Description
Seats
CONTROL DIAGRAM - MOVEMENT - MEMORY SEATS
CONTROL DIAGRAM - MOVEMENT - NON-MEMORY SEATS
CONTROL DIAGRAM - TEMPERATURE
HEATED SEATS - OPERATION
Heated Front Seats
The TSD receives a fused power supply from the RJB (rear junction box). One of the 3 seat heat temperature selections made by the driver or passenger using the TSD soft keys are passed from the TSD on the MOST ring to the Information and Entertainment module. The information and entertainment module processes the information and transmits the request on the medium speed CAN (controller area network) bus to the ATC (automatic temperature control) module.
The cushion heaters have a thermal sensor which supplies a feed back signal back to the CJB (central junction box). The squab heater elements do not have a thermal sensor and are maintained at the same temperature as the seat cushion elements.
The ATC (automatic temperature control) module reacts to the driver request information received from the information and entertainment module and requests the CJB (central junction box) to activate the seat heaters. The CJB (central junction box) measures the returned temperature signals from the thermal sensors and relays the temperature signals back to the ATC (automatic temperature control) module. The ATC (automatic temperature control) module then uses the measured seat element temperatures to provide closed-loop control of the heater elements to maintain the temperature at one the 3 heat ranges selected.
NOTE:
To prevent excessive battery discharge, the heated front seats will only operate when the engine is running.
Heated and Cooled Front Seats
The TSD receives a fused power supply from the RJB (rear junction box). Selections made by the driver using the TSD soft keys are passed from the TSD on the MOST ring to the Information and Entertainment module. The information and entertainment module processes the information and transmits the request on the medium speed CAN (controller area network) bus to the front seat climate control module. The front seat climate control module is located beneath the RH (right-hand) front seat, on the floor cross member.
The front seat climate control module receives its power supplies from the CJB (central junction box). Heating and cooling requests are generated using the soft buttons on the TSD. These requests are transmitted to the information and entertainment module over the MOST ring. The Information and Entertainment module forwards these requests to the front seat climate control module over the medium speed CAN (controller area network) bus.
The front seat climate control module supplies power to the two climate modules in each seat. The temperature sensor in each climate module is monitored by the front seat climate control module which uses the temperature information to control the Peltier cells accordingly and also the blower fans to distribute the heated or cooled air.
NOTE:
To prevent excessive battery discharge, the heated and cooled front seats will only operate when the engine is running.
Electric Driver's Seat Adjustment - Non-Memory Seats
The CJB (central junction box) supplies 3 power supplies to the driver's seat switchpack. The fused supplies provide power for the seat height and squab recline, the seat slide and seat tilt and the lumbar adjustment respectively. The CJB (central junction box) only provides the power to the driver's seat switch pack when the ignition is on (power mode 6).
For the seat movement motors, when the applicable switch is operated, the power is supplied to the applicable side of the motor and the ground path is completed to operate the motor in the required direction. To move the motor in the opposite direction the polarity is reversed.
For the lumbar adjustment, when the switch is operated in the inflate position, power is supplied to the pump motor to inflate the lumbar support. When the switch is operated in the opposite direction, the power energizes a solenoid which in turn opens a valve to deflate the lumbar support.
Electric Passenger Seat Adjustment ( 8, 10 and 12 way)
The CJB (central junction box) supplies 3 power supplies to the passenger seat switchpack. The fused supplies provide power for the seat height and squab recline, the seat slide and seat tilt and the head restraint and lumbar adjustment respectively. The CJB (central junction box) only provides the power to the passenger seat switch pack when the ignition is on (power mode 6).
For the seat movement and head restraint motors, when the applicable switch is operated, the power is supplied to the applicable side of the motor and the ground path is completed to operate the motor in the required direction. To move the motor in the opposite direction the polarity is reversed.
For the lumbar adjustment, when the switch is operated in the inflate position, power is supplied to the pump motor to inflate the lumbar support. When the switch is operated in the opposite direction, the power energizes a solenoid which in turn opens a valve to deflate the lumbar support.
