Audi Q3: Sunlight Photo Sensor -G107-, Removing and Installing
Note
- The Sunlight Photo Sensor -G107- is only installed with an
automatic climate control system.
- Check the Sunlight Photo Sensor -G107- using the Vehicle
Diagnostic Tester in the "Guided Fault Finding" function, A/C
system.
Removing
- Using a 0.4 mm feeler gauge -1-,
carefully pry the photo sensor -3-
out of the top front defroster vent
-arrow-
- Disconnect the connector -2-.
Installing
Installation is done is reverse order, observe the
following:
After completing the repair work, perform the following
operations on the control head using the Vehicle Diagnostic
Tester in the "Guided Fault Finding" function:
- Check the DTC memory and delete any currently displayed
entries.
Function of Air Quality Sensor -G238-
Function of Air Quality Sensor -G238-
Note
Only on vehicles with an automatic climate control system
Function mode
- The Air Quality Sensor -G238- requires approximately 30
seconds to reach its operating temperature after the ignition is
switched on. During the warm-up phase, the function of the Air
Quality Sensor -G238- is limited.
- The Air Quality Sensor -G238- detects pollutants in the
surrounding air (usually gasoline and/or diesel exhaust) and
causes the Climatronic Control Module -J255- to switch the Air
Conditioning (A/C) system to recirculating air mode.
- The Climatronic Control Module -J255- control head
recognizes by the signal the type and intensity of the air
pollutant on the signal from the Air Quality Sensor -G238-.
Based on this information, the Climatronic Control Module -J255-
then determines if and when the A/C system switches to
recirculating air mode.
Example:
- At an outside temperature above approximately +2 ℃ (36 ºF),
the recirculation mode is switched on upon request from theAir
Quality Sensor -G238- when there is only a slight increase in
the pollutants in the ambient air.
- At an outside temperature between approximately +2 ℃ (36 ºF)
and approximately -8 ℃ (18 ºF), the change over to recirculating
air mode only occurs at a sharp increase of pollutant
concentration, during which the compressor is switched on
simultaneously.
- When the exterior temperature is less than approximately -8
℃ (18 ºF) and the A/C compressor is switched off, the change
over only occurs when there is an increase in the pollutant
concentration and only then for approximately 15 seconds.
- The indicator lamp in the AC or
A/C button does not light up.
- The maximum duration of the "Automatic recirculating air
mode" is limited to approximately 15 seconds by the Climatronic
Control Module -J255- so that the windows in the vehicle
interior do not fog up.
- If the concentration decreases, the A/C system switches to
the fresh air mode.
- "Automatic recirculating air mode" can be switched off at
any time. If the function is active, the A/C compressor is
switched on with a request for "automatic recirculating air
mode" and also when the outside air temperature is below +2 ℃
(36 ºF). If the temperature is below -8 ℃ (18 ºF), then it is
not possible to use the A/C compressor.
- At the "automatic recirculating air mode" setting on the
Climatronic Control Module -J255- A/C control head, the A/C
compressor can also be switched on by switching on the
recirculating air mode manually (via the
recirculation button) up to a temperature of
approximately -8 ℃ (18 ºF).
- To ensure that the A/C system does not operate constantly in
recirculation mode in areas with a consistently high pollution,
the Air Quality Sensor -G238- is self-adapting (it adjusts its
sensitivity to the environmental conditions).
- If the outside air pollution load remains relatively high
for a long period of time, the Air Quality Sensor -G238- starts
to adapt itself to the changing environmental conditions through
an adaptation program (learning program) so that the air
recirculation request in evenly polluted ambient air is
therefore generally shorter than 12 minutes. If a succession of
peaks in the polluted air is detected, the A/C system can
operate over a longer period of time in recirculating air mode.
- A certain amount of time is required for repositioning of
the air conditioning system doors. In the event that a sudden
increase in pollutants is encountered (e.g. when driving through
a diesel exhaust cloud) gaseous pollutants can be taken in with
the fresh air into the passenger compartment until the door can
be closed. For this reason, a dust and pollen filter is
installed with a charcoal layer. A filter that is saturated with
pollutants is no longer effective and needs to be replaced.
- To prevent excessive operation of the fresh air/air
recirculation doors, the door is not actuated immediately if
there is a nominal increase in pollutants in the surrounding air
(the Air Quality Sensor -G238- does not send a request to the
Climatronic Control Module -J255-). The filtering of the
charcoal insert in the dust and pollen filter will be
sufficient.
- In order to avoid frequent operation of the fresh air/air
recirculation doors, the request from the Air Quality Sensor
-G238- for "Automatic recirculating air mode" remains for at
least 25 seconds (minimum duration period), even if the
pollutant concentration is so far reduced that recirculating air
mode is no longer necessary.
- The Climatronic Control Module -J255- does not allow any air
circulation in "defrost" mode so that the window glass can defog
as quickly as possible.
- The Air Quality Sensor -G238- requires approximately 30
seconds to become operational once the ignition has been
switched on (warm-up time). There is no request sent to the
Climatronic Control Module -J255- control head for "Automatic
recirculating air mode" at this time.
- The Air Quality Sensor -G238- contains a highly sensitive
electronic component which can be damaged if it comes in direct
contact with solvents, fuels or chemicals. For this reason, do
not install sensors that may have come into contact with these
substances.
Air Quality Sensor -G238-, Checking
Note
Only on vehicles with an automatic climate control system
Special tools and workshop equipment
required
- Vehicle Diagnostic Tester
Test Prerequisites
- The vehicle is standing in a clean atmosphere.
- Away from running engines, exhaust vents, etc.
- The engine compartment and the plenum chamber are clean.
