Control Components: Other Jaguar XKR I рестайлинг

System Controls

The climate control system is controlled by

1. Manual input from the operator, via the center console located control panel.
2. Automatically by means of the A/CCM.

Output is based upon input from the following devices

1. Motorized In-car aspirator
2. External air temperature sensor
3. Coolant temperature sensor
4. Heater 'air-off' (the temperature of the air leaving the matrix fins) temperature sensor
5. Evaporator 'air-off' (the temperature of the air leaving the evaporator fins) temperature sensor
6. Solar sensor
7. Left hand blower recirculation / fresh air flap potentiometer
8. Right hand blower recirculation / fresh air flap potentiometer
9. Upper air distribution box (ADB) center and side face flap servomotor potentiometer
10. ADB defrost flap servomotor potentiometer
11. Air conditioning unit Foot flap servomotor potentiometer
12. Air conditioning unit Cool Air Bypass flap servomotor potentiometer
13. Center vent assembly temperature differential potentiometer
14. Thumbwheel controls on the facia vent assemblies which provide manual adjustment of the airflow volume.
15. Road and engine speed signals input to the A/CCM

Climate Control Panel

Communication between the control panel and the A/CCM is via a serial data communications link.

Scheme 7

Switching the Climate Control system ON

The climate control system can be switched ON by pressing one of the following

Ref #1 On / Off (resumes the system on in the previous settings).

Ref #10 A / C (resumes the system on in the previous settings).

Ref #11 AUTO (resumes the system on at the previous temperature setting).

Ref #12 DEF (resumes the system on at the previous temperature setting).

Button (switch) logic

All buttons with an integral LED state lamp conform to the following operating logic.

When the state lamp is lit the relevant function is operational. From this condition, pressing the button will de-activate the function, confirmed by the LED being de-energized and the presence of a single audible 'beep'. A single 'beep' will accompany the state lamp to confirm function re-selection.