Electric Driver's Seat Adjustment - Memory Seats (10 and 16 way)
The CJB (central junction box) supplies 3 power supplies to the driver's seat module and one supply to the driver's seat switch pack. The fused supplies provide power for the movement motors in addition to the driver's seat switch pack. Power is only supplied to the driver's seat module and the driver's seat switch pack when the ignition is on (power mode 6).
The driver's seat switch pack is connected to the driver's seat module by a LIN (local interconnect network) bus for the seat movement switches. Any selection for seat movement generates a message which is passed via the LIN (local interconnect network) to the driver's seat module. The seat module processes the request and operates the applicable seat function as required using the power supplies from the CJB (central junction box).
Each seat motor contains a Hall position sensor. The sensor sends a feedback signal to the driver's seat module. The signal is used for memory store and memory recall functions.
The lumbar adjustment switch on the driver's seat switch pack is wired direct to the lumbar pump and solenoids. The switch, when moved to the inflate position for either the upper or lower inflatable cushion cell, provides a power supply to the lumbar pump and simultaneously activates the applicable inflate solenoid valve. When the switch is released the pump stops and the solenoid valve closes trapping the air in the inflatable cushion. When the switch is moved to the deflate position for either the upper or lower inflatable cushion cell, power is supplied to the applicable deflate solenoid valve which opens to allow the air in the cushion to escape. When the switch is released, the valve is closed and the remaining air in the cushion is retained.
FRONT SEATS - DESCRIPTION
The table below highlights the features available for each seating option.
Seat Heating
The 3-stage heated front seats feature 2 heater elements located in the seat cushion and a single heater element located in the seat squab. Operation of the heated front seats is controlled by the ATC (automatic temperature control) module via the TSD, information and entertainment control module and the CJB (central junction box) module on vehicles with heated seats. On vehicles with heated and cooled seats the operation is controlled by the TSD, information and entertainment control module and the front seat climate control module.
The heated and cooled front seats each contain 2 climate modules; one in the cushion, one in the squab. The climate modules contain 'Peltier' cells which are able to deliver heating and cooling based on a voltage provided by the front seat climate control module. Each climate module also contains a fan, which blows air over the Peltier cells to distribute heated or cooled air via liners in the seat cushion and squab. The fan is also controlled by the front seat climate control module. The TSD allows the driver and passenger to select 3 ranges of heated or cooled ventilation; off, minimum and intermediate. Also, using the selections on the TSD, the driver and passenger can select between full seat ventilation or squab backrest ventilation only.
Vehicles fitted with the 3-stage heated front seat option also feature a heated steering wheel. For additional information, refer to Steering Column Switches Description
Electric Seat Adjustment
Lumbar Support
On 8, 10 and 12 way seats, a 2 way lumbar support is provided which allows the lumbar inflatable cushion to be inflated or deflated as required. On 16 way seats, a 4 way lumbar support is fitted which comprises two separate cushion cells. The upper and lower cells can be inflated or deflated individually allowing greater comfort adjustment for the driver and passenger.
The lumbar support comprises an inflatable cushion located in the seat squab, a pump and solenoids. The pump is activated when the applicable seat switch is moved to the inflate position, inflating the cell(s) in the inflatable cushion. On 8 and 10 way seats, a single solenoid operated valve allows the inflatable cushion to be deflated. On 12 and 16 way seats, 4 solenoid valves control the inflation and deflation of the upper and lower inflatable cushion cells, allowing each cell to be adjusted individually.
Seat Motors
The head restraint motor is located in the upper section of each seat squab and is accessible by removal of the seat back. The motor moves a cradle which is driven in a vertical motion by a rack and pinion arrangement. The cradle has the two head restraint stems attached to it and therefore raises and lowers the head restraint as the motor moves the cradle. The motor contains a Hall sensor which supplies positional information to the driver's seat module.
