Audi Q7: General Information for Actuators
Note
- Depending on vehicle equipment, there are different versions
of the A/C system for the Audi Q7. Make sure to use the correct
version and pay attention to the allocation of different
components. Refer to
→ Chapter "A/C System Versions" and Parts Catalog.
- For this vehicle, there are various actuators (-A-
through -N-) on the front heater
and A/C unit, under the instrument panel, on the rear heater and
A/C unit or on the rear air distribution housing that are
adapted and activated via data wires. The various actuators (-A-
through -N-) are connected to the
Front A/C Display Control Head -E87- / to the Rear A/C Display
Control Head -E265- in a row via these data wires (LIN bus 1,
LIN bus 2). If there is a malfunction in an actuator that is
connected via this data wire or if it is in the wiring, this
malfunction can result in various DTC memory entries with
different malfunction types. Refer to Vehicle Diagnostic Tester
in the "Guided Fault Finding" function and refer to
→ Wiring diagrams, Troubleshooting & Component locations.
- Depending on the vehicle equipment, many different actuators
are connected to the Front A/C Display Control Head -E87- or the
Rear A/C Display Control Head -E265- via the data wire (LIN bus
2). If there is a malfunction in an actuator that is connected
via this data wire or if it is in the wiring, this malfunction
can result in various DTC memory entries with different
malfunction types. Refer to Vehicle Diagnostic Tester in the
"Guided Fault Finding" function and refer to
→ Wiring diagrams, Troubleshooting & Component locations.
- There are currently seven actuators for the "Low" or "Mid"
A/C system and 15 actuators for the "Mix" or "High" A/C system
that are connected in series to the Front A/C Display Control
Head -E87- via the data wire (LIN bus 1). Refer to
→ Wiring diagrams, Troubleshooting & Component locations.
- For vehicles with a "Mid" or "Mix" A/C system, there are
currently four additional actuators (installed on the air
distribution housing under the center console) that are
connected in series to the Front A/C Display Control Head -E87-
via the data wire (LIN bus 2). Refer to
→ Wiring diagrams, Troubleshooting & Component locations.
- For vehicles with a "High" A/C system, there are currently
seven additional actuators (installed on the rear heater and A/C
unit under the center console) that are connected in series to
the Rear A/C Display Control Head -E265- via the data wire (LIN
bus 1). Refer to
→ Wiring diagrams, Troubleshooting & Component locations.
- For vehicles with a "High" A/C system, the actuators
installed on the rear heater and A/C unit (current quantity: 7)
are connected to the Rear A/C Display Control Head -E265- via a
data wire. These adjustment motors are activated in the same way
as the adjustment motors connected to the Front A/C Display
Control Head -E87- (also via this series connection). Refer to
→ Wiring diagrams, Troubleshooting & Component locations.
- The actuator sequence in the wiring is currently dependent
on the A/C system version (refer to
→ Chapter "A/C System Versions") and on the vehicle
version (refer to
→ Wiring diagrams, Troubleshooting & Component locations).
- In the "basic setting" function, only adapt the actuators
connected to the different data wires (LIN bus 1 and LIN bus 2
to the Front A/C Display Control Head -E87- and LIN bus 1 to the
Rear A/C Display Control Head -E265-) if there are no
malfunctions stored in the Front A/C Display Control Head -E87-
(or in Rear A/C Display Control Head -E265-) which have a cause
other than an actuator that is not adapted or is incorrectly
adapted. In addition, adapt the actuators one after the other
via the two data wires on the Front A/C Display Control Head
-E87-. If adapting the actuators connected to both data wires is
desired, check the DTC memory of the Front A/C Display Control
Head -E87- (and / or the Rear A/C Display Control Head -E265-)
after an adaptation was performed via a data wire. Only conduct
the adaptation operation via the second data line if the first
operation was completed successfully. If there is a malfunction
in one of the two data wires for the Front A/C Display Control
Head -E87-, it may no longer be possible, depending on the
malfunction, to determine in which of the data wires the
malfunction occurred, if the adaptation procedure was performed
immediately one after the other via both data wires for the
Front A/C Display Control Head -E87-. Refer to Vehicle
Diagnostic Tester in the "Guided Fault Finding" function.