1. ON / OFF and manual fan speed. Pressing this knob activates the system ON at the last setting or switches the system OFF. Rotate the knob clockwise to increase and anti-clockwise to decrease fan speed and thus airflow. With the system OFF, ram air is available by the selected air distribution mode (indicated by state lamp). Air flow will NOT occur unless a manual air distribution mode is selected, this air being unconditioned and flow dependent upon vehicle speed. NOTE: The blowers are inhibited until the engine coolant temperature is > 35°C, unless DEFROST is selected.
2. Manual Air Recirculation Closes the outside air intakes of the blower assemblies and recirculates air within the vehicle. Two options of control are available : Timed Recirculation. Pressing the button for less than 1.5 seconds lights up the LED (confirmed by a single beep). This provides recirculation of interior air for a period of approximately 5 minutes. Pressing the button within five minutes returns the system to fresh air intake mode. Continuous Recirculation. Pressing and holding the button for more than 1.5 seconds lights up the LED (confirmed by two beeps). This provides continuous recirculation of interior air. Pressing the button returns the system to fresh air intake mode. NOTE: Avoid using manual air recirculation for prolonged periods in cold weather, this may result in interior misting of glass.
3. Temperature Scale Selection Press the appropriate button to display temperatures in degrees Celsius or Fahrenheit.
4. Manual Fan Speed Rotating the fan speed control knob (to vary fan speed) will display a proportional number of horizontal bars on the LCD. There are total of eleven manual fan speeds available.
5. Temperature Display Indicator of internal demand temperature or external ambient temperature. The external ambient is updated every 4 seconds when the road speed > 25 km / h.
6. Scale Selected temperature scale, Celsius or Fahrenheit.
7. External temperature Symbol indicates when this option is selected
8. Automatic Symbol indicates when the control of, temperature, fan speed and air distribution are all in Auto mode.
9. External There are two modes of external ambient temperature selection; Quick Display. Pressing the button for <1.5 seconds (confirmed by a single beep) will display the external temperature for 4 seconds. Continuous Display. Pressing and holding the button for >1.5 seconds (confirmed by two beeps) displays the external ambient temperature continuously, the value of which will be updated every 4 seconds given that vehicle road speed is > 25 km/h. Pressing the button again for <1.5 seconds resets to the previous display. NOTE: Continuous external temperature display will be cancelled when the ignition is switched OFF but not during engine cranking.
10. A/C This push-on / push-off button will either select or deselect (as indicated by the state lamp) the refrigeration system. The refrigeration system is automatically engaged when the Auto button is pressed. NOTE: Interior misting of screens may be reduced by continuous operation of the refrigeration system.
11. Auto When selected and the state lamp lit, A/C mode will be operational and control of vent outlet temperature, fans speed and air distribution will be automatic. AUTO mode will disengage should manual air distribution or defrost buttons be operated or the manual fan speed knob be rotated. NOTE: Automatic temperature control is constantly maintained irrespective of selected manual overrides.
12. Defrost Push-on push-off button, which when engaged will direct all air to the front and side glass at maximum fan speed. The heated windshield (if fitted) will also be energized for a timed cycle of 6,5 minutes, but may be cancelled by pressing the HEATED WINDSHIELD (F) button. Pressing 'DEF' again will return to the last setting with automatic temperature control being maintained. Directing warm and humid air onto a cold screen can produce interior misting of screens. Operating the climate control system without the refrigeration system operating will exacerbate this problem. NOTE: Directing cold air onto the screen in warm humid conditions can produce external condensation.
13. Heated Windshield (F) Pressing the heated windshield button (where fitted) will energize the electrically heated windshield elements for a timed cycle of 6,5 minutes; pressing the button again will cancel the request. Should the engine stall or the ignition be turned OFF, the timer will be cleared and the function cancelled. NOTE: The heated windshield may be activated with the climate control system OFF but the engine must be running. In very cold ambient temperatures, icing of the interior of the glass is possible when the climate control system is operating in AUTO mode; to reduce this possibility the A/CCM provides automatic operation of the heated windshield. With the following conditions met, the heated windshield will automatically energize but the state lamp will NOT be lit. External temperature < 0 °C Vehicle speed > 48 km / h The first two conditions exist > 2 minutes. Engine speed > 50 revs / min
14. Heated Backlight (R) Pressing the heated backlight button will simultaneously energize the heater elements for timed cycles of; 21 minutes backlight 11 minutes exterior mirrors Pressing the button again within the 21 minute timer will cancel the request. If the engine is stalled, or the ignition switched OFF, the backlight and door mirror timers will be cleared, resulting in both functions being switched off. NOTE: Both the backlight and door mirrors may be activated with the climate control system OFF, but the engine must be running.
15. Temperature Decrease Pressing this button (BLUE symbol) decreases the interior temperature setting in 1° increments. Should the button be pressed when the setting temperature is below the lower automatic control temperature limit, the display will indicate 'LO'.
16. Temperature Increase Pressing this button (RED symbol) will raise the temperature setting in 1° increments Should the button be pressed when the setting temperature is above the upper automatic control temperature limit, the display will indicate 'HI'. Automatic Temperature Control Range °C °F LO LO 17 61 62 18 63 64 19 65 66 20 67 68 21 69 70 22 71 72 23 73 74 24 75 76 25 77 78 26 79 80 27 81 82 28 83 84 29 85 86 30 87 88 31 89 90 HI HI LO demands the maximum COOLING performance from the system with the blowers operating automatically at maximum speed. HI demands the maximum HEATING performance from the system with the blowers operating automatically at maximum speed. Pressing and holding either temperature selection button continuously changes the setting temperature by steps of 1°, every 0.4 seconds. NOTE: The interior temperature does not change when the temperature scale is changed between Celsius and Fahrenheit, however the temperature display will change to the nearest equivalent number. Examples: 17C 61F 17C 66F 19C 66F NOTE: When operating in HI or LO mode and the AUTO button is pressed, the system will adopt the nearest automatic control temperature setting: LO AUTO DISPLAY INDICATES 17° C or 61° F HI AUTO DISPLAY INDICATES 31° C or 90 ° F NOTE: When switching the system on using the AUTO button, the system will display the previous temperature setting, except under the following conditions: LO, system OFF, auto display indicates 17° C or 61° F HI, system OFF, auto display indicates 31° C or 90° F
17. Face Pressing this button will direct all airflow to the center and side face vents only; pressing again will return the system to automatic control mode. NOTE: When in AUTO mode and in a hot climate, a bleed of cold air is delivered to foot level. This bleed automatically shuts off when the interior temperature has cooled sufficiently.
18. Bi-Level This push-on / push-off button will direct air to the center and side face vents and the front footwells. Pressing the button (off) will return the system to automatic control mode.
19. Foot This push-on / push-off button will direct the majority of airflow to the front footwells with a small bleed of air to the front and side screens. Pressing the button (off) will return the system to automatic control mode.
20. Demist

Pressing this button will direct air to the front and side screens and the front footwells. Pressing the button (off) will return the system to automatic control mode.

Scheme 8

The center vent assembly incorporates the Temperature Differential control thumbwheel. This control provides adjustment of the outlet air temperature from the center and end of dash vents (EOD), relative to the foot duct air temperature. The air temperature from the face vents air will increase when the thumbwheel is rotated upwards and decrease when rotated downwards.

Note. The face level air temperature is always cooler than the foot air temperature and the temperature differential control ONLY operates when the system is in AUTO or manual Bi-Level mode.

