Land Rover Defender: Seats - [+] 7 Seat Configuration - Operation

FRONT ROW SEAT - VEHICLE WITHOUT SEAT MEMORY

A switched power supply from the Rear Junction Box is used to operate the front row seat switchpacks.

On vehicles without seat memory, the seat switchpacks are connected directly to the seat adjustment motors.

Operating 1 of the adjustment switches on the seat switchpack initiates the corresponding motor for that axis until the switch is released. Only 1 seat motor can be driven at 1 time in Power Mode 6 (ignition ON).

FRONT ROW SEAT - VEHICLE WITH SEAT MEMORY

On vehicles with seat memory, the DSM or PSM receives 2 power supplies. The permanent power supply from the PJB is used to operate the adjustment motors. The switched power supply from the Rear Junction Box is used to operate the DSM.

A switched power supply is connected from the Rear Junction Box to the driver seat switchpack. The driver seat switchpack is connected to the DSM by a LIN to control the seat adjustment. Any selection for seat adjustment generates a message which is transmitted to the DSM through the LIN. The seat module processes the request and operates the applicable seat motor as required using the power supplies from the PJB.

The DSM is connected to the HS CAN body systems bus. The system allows the DSM to monitor the position of the door mirrors and the steering wheel column. when storing and recalling seat memory settings, the DSM using the signals from:

• DDM
• PDM
• BCM/ GWM.

The HS CAN body systems bus allows modules to relay seat memory information to enable confirmation chimes and message display in the IPC.

Memory settings are stored in the DSM by pressing the seat memory switch and then, within 5 seconds, 1 of the channel switches. When the memory switch is pressed the seat memory switchpack status indicator illuminates in the switch. After the channel switch is pressed, the seat memory switchpack status indicator extinguishes and a chime sounds to confirm that the settings have been memorized. When in Power Mode 6 (ignition ON), the message center displays a confirmation message. Any previously stored settings on the selected channel is over-written.

Seat memory settings are recalled by pressing the applicable channel switch.

4-WAY LUMBAR AND BOLSTER - IF EQUIPPED

The lumbar switch is a 4 way switch located in the seat switchpack. Power supply is provided for the lumbar assembly from the seat switchpack.

The 4 way lumbar switch controls both the lumbar air pump and the solenoid valve. When the switch is moved to the inflate position, power is supplied through the seat relay contacts to the air pump motor. The air pump motor operates for as long as the switch is held in the 'inflate' position, or until the maximum pressure is achieved. When the switch is moved to the 'deflate' position, power is supplied to the solenoid valve. The purpose operates to open the valve to deflate the lumbar assembly air cell.

STALL DETECTION

A seat adjustment motor is deemed to have stalled when there is no change in the input from the corresponding motor position sensor for 200 ms.

When a stall condition is detected, the drive to the corresponding motor is:

• canceled for the remainder of the memory recall operation.
• The switch is re-selected (manual movement).

The motor must be activated again, to move past the stall position, by operating the appropriate switch for more than 2 seconds. When feedback is detected from the motor position sensor, then the motor continues to operate until the switch is released. When feedback is not detected from the motor position sensor, the motor is operated only for 0.5 second. Then stops until the switch is released and pressed again, when a further 0.5 second of activation is permitted. Known as inch mode, which allows seat adjustment when feedback from the seat motor position sensors are lost.

INITIALIZATION

When the DSM or the PSM is replaced, it must be calibrated using JLR approved diagnostic equipment. The module can learn the positions of the adjustment motors.

STARTUP BATTERY MONITORING

When the startup battery voltage drops below 10.5V, the DSM ignores all requests for a memory recall. The back to normal until the startup battery voltage has reached 11.5V. The startup battery conserves as much power in the startup battery as possible to enable engine cranking.

SEAT HEATER - IF EQUIPPED

The seat heater operates when in the Power Mode 7 (engine running). Power for the heater is supplied from a comfort relay in the Rear Junction Box. The comfort relay is controlled by a hardwired signal from the BCM/ GWM. Each seat cushion heater is connected through a LIN to the HVAC control module. The seat cushion heater also controls the power supply to the backrest heater mat.

When the HVAC control module receives a seat heating request, it sends a LIN message to the appropriate seat cushion heater to request the heater elements to be powered ON. The HVAC control module provides a target temperature to the heated seat mat LIN node. The LIN node uses the thermal sensor in the seat cushion heater element to regulates the temperature of the heated seat mat against this target temperature.

CLIMATE SEAT - IF EQUIPPED

Depending on vehicle specification, climate controlled front and second row seats are available for the power operated seats. The climate assembly is incorporated within each climate seat cushion and backrest.

The SCMEs in vehicle comprise of:

• SCME - Right
• SCME - Left
• SCME - Rear right
• SCME - Rear left.

The modules are connected to the HVAC control module on the LIN. Power supply for the climate assemblies in the seats are supplied from the Rear Junction Box. The climate assemblies can only operate when in the Power Mode 7 (engine running).

