OVERVIEW
A number of front seating options are available. An 8-way electrically adjustable driver's seat is complemented by an 8-way electrically adjustable passenger seat. A 10-way electrically adjustable driver's seat is complemented by an 10-way electrically adjustable front passenger seat. A 16-way electrically adjustable driver's seat is complemented by a 12-way electrically adjustable front passenger seat.
On non-memory seats, the operation of the seats is controlled directly from the driver's seat switchpack. On memory seats, the operation of the seat motors is controlled by a seat control module which is located on the underside of the driver's seat frame.
The driver's seat is fitted with a seat position sensor which is located on the seat rail. The sensor is used by the restraints control module (RCM) to determine the seat position and adjust the inflation time of the airbag deployment accordingly. Refer to Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) information.
SYSTEM OPERATION AND COMPONENT DESCRIPTION
| Item Number | Description |
|---|---|
| Note | A = Hardwired; O = local interconnect network (LIN) |
| 1 | Battery |
| 2 | Battery junction box (BJB) |
| 3 | Seat switch pack |
| 4 | Lumbar support solenoids |
| 5 | Lumbar support motor |
| 6 | Seat memory switches |
| 7 | Squab recline motor |
| 8 | Driver's seat module |
| 9 | Head restraint motor |
| 10 | Cushion tilt motor |
| 11 | Cushion extension motor |
| 12 | Seat slide motor |
| 13 | Seat height motor |
| 14 | Central junction box (CJB) |
| Item Number | Description |
|---|---|
| Note | A = Hardwired |
| 1 | Battery |
| 2 | Battery junction box (BJB) |
| 3 | 2-way Lumbar support |
| 4 | Seat switch pack |
| 5 | Squab recline motor |
| 6 | Cushion tilt motor |
| 7 | Seat slide motor |
| 8 | Seat height motor |
| 9 | Central junction box (CJB) |
| Item Number | Description |
|---|---|
| Note | A = Hardwired; N = Medium speed controller area network (CAN) bus; P = MOST ring |
| 1 | Battery |
| 2 | Battery junction box (BJB) |
| 3 | Automatic temperature control (ATC) module |
| 4 | Rear junction box (RJB) |
| 5 | Touch Screen Display (TSD) |
| 6 | Information and Entertainment module |
| 7 | Front seat climate control module |
| 8 | Passenger seat squab climate module |
| 9 | Drivers seat cushion climate module |
| 10 | Passenger seat cushion climate module |
| 11 | Drivers seat squab climate module |
| 12 | Passenger seat cushion heater element |
| 13 | Passenger seat squab heater element |
| 14 | Drivers seat cushion heater element |
| 15 | Drivers seat squab heater element |
| 16 | Central junction box (CJB) |
HEATED SEATS - OPERATION
Heated Front Seats
The TSD receives a fused power supply from the rear junction box (RJB). One of the 3 seat heat temperature selections made by the driver or passenger using the TSD soft keys are passed from the TSD on the MOST ring to the Information and Entertainment module. The information and entertainment module processes the information and transmits the request on the medium speed controller area network (CAN) bus to the automatic temperature control (ATC) module.
The cushion heaters have a thermal sensor which supplies a feed back signal back to the central junction box (CJB). The squab heater elements do not have a thermal sensor and are maintained at the same temperature as the seat cushion elements.
The automatic temperature control (ATC) module reacts to the driver request information received from the information and entertainment module and requests the central junction box (CJB) to activate the seat heaters. The central junction box (CJB) measures the returned temperature signals from the thermal sensors and relays the temperature signals back to the automatic temperature control (ATC) module. The automatic temperature control (ATC) module then uses the measured seat element temperatures to provide closed-loop control of the heater elements to maintain the temperature at one the 3 heat ranges selected.
Note. To prevent excessive battery discharge, the heated front seats will only operate when the engine is running.
Heated and Cooled Front Seats
The TSD receives a fused power supply from the rear junction box (RJB). Selections made by the driver using the TSD soft keys are passed from the TSD on the MOST ring to the Information and Entertainment module. The information and entertainment module processes the information and transmits the request on the medium speed controller area network (CAN) bus to the front seat climate control module. The front seat climate control module is located beneath the right-hand (RH) front seat, on the floor cross member.
The front seat climate control module receives its power supplies from the central junction box (CJB). Heating and cooling requests are generated using the soft buttons on the TSD. These requests are transmitted to the information and entertainment module over the MOST ring. The Information and Entertainment module forwards these requests to the front seat climate control module over the medium speed controller area network (CAN) bus.