The seat slide motor is an integral component of the seat frame. The motor drives on a gear on a worm drive lead screw which is integral with the floor rail. The lead screw has a stop at each end to limit the fore and aft seat movement.
The tilt motor is located below the seat. The tilt motor drives a gear on a lead screw to raise the front of the seat cushion. The motor contains a Hall sensor which supplies positional information to the driver's seat module.
The cushion extend motor is located below the seat. The motor drives a gear on a lead screw which extends or retracts the front of the seat cushion. The motor contains a Hall sensor which supplies positional information to the driver's seat module.
The height motor is located below the seat. The height motor drives a gear on a lead screw. The lead screw moves a lever mechanism which raises or lowers the seat cushion. The motor contains a Hall sensor which supplies positional information to the driver's seat module.
The squab recline motor is located in the seat back rest. The recline motor rotates a shaft which is connected the seat squab frame and raises or lowers the back rest position. The motor contains a Hall sensor which supplies positional information to the driver's seat module.
DRIVER'S SEAT MODULE
A memory store switch is located in the lower part of the driver's door. The switch communicates with the driver's eat module via the LIN (local interconnect network) bus in the driver's seat switch pack. The memory store switch has two buttons; 1 and 2 to allow two separate memory positions to be stored and 'set' button with integral LED (light emitting diode). The seat, door mirror and steering column motors have position sensors which provide feedback to driver's seat module.
Once the driver's seat, steering column and exterior mirrors have been adjusted, the vehicle is able to memorize these settings for future use by using the following procedure:
- Push the memory 'SET' button, the LED (light emitting diode) in the switch will illuminate
- Press the memory button 1 or 2 to memorize the current settings. The LED (light emitting diode) will extinguish, and a chime will sound to confirm that the settings have been memorized. If the ignition is on, power mode 6, the message center will display a confirmation message.
The positions can be recalled by pressing the applicable button 1 or 2.
Stall Detection
Seat, steering column and mirror motors are deemed to have stalled if there is no change in the inputs that are received from the corresponding feedback sensors for 200 ms (seat).
If a stall condition is detected then the drive to that motor is cancelled for the remainder of that memory operation (memory recall) or until the switch is re-selected (manual movement).
If the motor movement has stopped due to loss of sensor feedback, either stall or sensor failure, then that motor may be activated again, to move past the stall position, by re-selecting the appropriate switch and pressing for longer than 2 seconds. This allows control of the motor to be maintained if sensor feedback is lost.
Upon re-selection of movement, if sensor pulses are detected then the motor will continue to be driven until the switch is released or another stall condition is detected. If sensor feedback is not detected then the motor is only driven for 0.5 second and then stops until the switch is released and then pressed again, when a further 0.5 second of activation is permitted, and so on, this is known as inch mode.
For all seat motor manual movements, whenever a motor is driven and a stall occurs, the memory control module records the position at which the stall occurred. If movement occurs beyond a stall position, then that position is erased from the control modules memory. This will always allow movement past a previously recorded stall position once movement has been registered beyond that position. This is the case for both manual and memory movement.
Initialization
When a replacement driver's seat module is fitted, it should be calibrated a Jaguar approved diagnostic system so that the module can learn the seats absolute position.
Battery Monitor
If the battery voltage drops below 10.5 Volts, then the driver's seat module ignores all requests for a memory recall until the battery voltage has reached 11.5 Volts. This will conserve as much power in the vehicle battery as possible to enable engine cranking.
REAR SEATS - DESCRIPTION
The rear seat features a single piece cushion and a 60/40 split squab. Two latches are secured to the rear bulkhead by a pair of M8 bolts to retain the seat squabs in the upright position. The latches can be released to fold down the individual cushions by pulling a cable release located below the rear window parcel shelf in the luggage compartment.
ISOFIX fastening points are attached to the vehicle floor to provide secure fastening for compatible child seats.
A centrally mounted center arm rest can be folded down from the 60% squab. The arm rest contains two drinks holders.