The FCDIM request is transmitted to the HVAC through the HS CAN HMI systems bus. The HVAC processes the requests and transmits them to the related climate module on a LIN connection.

The climate module uses the signals from the sensors in the backrest and the cushion, climate assemblies to regulate the seat at the selected temperature. When full seat heating/cooling is selected, both the backrest and the cushion climate assemblies are activated.

FOLDING AND RAISING MANUAL SECOND ROW SEATS

WARNING: Make sure the locking mechanism is fully engaged when the seatback is raised. During an accident or sudden maneuver an unsecured seatback could cause an injury to the seat occupant.

NOTES:

• Before folding or raising rear seats, make sure any rear installed screens are not in the movement path of the folding seat. Damage may occur to the seat or the screen as a result of the two colliding.

Before folding or raising a rear seat, make sure the rear seatbelt(s) are fully retracted and positioned against their respective D pillars.

• The second row center seatbelt incorporates a locking feature. The locking feature prevents the seatbelt from being pulled out too far when the backrest is folded flat.

  The seatbelt operates as normal if resets the feature when:

  1. Return the backrest to the upright position.
  2. Extract the seatbelt webbing until it stops.
  3. Return the seatbelt webbing a small amount.

To fold a second row backrest:

1. Push the button on the side of each head restraint. Fold the head restraints forward.
2. Lift the lever on the side of the seat and pull the backrest forward until it locks into the lowered position.

Raising and reclining the second row seats

To raise a second row backrest:

1. Lift the lever on the side of the seat.
2. Raise the backrest into the upright, locked position. Make sure that the backrest firmly locks into the upright position.
3. Raise the head restraints to the upright, locked position.

To recline the second row backrest: Lift the lever on the side of the seat and push the backrest into the reclined position.

To reset the backrest into the upright position: Lift the lever and pull the backrest forward into the upright position.

Make sure the backrest firmly locks into the upright position.

Third row seat access position

WARNING:

• The vehicle must not be driven with the second row seats in the access position. Vehicle motion could cause the seatback to fall forward suddenly, potentially causing injury.

Make sure nothing is trapped beneath a seat when returning it from the access position. During an accident or sudden maneuver an unsecured seatback could cause an injury to the seat occupant.

When the seat and seatback are returned from the access position, make sure the locking mechanisms are fully engaged. Physically test to make sure that the seat and seatback are secure before driving. During an accident or sudden maneuver an unsecured seatback could cause an injury to the seat occupant.

To access or exit the third row seats:

1. Pull the lever on the top of the backrest upward to release the locking mechanism. Move the backrest forward into the tilt position.
2. Pull the seat into the fully forward position.

Sliding the second row seats (7 seat vehicle)

To slide the seat forward:

1. Pull the seat into the fully forward position.
2. Pull up on the lever at the front of the seat.

FOLDING THE CENTER BACKREST

WARNING: Make sure that you have read and fully understood the relevant warnings before using any of the features in this section.

NOTE: In an emergency, use the centre seatback to exit the third row seats.

To fold the center backrest: Press the release button on the top of the backrest. Fold the center backrest forward into the lowered position.

To raise the center backrest: Lift the center backrest until it firmly locks into the upright position.

FOLDING AND RAISING THE THIRD ROW SEATS

WARNING:

• Make sure that you have read and fully understood the relevant warnings before using any of the features in this section.
• The head restraint must always be raised when using the third row seats. The head restraint must be positioned correctly to restrain rearward movement of the head in a collision or sudden stop.
• Do not allow passengers to travel in the third row seats when the second row seats are in the folded or third row access position.
• Make sure the seatbelts are correctly routed and not trapped behind the seats when raising the rear seatbacks. An incorrectly routed seatbelt may not properly restrain an occupant during a collision or sudden stop.
• Beware of trapping fingers when raising and lowering a third row seat. Failure to do so creates a risk of entrapment and serious injury.
• Take care when retrieving items that have fallen down the side, back, front or underneath the seat. Sharp objects may be present in these areas, which could present a risk of injury. Always stop the vehicle before retrieving items.

CAUTION: The seat is heavy, so care should be taken when raising the seat.

• Check the second row seats are not fully reclined, if they are, then rotate forward using side handle.
• To recline the second row backrest: Lift the lever on the side of the seat and push the backrest into the reclined position.

1. From inside the loadspace, pull the strap on the rear of the backrest. Lift the seat into the raised position.
2. From inside the passenger compartment, lift the head restraint, until it locks in the upright position.

CAUTION: The seat is heavy, so care should be taken when lowering the seat.

To fold a third row seat:

1. From inside the loadspace, pull the strap on the rear of the seat to release the head restraint locking mechanism. Fold the head restraint forward.
2. Pull the strap to release the seat locking mechanism. Fold the seat forward.

DIAGNOSTICS

The BCM/ GWM records any Diagnostic Trouble Code(s) (DTC)s and related data. Read the DTCs and related data with the JLR approved diagnostic equipment.

The JLR approved diagnostic equipment enables certain components to be activated and also live data to be read.

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