Description

Seats

NOTE:
A = Hardwired; N = Medium Speed CAN bus; O = LIN Bus

ADJUSTMENT - NON-MEMORY FRONT SEAT

ADJUSTMENT - MEMORY FRONT SEAT

ADJUSTMENT - REAR SEATS

HEATED SEATS - FRONT AND REAR

CLIMATE SEATS - FRONT AND REAR

SEAT MASSAGE - FRONT SEATS

SEAT MASSAGE - REAR SEATS

PRINCIPLES OF OPERATION

FRONT SEATS

Adjustment - Non-memory Seats
On non-memory front seats, each seat switch pack receives three permanent power supplies; two from the CJB (central junction box) and one from the RJB (rear junction box). The power supplies from the CJB (central junction box) are used to operate the adjustment motors. The power supply from the RJB (rear junction box) is used to operate the air pump and associated solenoid valves.
For the adjustment motors, when a switch is operated power is connected to the applicable side of the related motor and a ground is connected to the opposite side of the motor, which then runs in the required direction. To move the motor in the opposite direction the polarity is reversed.
When the lumbar inflate switch is pressed, power is connected to the air pump to inflate the support. When the deflate switch is pressed, power is connected to the deflate solenoid valve, which opens to deflate the support.

Adjustment - Memory Seats
On memory front seats, the seat module receives three permanent power supplies; two from the CJB (central junction box) and one from the RJB (rear junction box). The power supplies from the CJB (central junction box) are used to operate the adjustment motors. The power supply from the RJB (rear junction box) is used to operate the seat module.
Permanent power supplies are also connected from the CJB (central junction box) to the memory switch pack and from the RJB (rear junction box) to the seat switch pack.
The seat switch pack is connected to the seat module by a LIN (local interconnect network) bus for the seat adjustment switches. Any selection for seat adjustment generates a message which is passed via the LIN (local interconnect network) bus to the seat module. The seat module processes the request and operates the applicable seat motor as required using the power supplies from the CJB (central junction box).
The seat module on the driver seat is also connected to the medium speed CAN (controller area network) bus. This allows the driver seat module to monitor the position of the door mirrors and the steering column, using signals from the door modules and CJB (central junction box) respectively, when storing and recalling memory settings.
The memory switch pack has two hardwired connections with the related seat switch pack. One is for the three channel switches and one is for the memory switch. Operation of the any of the memory switches is relayed from the seat switch pack to the seat module on the LIN (local interconnect network) bus.
Memory settings are stored in the seat module by pressing the memory switch and then, within 5 seconds, one of the channel switches. When the memory switch is pressed the LED (light emitting diode) in the switch comes on. After the channel switch is pressed, the LED (light emitting diode) goes off and a chime sounds to confirm that the settings have been memorized. If the ignition is on, the message center will display a confirmation message. Any previously stored settings on the selected channel will be over-written.
Memory settings are recalled by pressing the applicable channel switch. If the ignition is on, the message center will display a confirmation message.
On seats with 2-way lumbar adjustment, when the inflate switch is pressed power is connected to the air pump to inflate the support. When the deflate switch is pressed, power is connected to the deflate solenoid valve, which opens to deflate the support.
On seats with 4-way lumbar adjustment and bolster adjustment, when an inflate switch is pressed, power is simultaneously connected to the air pump and the related inflate solenoid valve. When a deflate switch is pressed, power is connected to the related deflate solenoid valve, which opens to deflate the support. On vehicles with massage seats, power is connected to the inflate and deflate solenoid valves in the same way, but when an inflate selection is made the air pump is activated by a LIN (local interconnect network) bus message to the master solenoid valve, which then operates the air pump.
Stall Detection
A seat adjustment motor is deemed to have stalled if there is no change in the input from the feedback sensor of the motor for 200 ms. If a stall condition is detected then the drive to that motor is cancelled for the remainder of the memory recall operation or until the switch is re-selected (manual movement). The motor may be activated again, to move past the stall position, by pressing the appropriate switch for more than 2 seconds. If sensor feedback is detected, then the motor will continue to be driven until the switch is released. 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 pressed again, when a further 0.5 second of activation is permitted. This is known as inch mode, which allows seat adjustment to be maintained if sensor feedback is lost.
Initialization
When a replacement seat module is fitted, it should be calibrated using Jaguar approved diagnostic equipment so that the module can learn the positions of the adjustment motors.
Battery Monitor
If the battery voltage drops below 10.5 V, then the driver seat module ignores all requests for a memory recall until the battery voltage has reached 11.5 V. This will conserve as much power in the vehicle battery as possible to enable engine cranking.