Only the center face air vent assembly incorporates the three listed controls; the EOD vents, not shown, only feature items 2 and 3.

Initial setting

Should a new A/CCM be fitted, it will 'power-up' in the OFF mode; switching ON will result in the following settings

After initial start up the system operating conditions will be stored in the A/CCM to the conditions which prevailed prior to ignition OFF.

Maximum Heating (temperature setting HI)

Maximum Cooling (temperature setting LO)

Scheme 9

The A/CCM is located on the right hand side of the air conditioning unit and controls all system functions.

The temperature within the passenger compartment is continually compared with the temperature selected on the control panel LCD. The A/CCM receives data input signals and compares these with signals from the system temperature sensors and feedback devices. Based on this information the A/CCM adjusts the air outlet temperature, airflow and distribution from the air conditioning system into the passenger compartment.

Scheme 10

Inputs / Outputs

1. Engine speed: Input to the A/CCM from the ECM. Heated windshield and backlight will be inhibited when engine speed < 50 RPM.
2. Vehicle speed: Input from the instrument cluster. Blower speed control to minimize the effects of ram air. Road speed compensation is inhibited when maximum cooling LO, or maximum heating HI, is selected; also inhibited in defrost mode with airflow set to maximum. Used to determine the frequency at which the exterior temperature display is updated.
3. Coolant temperature (signal derived from ECM via instrument cluster): Input from the heater matrix temperature sensor used to control water valve and thus vent temperatures. Used to monitor the temperature of coolant at the heater matrix to assist the control of air outlet temperature. Used to inhibit the blowers when heating is selected and the engine coolant temperature is below 30°C. Is used to provide progressive increase in blower speed up to 60°C. To inhibit the water valve and pump when the coolant temperature is = < 10°C
4. Compressor ON signal

1. Input to the A/CCM from the compressor relay output.
2. Used to determine compressor fault conditions.

Scheme 11

The solar sensor is mounted on the top surface of the fascia between the driver's defrost grille and speaker grille.

The sensor is a photo-diode which is calibrated to measure direct sunlight. It provides an output signal to the A/CCM which automatically reduces air temperature and increases fan speed (airflow volume) to compensate for solar heating.

Scheme 12

This thermistor device changes electrical resistance as a result of temperature variations.

The sensor is positioned next to the evaporator fins and measures air temperature after it has passed through the evaporator. The sensor inputs a signal to the A/CCM which controls the compressor (see table) when the refrigeration system is operating.

The sensor's connector is located on the LH side of the air conditioning unit, in front of the main power connector.

The A/CCM disengages the compressor clutch when the temperature of the air off the evaporator is 2° C or less. This is to prevent the moisture which may collect between the cooling fins of the evaporator from freezing and thus restricting airflow.

Scheme 13

The heater matrix temperature sensor is a thermistor which changes its electrical resistance in response to changes in air temperature converting a temperature rating to an electrical signal.

The sensor connector is located on the RH SIDE of the air conditioning unit. The sensor bead is located inside the unit down-stream from the heater matrix and measures the 'post-heater' air temperature, before the air is distributed to the cabin The sensor provides a signal to the A/CCM which adjusts the duty ratio of the water valve to provide the required air temperature from the heater.

Scheme 14

The sensor is a thermistor which changes its electrical resistance in response to changes in air temperature, converting a temperature rating to an electrical signal.

The ambient temperature sensor measures exterior air temperature and is mounted on the RH horn bracket which is located on the front bumper beam.

The signal from the ambient sensor allows the A/CCM to compensate for the ambient conditions and to display the information on the control panel - updated every four (4) seconds.

Sensor response is 'damped' by the A/CCM and therefore does not appear to react to temperature changes as quickly as the other sensors. This feature prevents the effects of sudden changes in air outlet temperatures due to factors such as

1. Recirculating air from the engine cooling pack at low vehicle speeds
2. Sudden changes in ambient temperature
3. The effects of water splash

Scheme 15

Cabin air is drawn through a grille (located near the steering column on the knee bolster) over a thermistor. Remotely mounted from the thermistor is the motorized aspirator with a rubber hose which connects both components.

The electrical resistance of the thermistor changes in response to variations in air temperature and converts this temperature rating into an electrical signal; the signal is used by the A/CCM to adjust the temperature, airflow and air distribution from the air conditioning unit.

Coolant Temperature Signal.

This signal is supplied to the A/CCM from the instrument cluster, the input being required to

1. Provide blower inhibit control , to avoid the system in heating mode delivering cold air when the coolant temperature is below 35C unless DEFROST is selected.
2. To progressively increase the fan speed up to maximum blower speed during warm up control.
3. To assist in the control of the outlet temperature.
4. To avoid possible pump or valve damage caused by ice particles in the coolant.

