Jaguar XJ (X350). Manual — part 1436

components and after it has been activated the complete front seat backrest must be replaced.

The standard front seat is equipped with electric height adjustment, forward and rearward
adjustment, seat cushion tilt, head restraint and seat backrest recline motors. The standard
front seat also incorporates a two way lumbar support assembly that is fitted to the seat
backrest and inflates an air filled bladder to give the required support. The electrical functions
can be utilized by operating the front seat control switch and then the driver seat position can
be stored by the driver door module (DDM). The driver seat can be programmed for up to
three different driver seat configurations and the seat memory switch located in the driver
door switch pack, can be used to retrieve the programmed configurations.

In addition to the standard front seat functionality the 16 way high level front seat
incorporates:

•

a four way lumbar support assembly.

•

an extendible seat cushion.

•

head restraints incorporating video display (optional).

Seat Base Motors

Item Part Number

Description

1

Height adjustment motor

2

Seat cushion tilt motor

3

Seat cushion extend motor

4

Forward and rearward adjustment motor

Item Part Number

Description

1

Front seat head restraint motor

2

Front lumbar motor

3

Front seat recline motor

Rear Seats

Front Seat Backrest Motors

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1

Seat armrest

2

Rear seat control switch

3

Rear seat cushion

4

Rear outer seat backrest

5

Rear seat head restraint

Depending on the vehicle specification the rear seats will be one of the following:

•

Fixed bench style with an integral armrest.

•

Electrically adjustable outer seat backrests with a bench style cushion and separate
armrest.

•

Electrically adjustable twin rear seats with a full floor console.

The standard rear seat is of a bench type with full width removable cushion and integral
armrest.

The electrically adjustable outer seat backrests can be fitted with either a bench style cushion
that incorporates both the rear seat control switches or single rear seat cushions that
incorporate the rear seat control switch for the corresponding side.

Rear Seat Backrest Motors

Item

Part

Number

Description

1

Rear seat recline motor

2

Rear seat head restraint motor

3

Rear outer seat backrest heater pad (incorporated into the rear outer seat

Item Part Number

Description

backrest cushion)

4

Rear outer seat backrest heater pad (incorporated into the rear outer seat
cushion)

5

Rear lumbar motor

The rear outer seat backrests are equipped with electric four way lumbar adjustment, rear seat
head restraint adjustment, and rear outer seat backrest recline adjustment motors. The
electrical functions can be utilized by operating the rear seat control switches and then rear
outer seat backrest positions can be stored by the rear seat module (RSM). The rear outer seat
backrests can be programmed for up to three different seat configurations each. The seat
memory switch located on the rear door trim panel can be used to retrieve the programmed
configurations.

Lumbar Motors

The front and rear seats have a two or four way lumbar motor system depending on the
specification of the vehicle. The system uses a single motor driven pump, which inflates or
deflates air cells, as required, to provide upper and lower lumbar support. The lumbar motors
are operated from the seat control switches. Depending on the direction the switch is operated
in, one of four solenoids housed within the solenoid pack (integral component of the lumbar
assembly) is connected to the pump, which provides lumbar support by adjusting the amount
of air in the appropriate cell.

Heated Seats

The heated seat system is available on all the seats except the standard rear seat option.

The heated seat system comprises of:

•

heated seat switches.

•

backrest heater pad.

•

cushion heater pad and thermostat.

•

front electronic module (FEM).

The FEM controls the seat heating function by providing the appropriate response depending
on the status of the heated seat switches. The heated seat functionality is constantly monitored
by the electronic load management system (ELMS). The ELMS dictates that in circumstances
where the generated electrical power is less than the electrical consumption, selected systems
may be inhibited or operated using reduced power for as long as is necessary.

With the ignition in the `ON` position, pressing a heated seat switch will select the maximum
heat setting for the chosen seat and is confirmed by three illuminated light emitting diodes
(LED) next to the switch. A second press selects the intermediate heat setting and two LEDs
are illuminated next to the switch. A third press selects the lowest heating setting, which is
displayed by one LED illuminating and a fourth press will deactivate the heated seat.

If the heated seat function has been activated, it will continue to operate until one of the
following conditions is met:

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