Massage Seats
Seat massage requests from the START / STOP buttons on the TSD are sent via the medium speed CAN (controller area network) bus to the appropriate seat module. The seat module processes the requests and transmits them to the master massage solenoid on the LIN (local interconnect network) bus connection.
When a START button is pressed, the master massage solenoid operates the relevant master and slave solenoid valves and activates the pump. The massage function operates in 10 minute cycles. After a 10 minute cycle is complete the user must re-select the function if a further 10 minute cycle is required.
When a STOP button is pressed, the 10 minute cycle is completed, or the ignition is switched off, the solenoid valves are opened to deflate the massage cells and the air pump turned off.
During operation the bottom cell pair inflate and then deflate. As the first cell pair are deflating the second cell pair start to inflate. This sequence is repeated for all five cell pairs, from cell pair one at the bottom to cell pair five at the top. Cell inflation time, which varies between cell pairs, is as follows:
- Cell pair one - 3 seconds.
- Cell pair two - 2.6 seconds.
- Cell pair three - 2.8 seconds.
- Cell pair four - 2.2 seconds.
- Cell pair five - 1.6 seconds.

Anti-Whiplash System (AWS)
Depending on the weight of the occupant and the severity of the collision, the mechanisms begin to operate at a relative impact speed of between approximately 8.7 and 11.2 mph (13.9 and 17.9 km/h). At the point of a rear impact, the forward energy of the impact and the inertia of the occupant combine to push the backrest against the occupant's back. That causes the AWS mechanism to begin a controlled sequence of movements. First, while remaining in an upright position, the backrest moves rearwards by approximately 50 mm. Next, the backrest reclines through an angle dependant upon the direction and relative speed of the collision, up to a maximum of approximately 15 degrees.
The combined effect of these movements is to absorb some of the energy of the impact and reduce the relative acceleration of head and body, thereby helping to reduce the possibility of whiplash injury.

HEATED SEATS
The heater elements only operate when the engine is running. Power for the heater elements is supplied to the seat heater modules from the heated seat relay in the RJB (rear junction box), which is controlled by a hardwired ignition signal from the CJB (central junction box).
Seat heating selections made on the TSD and the rear climate control panel are transmitted to the ATC (automatic temperature control) module. For additional information, refer to Heating and Ventilation Description
When the ATC (automatic temperature control) module receives a seat heating request, it sends a LIN (local interconnect network) bus message to the appropriate seat heater module to energize the heater elements in the cushion and the squab. The seat heater module relays the temperature signal, from the thermal sensor in the cushion heater element, back to the ATC (automatic temperature control) module. The ATC (automatic temperature control) module uses the temperature signal to regulate the heater elements at the selected heat setting.

CLIMATE SEATS
The heating/cooling of the climate seats only operates when the engine is running. Power for the climate modules is supplied to the climate seat control modules by two permanent power supplies from the CJB (central junction box). The climate seat control modules also receive a power supply from the ignition relay in the CJB (central junction box).
Heating/Cooling selections on the TSD and the rear climate control panel are transmitted to the appropriate climate seat control module on the medium speed CAN (controller area network) bus. The climate seat control module then energizes the Peltier cell and the blower of the climate module(s) in the appropriate seat. The climate seat control module uses the signals from the temperature sensors in the squab and the cushion climate modules to regulate the seat at the selected temperature. If full seat heating/cooling is selected, both the squab and the cushion climate modules are activated. If partial seat heating/cooling is selected, only the squab climate module is activated.

REAR SEATS

Adjustment
The rear seat adjustment is only active when the smart key is in the vehicle and the ignition is on.
Each rear seat switchpack receives a logic power supply from the CJB (central junction box) via fuse F47. Each switchpack is connected to its respective rear seat control module by a LIN (local interconnect network) bus connection.
Each rear seat module receives two power supplies from the CJB (central junction box) to operate the recline motor, the lumbar pump and the solenoids.
Operation of the rear seat switchpack switches for seat recline produces a LIN (local interconnect network) bus message to the respective rear seat control module. The seat control module then provides a power supply to the applicable seat recline motor. Each recline motor has a Hall effect sensor to determine the position of the seat.
A seat recline motor is deemed to have stalled if there is no change in the input from the Hall sensor of the motor for 200 ms. If a stall condition is detected then the power supply to the motor is removed until the switch is re-selected. The motor may be activated again. If sensor feedback is detected, then the motor will continue to be driven until the switch is released. If Hall sensor feedback is not detected, then the motor is only driven for 0.5 second and then stops until the switch is released and pressed again.

Initialization
When a replacement seat module is fitted, it should be calibrated using Jaguar approved diagnostic equipment so that the module can learn the positions of the recline motors.

