Seating: Other Jaguar XKR II

AUDIBLE AND VISUAL CONFIRMATIONS

A single chime audible confirmation is generated by the instrument cluster to provide confirmation to the driver that the memory store operation has been successfully completed.

In addition to audible confirmation there is also a visual confirmation via the instrument cluster message center. Refer to Instrument Cluster and Panel Illumination article.

Scheme 42

The instrument cluster controls the electric adjustable steering column in a rake (up and down) and reach (in and out). The steering column can be adjusted for rake and reach by operating the rotary joystick control switch on the LH side of the steering column.

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.

This mode is selected by setting the steering column adjustment switch to the 'AUTO' position.

If the 'Easy Entry Exit' feature fails to function, it can be activated as follows

1. Rotate the steering column adjust switch to the 'AUTO' position
2. The instrument cluster will now display 'Column Adjust Auto' in the message center

For more information refer to the owners handbook.

Steering Column Control

Adjustment of the steering column is achieved by a single Direct Current (DC) motor. Each adjustment movement is transmitted through a solenoid actuated clutch; 1 clutch for reach movement and 1 for rake movement.

When engaged, a clutch can be released only if the system is unstressed. As the clutches are mounted on the same motor spindle, the sequence for position adjustment is as follows

1. Engage the selected clutch by powering the appropriate solenoid
2. After a time period (approximately 0.1 of a second), the motor is powered in the desired direction. When the motor reaches the stop position the solenoid and motor is released/unpowered. The clutch remains engaged under stress
3. At the start of the next adjustment the motor is powered in the opposite direction to enable the clutch to disengage when the stress is released.

Simultaneous rake and reach movements are not possible since the motor must reverse direction as soon as the first axis has reached its required position.

Steering column rake and reach is controlled via potentiometer feedback.

Scheme 43

The memory control module, located under the drivers and passengers seat, relies upon a number of inputs to control various outputs. As with all electronic control modules, the unit needs information regarding the current operating conditions of the engine and other related systems before it can make calculations, which determine the appropriate outputs.

Scheme 44

Note. A = Hardwired; N = CAN bus; O = LIN bus

Scheme 45

Note. A = Hardwired; N = CAN bus; O = LIN bus

Drivers Memory Seat

The memory control module can store up to 3 different driver seating, mirror and steering column positions. The numbered memory and single memory store switches control memory storage and recall operations. Each switch is a momentary action push switch.

Scheme 46

Memory Store

Drivers Seat

Once the driver's seat, steering column and exterior mirrors have been adjusted, the vehicle is able to memorize these settings for future use by using the following procedure

1. Push the memory button M, the red Light Emitting Diode (LED) will illuminate for five seconds
2. While the LED is illuminated, press button 1, 2 or 3 to memorize the current settings

The LED will extinguish, and a chime will sound to confirm that the settings have been memorized. If the ignition is in the 'ON' mode, the message center will display a confirmation message.

Passenger Seat

The procedure to memorize a passenger seat position is the same as that for the driver's seat with two exceptions. There will be no chime or message to confirm the settings.

Memory Recall

Memory recall has 3 memory positions stored for the seats, steering column and exterior mirrors. The switches for this function are located on driver and passenger door side trim panel. Pressing the appropriate numbered memory switch allows the seat to start moving to the position appropriate to that memory. When the switch is released the system will operate in manual mode. This means that when the switch is released, the seat will stop moving. In order to reach the intended memory position, the switch must not be released until all movement has stopped.

When a memory recall is initiated, to limit the overall current consumption, only 2-seat axis will move towards their intended position at any one time.

Both mirrors move simultaneously about the vertical axis first (left/right), and then, once all vertical axis movements are complete, about the horizontal axis (up/down). To minimize the number of mirror drives required, a method of sharing is implemented, which dictates that all movement about 1 axis is complete before movement about the other axis commences.

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 for 200 ms (seat).

If a stall condition is detected then the drive to that axis 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 may be activated again, to move past the stall position, by re-selecting the appropriate switch and pressing for longer than 2 seconds. 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, this is known as inch mode.

For all seat motor manual movements, whenever a motor is driven and a stall occurs, the 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 control modules 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.

Initialization

When a replacement memory control module is fitted to a seat it should be calibrated via IDS diagnostic tester so that the control module can learn the seats absolute position.

Battery Monitor

If the battery voltage drops below 10.5 Volts, then the memory control module ignores all requests for a memory recall until the battery voltage has reached 11.5 Volts. This will conserve as much power in the vehicle battery as possible to enable engine cranking.

Stand-by Mode

The memory control module supports a stand-by mode to keep power consumption to a minimum.

If the control module is being prevented from entering stand-by mode due to motor movement, memory recall or switch operation, then it will enter stand-by mode when the current function has terminated.

Note. In the case of a memory recall, all memory recall operations should be carried out before entering stand-by mode, not just the current motor movement.

The control module will exit stand-by mode if there is any CAN bus activity.

The exchange of information between the diagnostic unit and the memory control module is via the medium-speed CAN bus. There is a non-volatile Electronic Erasable Programmable Read Only Memory (EEPROM) for saving detected errors. Its contents are not lost when the power supply is disconnected. Only the IDS diagnostic tester can erase the error memory.