Porsche P-80 2005, Manual

Page: 75 / 108

Cayenne Model System
Climate Control Systems Diagnosis & Repair
Page 4.17
Solar Sensor
Solar intensity is detected by two photo diodes in the
stereo solar sensor. The solar sensor is able to measure
the sun’s intensity separately from the left and right sides.
The system reacts to changes in solar intensity after time
delays of typically 50 seconds with increasing solar
intensity and 200 seconds with decreasing solar intensity.
This prevents unnecessary adjustments by the automatic
A/C system in response to transient conditions.
The sensor is supplied a 5.0 Volt reference voltage. An
increase in sensed solar radiation causes the Climate
Control Unit to command an increase in blower speed. The
solar sensor is located on the top of the dash in the
center.
Air Control Flap Position Sensors
Automatic Climate Control system air control flap motors
have feedback position sensors built-in. Each position
sensor is a potentiometer which provides an analog signal
to the Climate Control Unit for flap position.
2-Zone Sensors
There are 7 air control flap position sensors in the 2-Zone
Cayenne air distribution housing:
• Fresh air/recirculation flap position sensor
• Defrost flap position sensors
• Middle vent position sensors
• Side vent position sensors
• Floor vent position sensors
• Temperature flap position sensors (L&R)
4-Zone Sensors
There are 18 (including rear) air control flap position
sensors in the 4-Zone Cayenne air distribution housings:
• Fresh air/recirculation flap position sensor
• Defrost flap position sensor
• Middle vent position sensors (L&R)
• Side vent position sensors (L&R)
• Floor vent position sensors (L&R)
• Temperature flap position sensors (L&R)
• Rear temperature flap position sensors (L&R)
• Rear air flap position sensors (L&R)
• Rear middle vent position sensors (L&R)
• Rear side vent position sensors (L&R)
Notes: