Land Rover Defender: Seats - [+] 5 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 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 the ignition is 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 2-WAY 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 will operate 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', power is supplied to the solenoid valve, operates to open the valve to deflate the lumbar assembly.

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 bus 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 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.

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 control module 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 THE SECOND ROW SEATS

NOTE:

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 when:

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

Folding the second row seats

The split-folding rear backrests can both be folded to accommodate large loads, or partially folded to accommodate large loads and still retain seating for passengers.

To fold a second row backrest:

1. Push the button on the side of each head restraint. Fold the head restraints forward.
2. Pull the backrest release catch and manually lower the backrest.

NOTE: Head restraints need to be removed to achieve the maximum vehicle loadspace, when equipped on flip flop seat on 5 door vehicles.

A latch hook is positioned beside the release catch to guide the seatbelt away from the seat edge when lowering and raising the backrest.

The center rear backrest can be released separately. To release the center rear backrest, press and hold the release button. Simultaneously fold the backrest forward.

NOTE:

To fold down the seats to fully horizontal level:

• For vehicle with 3 doors: Fold down the head restraint.
• For vehicle with 5 doors: Fold up the cushion and remove the head restraint and insert into the cushion.

Raising the second row fixed seats

To return the second row backrest and reset the backrest into the upright position.

To raise a rear head restraint, manually lift the head restraint until it locks firmly into the upright position.

NOTE: A red indicator is visible beside the release mechanism if either the rear or rear center backrest is not fully locked into place.

RAISING THE SECOND ROW FLIP FLOP SEAT

NOTE:

A red indicator is visible beside the release mechanism if either the rear or rear center backrest is not fully locked into place.

1. Return each backrest until in the fully upright position and it locks firmly.
2. Remove the head restraints from the locations in the cushion.

1. Flop the cushion in place and lock it onto the frame pan.
2. Mount the head restraints to the backrests and use the button on the side of each head restraint to raise the head restraints to the upright, locked position.

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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