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Reading Lights
This switch powers the reading
light circuit enabling passengers
to operate their personal reading
lights. Refer to "Coach Interior"
chapter.
CAUTION
To avoid running down the batteries when the
engine is off, turn off the lights or connect an off-
board battery charger.
Brightness Control
Adjusts the brightness of the
dashboard
switches.
Wiper And Washer Control Switch
Push the control to activate
the
Turn the button to activate
the
position
wipers intermittently. The
second position is the slow
speed
position is for high speed
wiping.
HVAC PASSENGER'S UNIT
The passenger's area HVAC unit (central unit)
has a preset temperature of 68°F (20°) and is
fully automatic. It turns on at starting of the
engine. No inputs are required from the driver to
control the passenger's HVAC unit.
DOB 1300-1556
instruments
and
windshield
washer.
wipers.
The
first
activates
the
and
the
third
PA-1639 Operator's Manual 2020 X3-45 Commuter
Controls and Instruments 4-17
NOTE
Upon starting of the vehicle, when the ambient
temperature is very cold in and out of the vehicle,
the HVAC control unit will permit a temperature
overshoot up to 3° over the passenger's area set
point to help warming up of the area because
some parts of the vehicle like the seats and the
overhead compartments accumulate cold.
HVAC DRIVER'S CONTROL UNIT
FIGURE 16: CONTROL UNIT FOR DRIVER'S HVAC
SYSTEM
NOTE
It is recommended to run engine at fast idle to
operate the air conditioning system when
vehicle is stationary.
This will improve A/C compressor performance
and provide adequate electrical power to the
multiple A/C system fans.
When the system is running, keep roof
ventilation hatch and door closed to prevent
cooling loss.
To prevent battery run-down, the central A/C and
heating systems will not operate if the charging
system is not working properly.
When the A/C system is running, park at least 4
feet from other vehicles or buildings to allow
sufficient air flow through the condenser core.
The driver's HVAC unit may be turned ON by
pressing the ON/OFF button.
Also, the driver's HVAC section turns on
automatically at engine start and uses the
settings that were kept in memory before turning
off of the system.
The HVAC module performs a self- diagnosis
every time it is turned ON. Codes are shown on
displays or flashed on control buttons. Refer to
"Maintenance Manual" for more information on
the diagnostic codes
The A/C compressor starts automatically when
the two following conditions are satisfied:
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Troubleshooting