- Not contaminated with oil or fuel.
- The engine compartment and the plenum chamber were not
sprayed with cleaning agents or preservatives containing
solvents
- "Automatic recirculating air mode" is switched on.
Functionality, Checking
- Remove the Air Quality Sensor -G238-. The connector remains
connected. Refer to
→ Chapter "Air Quality Sensor -G238-, Removing and Installing".
Adjust the following settings on the Climatronic Control
Module -J255- control head:
- "Auto" mode - the indicator lamp in the
AUTO button -10-
illuminates.
- "Automatic air recirculation" - the indicator lamp in the
recirculation button
-11- illuminates.
- After a 30 second warm-up time the Air Quality Sensor -G238-
is ready to be used.
- Wait 30 seconds for the Air Quality Sensor -G238- to warm
up.
- Check the Diagnostic Trouble Code (DTC) memory for the
Climatronic Control Module -J255- control head and select "Read
measured values". Refer to Vehicle Diagnostic Tester in the
"Guided Fault Finding" function.
- Read the measured values for the Air Quality Sensor -G238-.
The Air Quality Sensor -G238- displays the operating condition
of the fresh air/air recirculation door and the signal.
- No request for "Recirculating air mode" is present - Air
Conditioning (A/C) system in fresh air mode.
or
- No request for "recirculating air mode" present - request
for "partial recirculating air mode" present (fresh air/air
recirculation door in the center position)
- Read the measured values for the Air Quality Sensor -G238-.
- Specified value: request for "Automatic recirculating air
mode" present, request is fulfilled - A/C system switches to
recirculating air mode.
- Wait a short period time (approximately one minute,
depending on amount of test gas flowing into the sensor).
- Read the measured values for the Air Quality Sensor -G238-.
- Specified value: no request for "Recirculating air mode"
present - A/C system in fresh air mode.
or
- Specified value: no request for "automatic recirculating air
mode" present - request for partial recirculating air mode
present.
Note
In order to avoid frequent operation of the fresh air/air
recirculation doors, the request of the Air Quality Sensor
-G238- for "Automatic recirculating air mode" remains for at
least 25 seconds (minimum duration period), even if the
pollutant concentration is so far reduced that recirculating air
mode is no longer necessary.
- Operate the switch for windshield wiper/washer system until
the Windshield Washer Pump -V5- has delivered fluid for
approximately 2 seconds.
- Read the measured values for the Air Quality Sensor -G238-.
- Specified value: Request for "Recirculating air mode"
because of windshield washer system present - A/C system
switches for approximately 10 seconds to the air recirculating
mode.
- Wait a short period of time.
- Read the measured values for the Air Quality Sensor -G238-.
- Specified value: no request for "Recirculating air mode"
present - A/C system in fresh air mode.
or
- Specified value: no request for "automatic recirculating air
mode" present - partial recirculating air mode active.
Note
- Depending on the composition of the windshield washer fluid,
the Air Quality Sensor -G238- is able to potentially determine
impurities in the air and request for "Automatic recirculating
air mode".
- If no changeover to recirculating air mode occurs when
operating the switch for the windshield wiper/washer system (the
information "wash windshield" is received via the Convenience
data bus system from the Steering Column Electronics Control
Module -J527-), check the function on the Vehicle Diagnostic
Tester in the "Guided Fault Finding" function.
- Install the Air Quality Sensor -G238-. Refer to
→ Chapter "Air Quality Sensor -G238-, Removing and Installing".
If the function of Air Quality Sensor -G238- is OK for this
test and there is a customer complaint, continue as follows:
- Check the dust and pollen filter for soiling. Refer to
→ Chapter "Dust and Pollen Filter, Removing and Installing".
- Select "Read measured values" using the Vehicle Diagnostic
Tester in the "Guided Fault Finding" function.
Note
A second person is required to read out values displayed
while driving.
Observe the safety precautions. Refer to Vehicle Diagnostic
Tester in the "Guided Fault Finding" Function.
- Alternately read out the displays in the "read measured
values" function for the measured values of the Air Quality
Sensor -G238- and the recirculation/fresh air mode request.
- Drive the vehicle into an area with a relatively clean
atmosphere.
- Target value: System operates in fresh-air mode.
- Then drive vehicle into an area where the atmosphere is
polluted (for example, onto an uphill road with truck traffic).
- Target value: The displays in the different display fields
must change; for example, when driving through a Diesel exhaust
cloud.
Note
Also observe the function descriptions of the Air Quality
Sensor -G238-. Refer to
→ Chapter "Function of Air Quality Sensor -G238-".
READ NEXT:
Removing
- Remove the plenum chamber cover. Refer to
→ Body Exterior; Rep. Gr.50; Bulkhead; Plenum Chamber Cover,
Removing and Installing.
- Release the securing tab -4
Note
Complaints may arise regarding the Air Conditioning (A/C)
system regulation if there is a faulty measured value for the
Outside Air Temperature Sensor -G17-. Refer to Vehicle
Diag
Humidity Sensor -G355-, Removing and Installing, Vehicles without
Driver Assistance Systems Front Camera
Note
Only on vehicles with an automatic climate control system
There are diff
SEE MORE:
Fig. 17 Center display: text input diagram with MMI Navigation plus 1/ MMI
Radio plus 2
Overview
In the input fields of the various menus, you can
enter letters, numbers, and characters, for example
to find a contact in the directory. The text input
display 1 or 2 depends on the vehicle
equipment.
The rear view camera system assists the driver when driving
in reverse by providing the driver with an image of the traffic
situation behind the vehicle via the Front Information Display
Control Head -J685-.
The rear view camera system is switched on when engaging the
reverse gear. The syst