Vanden Plas (X300) L6-4.0L (AJ16) (1996)
Control Assembly: Description and Operation
Climate Control Panel Operation
Climate Control Panel Operation
Climate Control Panel
The following description of the various control panel functions is provided as a brief over-view to assist in function checking. Further information
concerning the control panel to component interface may be found in the fault finding procedures (this section) or the Electronic Diagnostic Manual
(EDM).
NOTE: The system may be activated by any one of four commands. a) AUTO button item 11; b) DEFROST button item 12; c) A/C button item 10; d)
OFF switch item 1.
1. Combined push for OFF and rotary FAN SPEED control. The speed of the two fans is changed by clockwise (to increase) or anticlockwise
rotation of the knob. Operation of the control, (push) OFF or (rotate) FAN over-rides the AUTO selection and cancels the 'AUTO' display.
2. RECIRCULATE AIR push-on/push-off button and state lamp, used to prevent outside air being drawn into the cabin. There are two modes:
a) Press and immediate release; provides timed recirculation of five (5) minutes.
b) Press and hold for two (2) seconds; 'latches' the mode until operator over-ride.
3. Temperature scale SELECTOR for Celsius or Fahrenheit.
4. FANS SPEED display bar graph.
5. TEMPERATURE numeric display for demand and exterior.
6. Selected temperature SCALE temperature numeric display.
7. EXTERIOR temperature option display.
8. AUTO selection display.
9. EXTERIOR temperature selection button. There are two modes:
a) Press and immediate release; provides timed display of four (4) seconds.
b) Press and hold for two (2) seconds; 'latches' the mode until operator over-ride.
10. A/C push-on/push-off button will either engage or disengage (as indicated by the state lamp) the refrigeration system compressor. The state lamp is
also used as a compressor speed fault indicator, see System protection. See: Compressor HVAC/Compressor Clutch/Description and Operation
11. AUTO push-on button and state lamp. When selected and the state lamp lit, the A/C mode is selected and control of demand temperature, fans
speed, and air distribution is automatic. AUTO is cancelled by selection of any 'distribution' button, A/C off, or manual FANS SPEED.
12. DEFROST push-on/push-off button and state lamp. When engaged, air is distributed to the screen at maximum fans speed and the heated front
screen elements (where fitted) are energized. The heated front screen is automatically timed for a six (6) minute cycle but may be cancelled by
pressing the HEATED FRONT SCREEN button. Automatic temperature control is retained and the fans speed may be manually reduced.
Deselection will return the system to the previous state and selection of AUTO will resume automatic system control.
13. The push-on/push-off (F) button with state lamp manually controls the HEATED FRONT SCREEN (where fitted). This facility allows rapid
screen de-icing using laminated electrical heating elements to supplement the hot air defrost.
14. The push-on/push-off (R) button with state lamp manually controls the HEATED REAR SCREEN and door mirror glass heating elements for a
timed cycle of; screen twenty (20) minutes and mirrors eleven (11) minutes.