Porsche P-80 2005, Manual

Page: 45 / 108

Sports Cars System
Climate Control Systems Diagnosis & Repair
Page 3.11
Operation (automatic climate control panel)
A - Seat heating (left / right)
The air conditioning system is operated by way of a A/C
Control Unit with integrated control unit in the center
console. The control panel differs visually from that on the
previous Boxster (986) models because of the addition of
a new control interface.
The main changes to the control panel are:
• Integration of the interior temperature sensors
(previously in the dashboard on the passenger’s side)
• Integration of the switches for heating the driver’s and
passenger’s seats (previously in the center console).
• Integration of the button for heating the rear window
(previously located beside the operating unit)
• Introduction of switches for adjusting the temperature
and fan power (higher setting = switch up, lower setting
= switch down).
• “ECO” marking (ECOnomy mode) on the button for
switching the air conditioning compressor on and off
(snowflake symbol on display goes on /off accordingly).
As a result of these changes, all of the heating functions in
the vehicle are now together in a single unit.
Control Panel
Information is displayed by means of an LCD display and
signalling lights (LEDs) in some buttons. When “LO” or “HI”
appear on the display of the a/c control unit, this indicates
that the system is operating at maximum cooling or
heating power (the temperature control function is deacti-
vated). “LO” and “HI” are displayed by the nominal temper-
ature value segments.
“OFF” on the display indicates that the fan is off.
A - Seat Heating on/off
The seat heating settings can be adjusted individually for
the left (button A) and right (button G) side. Apart from OFF
level, two heating levels can be selected. When the appro-
priate button is pressed, the air conditioning control unit
(control panel) transmits the altered button status (pressed
1x or 2x) to the vehicle electrical system control unit. The
vehicle electrical system control unit controls the heating
elements in the seat directly (heating-up phase) and
reports the relevant heat status (setting 2 or setting 1)
back to the control panel. This heating status is indicated
to the user via the LED in the seat heating button.
The operating time during the heating up phase is
based on the interior temperature (CAN signal)
according to the selected heat setting:
• Level 2 (at 104° F. (40° C) to <-4° F. (-20° C) from 2.2
to a maximum of 11.0 minutes
• Level 1 (at 104° F. (40° C) to <-4° F. (-20° C) heats from
0.5 to a maximum of 9.2 minutes
After the heating up phase the control unit switches to the
continuous heating phase. The vehicle electrical system
control unit now reduces the heating power of level 2 to
40 % and level 1 to 14 %.
B - Windshield
The defrost function can be activated immediately in all
operating modes. On activation of this function, the
temperature is switched to “HI”, the air flow rate is
increased and the air is distributed primarily towards the
windscreen. ECO mode is additionally ended, if the intake
temperature conditions (fresh air intake temperature
sensor >37° F.
(3° C) permits. If the compressor cannot be activated,
recirculation air mode will be started.
C - Recirculation Mode
1 – Mode of functioning of manual recirculation
mode
The fresh/recirculated air distributor flap can be
activated at any time to prevent odour nuisance.
However, recirculation mode is limited to max. 3
minutes when the air conditioning compressor is
switched off (ECOnomy mode).