Massage Seats
Seat massage requests from the seat switchpack are passed on a LIN (local interconnect network) bus to the appropriate seat module. The seat module processes the requests and transmits them to the master massage solenoid on a LIN (local interconnect network) bus connection.
When the ON button is pressed on the seat switchpack, the master massage solenoid operates the relevant master and slave solenoid valves and activates the pump. The massage function operates in 10 minute cycles. After a 10 minute cycle is complete the user must re-select the function if a further 10 minute cycle is required.
When the OFF button is pressed on the seat switchpack, the 10 minute cycle is completed, or the ignition is switched off, the solenoid valves are opened to deflate the massage cells and the air pump turned off.
During operation the bottom cell pair inflate and then deflate. As the first cell pair are deflating the second cell pair start to inflate. This sequence is repeated for all five cell pairs, from cell pair one at the bottom to cell pair five at the top. Cell inflation time, which varies between cell pairs, is as follows:
- Cell pair one - 3 seconds.
- Cell pair two - 2.6 seconds.
- Cell pair three - 2.8 seconds.
- Cell pair four - 2.2 seconds.
- Cell pair five - 1.6 seconds.

FRONT SEATS ADJUSTMENT
Electric motors are used to provide adjustment of seat slide, seat height, squab recline and, where fitted, cushion tilt, head restraint and cushion extension. An air pump and inflatable cushions are used to provide adjustment of the lumbar support and the squab bolster supports (where fitted).
All of the seat adjustments are controlled from the seat switch pack on the outside of the seat cushion. On non memory seats, the control switches are connected directly to the adjustment motors. On memory seats, the switches are connected to the adjustment motors via a seat control module. Memory seats also have a memory switch pack in the related door panel.

Adjustment Switches

Memory Switch Pack

Seat Motors
Each adjustment motor contains a Hall position sensor. The sensors provide position feedback signals which, on seats with a memory function, are used for memory store and recall operation.
The seat slide motor is an integral component of the cushion frame. The motor drives 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 seat height motor is located below the seat. The motor drives a gear on a lead screw. The lead screw moves a lever mechanism, which raises or lowers the seat cushion.
The squab recline motor is located in the squab frame. The recline motor rotates a shaft connected to the squab frame, which changes the angle of the squab.
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 head restraint motor is located in the upper section of the squab frame and is accessible by removal of the seat back. The motor moves a cradle by a rack and pinion arrangement. The cradle has two head restraint stems, which raise and lower the head restraint as the motor moves the cradle.
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.

Lumbar Adjustment
Lumbar adjustment is provided by a lumbar support and air pump installed in the squab. The lumbar support consists of an inflatable cushion with either a single air cell (2-way lumbar support) or dual air cells (4-way lumbar support), depending on vehicle specification. On vehicles with massage seats, the dual cell lumbar support is operated by the air pump of the massage system.

2-way Lumbar Support

4-way Lumbar Support

Squab Bolster Adjustment
Squab bolster adjustment is provided by inflatable cushions on the inside faces of the squab bolsters. The inflatable cushions are operated simultaneously by a solenoid valve block and the air pump of the lumbar support or the massage seat system. On vehicles with massage seats, the squab bolster solenoid valves are incorporated into the valve block containing the slave massage solenoid valves.

Squab and Lumbar Support

MASSAGE FRONT SEATS
Where fitted, the massage system in each seat consists of an air pump, air cell pads, master and slave solenoid valve blocks. The air pump is also used for adjustment of the lumbar and squab bolster supports. The slave solenoid block also incorporates the solenoid valves used to control the squab bolster supports.
Operation of the massage system is controlled with START and STOP buttons on the climate menu of the TSD and is independent of the lumbar and squab bolster adjustments.

Air Pump

The air pump is located underneath the seat at the rear of the squab. The pump is housed inside a NVH (noise, vibration and harshness) casing to cut down the pump operation sound level. Operation of the air pump is controlled by the master solenoid valve block.
The maximum pump pressure is controlled by a pressure relief valve in the lumbar solenoid valve block. The maximum pressure range is 310.5 to 379.5 mbar (4.5 to 5.5 lbf/in2.).
A thermal protection device in the air pump stops pump operation if the temperature increases to 72±4 °C (162±7 °F). The pump will not re-start until 10 minutes after the temperature decreases below the cut-off temperature.

Solenoid Valves

The massage air cells are located in two pads in the front of the seat squab. The lower pad contains three separate pairs of cells, the upper pad contains two separate pairs of cells.
During operation the pressure of the air cells is approximately 207 to 379 mbar (3 to 5.5 lbf/in2.). This variation is due to the inflate time given to each air cell, the flow rate of the pump and the maximum pressure of the system.

