^ Backrest angle adjustment
^ Backrest head adjustment
^ Head restraint height adjustment.
Manual adjustment of the seat position can be carried out at any time having priority over memory recall. The control unit sequences the order of adjustment.
Seat Forward/Backward Motor
The seat forward/backward motor is a permanent magnet motor occupied to a rack and pinion assembly. Should the motor seize or stick for 6 seconds or more an internal thermal cut-out switch will trip to remove voltage from the motor. Reset time for the switch is 35 seconds. Two pins within the seat switch pack control the seat forward/backward motor. Both pins are normally earthed. Operating the backward switch applies voltage to that pin while the other pin remains earthed. Operating the forward switch reverses power and earth to the motor allowing the motor to run in the opposite direction.
Seat Cushion Front Up / Down Motor
The seat cushion front up/down motor is a permanent magnet motor coupled to a rack and pinion assembly. Should the motor seize or stick for 6 seconds or more an internal thermal cut out switch will trip to remove voltage from the motor. Reset time for the switch is 35 seconds. Two pins within the seat switch pack control the seat cushion front up/down motor. Both pins are normally earthed. Operating the up switch applies voltage to that pin while the other pin remains earthed. Operating the down switch reverses power and earth to the motor allowing the motor to run in the opposite direction.
Seat Cushion Rear Up / Down Motor
The seat cushion rear up/down motor is a permanent magnet motor coupled to a rack and pinion assembly. Should the motor seize or stick for 6 seconds or more, an internal thermal cut out switch will trip to remove voltage from the motor. Reset time for the switch is 35 seconds. Two pins within the seat switch pack control the seat cushion rear up/down motor. Both pins are normally earthed. Operating the up switch applies voltage to that pin while the other pin remains earthed. Operating the down switch reverses power and earth to the motor allowing the motor to run in the opposite direction.
Seat Squab Forward/Backward Motor
The squab forward/backward motor is a permanent magnet motor coupled to a rotary rack and pinion assembly. Should the motor seize or stick for 6 seconds or more an internal thermal cut out switch will trip to remove voltage from the motor. Reset time for the switch is 35 seconds. Two pins within the seat switch pack control the squab fore/ aft motor. Both pins are normally earthed. operating the fore switch applies voltage to that pin while the other pin remains earthed. Operating the aft switch reverses power and earth to the motor allowing the motor to run in the opposite direction
Lumbar Pump
The lumbar pump inflates a bladder in the squab which provides extra support for the seat occupant. With no load on the seat it takes approximately 10 seconds to completely inflate the bladder. With a load of 25 Kg (55 lb) it takes approximately 15 seconds to inflate the bladder. A pressure cut off switch in the system will operate at 0.12 to 1.93 bar (1.8 to 28 lbf. sq.in). The lumbar bladder can be replaced independently of the pump. The components are not serviceable.
Manual Adjustment of Drive Motors
The seats can be manually adjusted at any time. Positioning is interrupted if manual adjustment is required during automatic adjustment (memory recall). The manual adjustment is not effective before the switch is operated again.
Due to the sequential activation of the drive motors the switch requests are prioritised in the following order:
^ Forward/backward adjustment
^ Backrest
^ Height
^ Angle
^ Head restraint
^ Backrest head
^ Steering column angle
^ Steering column forward/backward adjustment.