Compressor ON Signal.

This signal monitors the compressor relay to confirm the compressor operating state and so provide relevant fault information.

Servo Motor Control.

Flap position, which directs the flow of air through the system, is controlled by servo motors; these may be driven in either a clockwise or anti-clockwise direction by signals from the A/CCM. Motor, thus flap position, is monitored via a feedback potentiometer which is situated within the motor housing.

Servo motors control the following flaps

1. RH and LH Air Intake (Fresh / Recirc)
2. Center Vent
3. Defrost
4. Foot
5. Cool Air Bypass

Blower Motor Control.

The A/CCM controls the speed of two blower motors which deliver airflow to the air conditioning unit. The blower motors are regulated by power transistor modules which provide a linear variation of blower speed.

Relationship Manual Control Blower Speed / Voltage

Note. Blower motors are inhibited when the engine coolant temperature is below 35C and heating is demanded, unless DEFROST is selected.

Scheme 16

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Control Panel Communication

The control panel provides operator interface with the climate control system.

Control panel operation is described in detail in the D section.

Control Panel Inputs / Outputs

A/CCM Connections

Control Panel Interrogation Procedure

The control panel has a self-diagnosis feature, and is capable of displaying and clearing stored fault codes.

Climate control is an integrated system, therefore it is recommended that the PDU is used for fault diagnosis. The fault codes displayed with the control panel self-diagnosis feature are not as comprehensive as those of the PDU. The PDU will display the relevant fault code, fault code description and information of the system peripherals at the time the fault occurred.

Fault Code Extraction and Deletion Procedure

Error information is stored in the A/CCM up to a maximum of 5 faults. Should a sensor fault occur there will be an audible beep and the message Er will be displayed on the control panel display for 5 seconds after ignition on. Please note that this will happen only once in any ignition switch cycle. The error source may be accessed by the following procedure

This procedure must be completed through one complete cycle, 1 through 6

Note. * Actuator codes do NOT equate to system fault codes.

Note. Only codes 11, 15 and 21 (see Fault Code Listing) will cause audible beep and 'Er' display.

Note. If '0' is displayed, there are no stored fault codes, wait 30 seconds to allow system self-test.

1. The control panel display will flash repeatedly indicating a list of two digit numbers (see table for code analysis).
2. Should a code be displayed accompanied by an audible beep, the fault is current and therefore still present within the system. A code displayed without an accompanying 'beep' indicates a fault had previously occurred but is not present within the system.

Note. It is advisable to check all areas indicated with cleared fault codes. Such faults may re-occur if intermittent problems are present in the system.

1. To delete stored and cleared fault codes press 'R' and 'FACE' buttons simultaneously.
2. After investigating and correcting all stored faults, press the 'Push Off' button to restore normal operation with default panel settings, ie AUTO at 24°C.

Control Panel Fault Code Listing

Note. Reference fault code #23*: In ambient temperatures below 0°C, this code may be logged because the low ambient causes a temporary low gas pressure.

Note. Where the ambient temperature rises above 40°C, with the engine close to overheating, electrical feed to the compressor clutch may be cut and code #23 registered.

Control Panel Fault Code Listing

Associated Faults

Other conditions which may exist but will NOT log fault codes

Associated Faults

Panel Communication Check

The panel communication check verifies the inputs and outputs from the control panel to the A/CCM.

Actuator Check Procedure

The system self test procedure drives all the actuator motors, to check their operation. If an actuator is operating incorrectly or operating outside of its limits then a fault code will be present.

Before commencing with the actuator check procedure, ensure the car is operating under normal conditions.

1. Switch ignition OFF.
2. Press and hold the RECIRC and AUTO buttons simultaneously, switch ignition ON and run the engine.
3. All the control panel LEDs and all LCD segments will flash on and off. Any function LED indicator which does not flash on / off suggests a fault condition within that area of the panel or, with the LED. Any LCD element which fails to flash on / off indicates a fault within the display element or panel.
4. Press AUTO
5. Press RECIRC button to instigate actuator check mode.
6. Press FACE to cycle through the actuator mode conditions 20 to 27.
7. Press the FAN button to restore normal operation with default panel settings, ie AUTO @ 24°C.

Actuator Fault Codes

Note. * The water valve operates on a 6 second pulse, ie 3 seconds ON, 3 seconds OFF.

Scheme 21

Scheme 22

Scheme 23

1. Remove heater matrix for access.
2. Detach sensor connector from heater / cooler assembly. Disconnect connector.
3. Detach clip and sensor from evaporator. Remove clip.
4. Remove sensor from heater / cooler assembly. Remove clip. Lever case apart sufficient enough to withdraw sensor through aperture.