HEATED FRONT AND REAR SEATS
Heated seats incorporate heater elements in the cushion and the squab of the seat. Power to the heater elements of the front seats is controlled by two seat heater modules attached to a bracket on the cabin floor, under the carpet at the front left corner of the LH (left-hand) front seat. Power to the heater elements of the two outside rear seats is controlled by two seat heater modules attached to a bracket on the back of the rear seat squab.
Each cushion heater element has a thermal sensor, which supplies a feedback temperature signal to the related seat heater module. The squab heater elements do not have a thermal sensor, and are regulated at the same temperature as the cushion heater elements.
Seat heating for the front and rear seats can be selected on the climate menu of the TSD. Seat heating for the rear seats can also be selected on the rear climate control panel. Three levels of heating are available. Heating can also be selected for either the cushion and the squab or just the squab.

CLIMATE FRONT AND REAR SEATS
Climate seats incorporate climate modules in the cushion and the squab of the seat. Operation of the climate modules of the front seats is controlled by a climate seat control module attached to a bracket on the cabin floor, under the carpet at the front left corner of the LH (left-hand) front seat. Operation of the climate modules of the two outside rear seats is controlled by a climate seat control module attached to the body, behind the of the rear seat squab.
The climate modules contain Peltier cells, which heat up or cool down depending on the voltage provided by the climate seat control module. Each climate module also contains a blower, which blows air over the Peltier cell to distribute the heated or cooled air through liners in the related cushion or squab. The blower is also controlled by the climate seat control module.
Seat heating and cooling for the front and rear seats can be selected on the climate menu of the TSD. Seat heating and cooling for the rear seats can also be selected on the rear climate control panel. Three levels of heating and three levels of cooling are available. Heating and cooling can also be selected for either the cushion and the squab, or just the squab.

Touch Screen Display

Rear Climate Control Panel

REAR SEATS ADJUSTMENT
An electric recline motor is used to provide adjustment of seat squab recline. An air pump and inflatable cushions are used to provide adjustment of the lumbar support.
All of the seat adjustments are controlled from the seat switchpack on the outside of the seat cushion. The control switches are connected via a LIN (local interconnect network) bus to the seat control module to the adjustment motors via a seat control module.
Rear seat switchpack functions are disabled if the rear window isolation switch has been activated.

Adjustment Switches (LHD (left-hand drive) version shown

The rear seat control switchpack on the passenger side of the vehicle also has a front passenger seat away switch. This switch when pressed will move the front passenger seat forwards or backwards to allow more room for the rear seat passenger on that side. A second switch for this function is located on the inside face of the front passenger seat back to allow the driver to operate the function.

Front Passenger Seat Away Switch

The front passenger seat way function allows the driver to adjust the position of the front passenger seat using a switch located on the passenger seat bolster.
The two-way rocker switch allows the driver to move the front passenger seat forward or rearwards to adjust leg room for the rear seat passenger.
The rear seat adjustment switchpack for the rear seat behind the front passenger seat, has an additional two-way switch to move the front passenger seat forwards or rearwards, allowing the passenger to adjust the available leg room.

MASSAGE REAR SEATS
Where fitted, the rear seat massage system in each seat consists of an air pump, air cell pads, master and slave solenoid valve blocks. The air pump is also used for adjustment of the lumbar supports.
Operation of the massage system is controlled with START and STOP buttons on the rear seat adjustment switches.
The air pump is located at the rear of the squab. The pump is housed inside a NVH (noise, vibration and harshness) casing to cut down the pump operation sound level. Operation of the air pump is controlled by the master solenoid valve block.
The maximum pump pressure is controlled by a pressure relief valve in the slave solenoid valve block. The maximum pressure range is 310.5 to 379.5 mbar (4.5 to 5.5 lbf/in2.).
A thermal protection device in the air pump stops pump operation if the temperature increases to 72±4 °C (162±7 °F). The pump will not re-start until 10 minutes after the temperature decreases below the cut-off temperature.

Solenoid Valves

The master and slave solenoid valve blocks control the air supply to the massage air cells. During air cell deflation excess air is exhausted to atmosphere through the relevant solenoid valve block exhaust port.
The massage air cells are located in two pads in the front of the seat squab. The lower pad contains three separate pairs of cells, the upper pad contains two separate pairs of cells.
During operation the pressure of the air cells is approximately 207 to 379 mbar (3 to 5.5 lbf/in2.). This variation is due to the inflate time given to each air cell, the flow rate of the pump and the maximum pressure of the system.