The front seat climate control module supplies power to the two climate modules in each seat. The temperature sensor in each climate module is monitored by the front seat climate control module which uses the temperature information to control the Peltier cells accordingly and also the blower fans to distribute the heated or cooled air.
Note. To prevent excessive battery discharge, the heated and cooled front seats will only operate when the engine is running.
Electric Driver's Seat Adjustment - Non-Memory Seats
The central junction box (CJB) supplies 3 power supplies to the driver's seat switchpack. The fused supplies provide power for the seat height and squab recline, the seat slide and seat tilt and the lumbar adjustment respectively. The central junction box (CJB) only provides the power to the driver's seat switch pack when the ignition is on (power mode 6).
For the seat movement motors, when the applicable switch is operated, the power is supplied to the applicable side of the motor and the ground path is completed to operate the motor in the required direction. To move the motor in the opposite direction the polarity is reversed.
For the lumbar adjustment, when the switch is operated in the inflate position, power is supplied to the pump motor to inflate the lumbar support. When the switch is operated in the opposite direction, the power energizes a solenoid which in turn opens a valve to deflate the lumbar support.
Electric Passenger Seat Adjustment (8, 10 and 12 way)
The central junction box (CJB) supplies 3 power supplies to the passenger seat switchpack. The fused supplies provide power for the seat height and squab recline, the seat slide and seat tilt and the head restraint and lumbar adjustment respectively. The central junction box (CJB) only provides the power to the passenger seat switch pack when the ignition is on (power mode 6).
For the seat movement and head restraint motors, when the applicable switch is operated, the power is supplied to the applicable side of the motor and the ground path is completed to operate the motor in the required direction. To move the motor in the opposite direction the polarity is reversed.
For the lumbar adjustment, when the switch is operated in the inflate position, power is supplied to the pump motor to inflate the lumbar support. When the switch is operated in the opposite direction, the power energizes a solenoid which in turn opens a valve to deflate the lumbar support.
Electric Driver's Seat Adjustment - Memory Seats (10 and 16 way)
The central junction box (CJB) supplies 3 power supplies to the driver's seat module and one supply to the driver's seat switch pack. The fused supplies provide power for the movement motors in addition to the driver's seat switch pack. Power is only supplied to the driver's seat module and the driver's seat switch pack when the ignition is on (power mode 6).
The driver's seat switch pack is connected to the driver's seat module by a local interconnect network (LIN) bus for the seat movement switches. Any selection for seat movement generates a message which is passed via the local interconnect network (LIN) to the driver's seat module. The seat module processes the request and operates the applicable seat function as required using the power supplies from the central junction box (CJB).
Each seat motor contains a Hall position sensor. The sensor sends a feedback signal to the driver's seat module. The signal is used for memory store and memory recall functions.
The lumbar adjustment switch on the driver's seat switch pack is wired direct to the lumbar pump and solenoids. The switch, when moved to the inflate position for either the upper or lower inflatable cushion cell, provides a power supply to the lumbar pump and simultaneously activates the applicable inflate solenoid valve. When the switch is released the pump stops and the solenoid valve closes trapping the air in the inflatable cushion. When the switch is moved to the deflate position for either the upper or lower inflatable cushion cell, power is supplied to the applicable deflate solenoid valve which opens to allow the air in the cushion to escape. When the switch is released, the valve is closed and the remaining air in the cushion is retained.
FRONT SEATS - DESCRIPTION
The table below highlights the features available for each seating option.
| Seat Type | Non-Heated | Heated | Heated and Cooled | Lumbar Support | Memory |
|---|---|---|---|---|---|
| 8-way | Yes | Optional | No | 2-way | No |
| 10-way | Yes | Optional | Optional | 2-way | Optional (Driver's seat only) |
| 12-way | No | No | Yes | 4-way | No |
| 16-way | No | No | Yes | 4-way | Yes (Driver's seat only) |
Seat Heating
The 3-stage heated front seats feature 2 heater elements located in the seat cushion and a single heater element located in the seat squab. Operation of the heated front seats is controlled by the automatic temperature control (ATC) module via the TSD, information and entertainment control module and the central junction box (CJB) module on vehicles with heated seats. On vehicles with heated and cooled seats the operation is controlled by the TSD, information and entertainment control module and the front seat climate control module.
