Part 2

Seats

Easy Entry/Exit
The 'Easy Entry/Exit' mode provides automatic movement of the steering column to allow easier entry to or exit from the vehicle.

NOTE:
If the adjustment switch is moved during entry/exit operation, steering column movement will stop.
When the ignition is in the on mode and the vehicle smart key is sensed by the Keyless Vehicle Module (KVM), the steering column, door mirrors and driver's seat will return to the stored position relating to that smart key. If, however, the memorized driver position has been changed (using the seat memory switches or another smart key transmitter), the steering wheel, door mirrors and the seat will move to the new stored memory position.
When the ignition is in the off mode, the steering column will move to the uppermost rake to allow easier exit from the vehicle cabin.

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 while that axis motor is being driven.
If a stall condition is detected, then the drive to that axis 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 axis motor may be activated again, to move past the stall position, by re-selecting the appropriate switch. 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.
For all seat motor and steering column manual movements, whenever a motor is driven and a stall occurs, the seat 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 seat control module's 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.

REAR SEATS
The switches for electrically adjusting the rear seat backrest are located in the rear door trims. Two versions of the switch are available; one lo-line switch with one switch for rear back rest adjustment and one switch with rear back rest adjustment, lumbar adjustment and a rotary switch for climate control. The switch corresponding to the front passenger seat is fitted with a front seat forward/backwards switch to allow for legroom adjustment.
On vehicles with non-climate, non-electric adjustment heated rear seats, the rear seat heaters are selected by switches on the rear of the floor console and controlled by the ATC (automatic temperature control) module.
On vehicles with electric adjustment, non-climate seats, the rear seat heaters and electrical adjustment are selected by switches located in the door trims.
On vehicles with electrical adjustment and climate control the climate seat controls and electrical adjustment are selected by switches located in the door trims.
On vehicles with electric and climate controlled rear seats, the power supplies for the motors and climate functions are supplied from the front seat memory control module. On vehicles with a passenger front seat without the memory function, the seat memory control module is still fitted to the front passenger seat to supply the power for the passenger side rear seat functions. The seat memory control module is connected to the rear seat control switch and controls the movement of the rear seat via hard-wired connections to the motors.

Rear Seat Control Switch









Heated Rear Seats - Non-Climate Seats
The rear seat heater elements are located in the outboard seat cushions and backrests. The cushion and backrest heater elements are wired in series. The cushion heater element has an input feed from the floor console mounted climate switch pack and an output to the backrest heater element, which outputs to ground.
The seat heaters are thermostatically controlled and will operate intermittently to maintain a predetermined temperature. The indicators in the switches will remain illuminated until the heaters are either manually turned off, or the ignition is in the off mode.
Feedback of the seat temperature is via a NTC (negative temperature coefficient) sensor within the seat cushion. The resistance of this sensor changes with the temperature of the seat cushion and a signal relating to the temperature is used to raise or lower the voltage to the seat heater elements to raise or lower their temperature.
Operation of the heated rear seat elements is controlled by the switches on the floor console climate switch pack. Two push-button seat heater switches are mounted in the switch pack. Each switch has 2 integral LED (light emitting diode)'s to display the level of heating selected. The switch can be pressed once to select the seat back rest heater or twice to select both the seat backrest heater and the seat cushion heater. The appropriate LED (light emitting diode)'s will illuminate to show which elements have been selected.
2 Zone Climate Control
The rear seat heater elements are connected directly to the climate switch pack in the floor console. The switchpack receives power supplies from the ATC (automatic temperature control) module and also supplies a rear heat temperature signal to the ATC (automatic temperature control) module. The ATC (automatic temperature control) module uses the temperature signal to regulate the power supplied to seat heater elements and control their temperature.
4 Zone Climate Control
The rear seat heater elements are connected to the climate switchpack in the floor console. The switchpack receives power supplies from the RJB (rear junction box) and it also has a LIN (local interconnect network) connection to rear ATC (automatic temperature control) module which is located under the front passenger seat. The rear ATC (automatic temperature control) module controls the power supply to the rear seat heater elements via a CAN (controller area network) message to the RJB (rear junction box) which regulates the power supplied to the rear seat heater elements and control their temperature.

Heated/Cooled Rear Climate Seats









Vehicles with rear climate seats have rotary climate controls located in the switch packs mounted in the door trim of each rear door. A rear seat climate module controls the functions of the climate seats. The heating and cooling functions of the climate rear seats operate using 2 Peltier cells; one in the seat cushion and one in the seat backrest. The climate functions of the seats are only active when the engine is running to preserve battery power.
The controlling software for the rear climate seats is contained with the rear seat climate control module, located under the RH (right-hand) side of the rear seat cushion. The module is connected to other vehicle system on the medium speed CAN (controller area network) bus. The module receives climate rotary switch temperature selections as PWM (pulse width modulation) signals and push button switch selections as ground path completions to the relative front seat memory control module. The front seat memory control module then transmits medium speed CAN (controller area network) bus messages to the rear climate module which then controls the rear seat heating/cooling Peltier cells to achieve the required seat temperature.

Rear Seat Climate Control Module





Both climatic rear seats contain two Peltier cells; one in the cushion, one in the backrest. The Peltier cells are able to deliver heating and cooling based on a voltage provided by the climate module. Each seat also contains a fan, which blows air over the Peltier cells to distribute heating or cooling throughout the seat. The Peltier effect occurs when an electrical current is passed through a junction formed by two dissimilar conductors, creating a heat pump. A heat pump absorbs heat from one side of the system, causing it to cool, and then transfers the heat to the other side, causing it to warm. The cell is capable of cooling the incoming air by approximately 8°C (12.4°F), which means that temperature output will depend on the ambient temperature inside the vehicle.
The climate module monitors seat heating through a NTC (negative temperature coefficient) temperature sensor. The temperature sensor is only used to monitor seat heating. Seat cooling is open loop, with no temperature signal provided back to the climate module. When a temperature selection is made through either of the rotary controllers, the ATC (automatic temperature control) module switchpack provides a medium speed CAN (controller area network) bus message to the climate module as a temperature value and attempts to heat or cool the seat accordingly.
The rotary control switch LED (light emitting diode)'s will illuminate if a selection is made when the ignition is in the on mode, but the Peltier cells will not operate until the engine is running. After the ignition is in the off mode, the climate module will retain the current temperature settings for approximately 15 minutes. After this period, the seats will be set to 'off' when the ignition is in the on mode.

Electric Rear Seats









The rear seat backrest can be adjusted for rake and also lumbar support using switch pack controls located in the rear door trim panel. The passenger side switch pack also contains an additional switch allow the rear seat occupant to move the front seat forward or backward to increase or decrease the rear leg room.
A motor and gearbox located in each of the rear seat backrest latches adjust the rake of the backrest in response to a request from the door switch pack. The switchpack receives a power supply from the CJB (central junction box). When a switch is operated the switch pack outputs a message on the LIN (local interconnect network) bus to the applicable front seat memory control module. The memory module then outputs the required power supplies to the seat motors to power them to the required position.
Each seat motor has four electrical connections; motor incline and recline, position sense and position sensor ground. The seat motor is operated using power supplies from the applicable front seat memory control module. The polarity of the power supplies is switched to provide the incline/recline functions. A position sensor sends signals back to the memory control module to prevent excessive seat movement.
The rear seats also have a lumbar adjustment in the backrest. This is a similar system to that used for the front seat. A 4-way switch lumbar control switch is located in the rear door switchpack and controls the operation of the backrest lumbar pump and valve block solenoids.