The heated and cooled front seats each contain 2 climate modules; one in the cushion, one in the squab. The climate modules contain 'Peltier' cells which are able to deliver heating and cooling based on a voltage provided by the front seat climate control module. Each climate module also contains a fan, which blows air over the Peltier cells to distribute heated or cooled air via liners in the seat cushion and squab. The fan is also controlled by the front seat climate control module. The TSD allows the driver and passenger to select 3 ranges of heated or cooled ventilation; off, minimum and intermediate. Also, using the selections on the TSD, the driver and passenger can select between full seat ventilation or squab backrest ventilation only.
Vehicles fitted with the 3-stage heated front seat option also feature a heated steering wheel. Refer to Steering Column Switches information.
REAR SEATS - DESCRIPTION
The rear seat features a single piece cushion and a 60/40 split squab. Two latches are secured to the rear bulkhead by a pair of M8 bolts to retain the seat squabs in the upright position. The latches can be released to fold down the individual cushions by pulling a cable release located below the rear window parcel shelf in the luggage compartment.
ISOFIX fastening points are attached to the vehicle floor to provide secure fastening for compatible child seats.
A centrally mounted center arm rest can be folded down from the 60% squab. The arm rest contains two drinks holders.
PRINCIPLE OF OPERATION
For a detailed description of the seats and seat operation, refer to COMPONENT LOCATION and SYSTEM OPERATION AND COMPONENT DESCRIPTION .
Pinpoint Test G: Heating And Cooling - Noisy Operation
Pinpoint Test G
- Check the Climate Controlled Seat Module for stored DTC's.
- WARNING: Before work is carried out, make the air bag supplemental restraint system safe. For additional information, refer to Standard Workshop Practices section of workshop manual.
- NOTE: The Climate Controlled Seat's (heat and cool) function will only operate when the vehicle's engine is running.
- NOTE: If a fault is identified and repaired, check for correct operation of the driver and front-passenger climate controlled seat (heat and cool) functions.
- There is a known issue which effects a limited number of vehicles where under acceleration of the vehicle the occupant of seat can deform the suspension mat (snake wire) which then presses on the casing of the seat backrest climate assembly, this causes the casing to distort and the noise issue to occur. If contact has occurred there will be a witness mark on the casing. Carry out visual inspection of the seat backrest climate assembly that has been identified as noisy by the customer.
- Operate the heat and cool function of the seat. Listen for a 'WAH WAH' noise (the fan speeds up and slows down repeatedly).
- Compare the noise level of the suspect climate seat assembly to another climate seat assembly.
Pinpoint Test I: Heating And Cooling - Heat Or Cool Operation Slow
Pinpoint Test I
- Check the Climate Controlled Seat Module for stored DTC's.
- WARNING: Before work is carried out, make the air bag supplemental restraint system safe. For additional information, refer to Standard Workshop Practices section of workshop manual.
- NOTE: The Climate Controlled Seat's (heat and cool) function will only operate when the vehicle's engine is running.
- NOTE: If a fault is identified and repaired, check for correct operation of the driver and front-passenger climate controlled seat (heat and cool) functions.
- Check the heat and cool function at the cushion.
- Check the condition of the bellows.
- Check the security of the bellows duct.
- Check the security of the bellows.
- Compare the operation of the suspect climate seat assembly to another climate seat assembly.
Pinpoint Test J: Heating And Cooling - Intermittent Operation
Pinpoint Test J
- Check the Climate Controlled Seat Module for stored DTC's.
- WARNING: Before work is carried out, make the air bag supplemental restraint system safe. For additional information, refer to Standard Workshop Practices section of workshop manual.
- NOTE: The Climate Controlled Seat's (heat and cool) function will only operate when the vehicle's engine is running.
- NOTE: If a fault is identified and repaired, check for correct operation of the driver and front-passenger climate controlled seat (heat and cool) functions.
- Identify from customer concern or stored DTC's which Seat Climate Assembly is operating intermittently and confirm the harness connector is fully connected.
PRINCIPLES OF OPERATION
Heated seats incorporate heater elements in the cushion and the backrest of the seat. Each cushion heater element has a thermal sensor, which supplies a feedback temperature signal to the related seat heater module. The backrest heater elements do not have a thermal sensor, and are regulated at the same temperature as the cushion heater elements.
For a detailed description of the seat heater mat, refer to COMPONENT LOCATION and OVERVIEW and SYSTEM OPERATION AND COMPONENT DESCRIPTION . .
For a detailed description of the seats and seat operation, refer to COMPONENT LOCATION and SYSTEM OPERATION AND COMPONENT DESCRIPTION .