Depending on the operating condition or the A/C system
Guided Fault Finding function where a certain malfunction
appears, the effect of the malfunction and the type of
malfunction stored in the DTC memory is different. Refer to
Vehicle Diagnostic Tester in the "Guided Fault Finding"
function.
- If there is a malfunction in the actuator sequence (two or
more connectors on the actuators or the actuators were
interchanged during installation)
- The function of the adjustment motors with interchanged
connectors may be OK until the next basic setting (addressing of
the adjustment motors). However, in the next basic setting,
these adjustment motors will be incorrectly adapted (addressed)
and the activation of the adjustment motors (and therefore the
doors) will now be incorrect (incorrect allocation).
- If the connectors at the adjustment motors are interchanged,
these adjustment motors are incorrectly adapted in the basic
setting (addressed) and the activation of the adjustment motors
(and thus the doors) is incorrect (incorrect allocation). In the
event interchanged connectors are suspected, check the wire
connections between the adjustment motors. Refer to
→ Wiring diagrams, Troubleshooting & Component locations.
- Depending on the adjustment range for this actuator, an
incorrect end stop is recognized during the basic setting and
this is stored as a malfunction in the event memory, and the
basic setting is terminated.
- If the wrong door moves, then the air flow direction is
incorrect. This is not always recognized as a fault depending on
the adjustment range of the actuator. Therefore, always label
all connectors and adjustment motors with the installation
location before disconnecting them, and perform a basic setting
after reconnecting them.
- If there is a malfunction in normal A/C system operation,
then the following DTC memory entries can result, depending on
the type of malfunction.
- If there is a malfunction in the positive or ground
connection to an actuator, this actuator can no longer exchange
information with the Front A/C Display Control Head -E87- (or
the Rear A/C Display Control Head -E265-) and this actuator is
stored in the DTC memory.
- If there is a malfunction in the data wire to an actuator
(for example, a short circuit in the connector to contact "2" of
the actuator -B-), then this
actuator and all actuators connected in series after this
actuator (-C through N-) can no
longer exchange information with the Front A/C Display Control
Head -E87- (or the Rear A/C Display Control Head -E265-) and
this actuator as well as all the other connected actuators are
stored in the DTC memory.
- If a malfunction occurs in the actuator electronics (for
example, in actuator -B-), the
actuator -B- may still be able to
exchange information with the Front A/C Display Control Head
-E87- (or the Rear A/C Display Control Head -E265-) depending on
the type of malfunction, however all the actuators connected
after this one (-C through N-) will
be stored in the DTC memory.
- If there is a malfunction during the basic setting of the
A/C system, then the following malfunction entries can result,
depending on the type of malfunction.
- If there is a malfunction in the positive or ground
connection to an actuator (for example, to actuator
-B-), then this actuator cannot
exchange information with the Front A/C Display Control Head
-E87- (or the Rear A/C Display Control Head -E265-) and it will
not be recognized during the basic setting. During the basic
setting, all the actuators from the last actuator beginning with
-N- are re-allocated and
re-assigned; this actuator is no longer in sequence. The Front
A/C Display Control Head -E87- (or the Rear A/C Display Control
Head -E265-) detects that an actuator is missing and stores the
first actuator in the series connection as missing. In addition,
the malfunction "automatic addressing malfunctioning" is
displayed and "upper or lower limit value exceeded" may
additionally be displayed for certain adjustment motors.
- If there is a malfunction in the data wire to an actuator
(for example, a short circuit in the connector to contact "2" of
actuator -C-), this actuator and
all actuators connected in the series after this one can no
longer exchange information with the Front A/C Display Control
Head -E87- (or the Rear A/C Display Control Head -E265-), and
these actuators are not recognized during the basic setting.
During the basic setting, all the actuators from the last
actuator beginning with -N- are
re-allocated and re-assigned; these actuators are no longer in
sequence. The Front A/C Display Control Head -E87- (or Rear A/C
Display Control Head -E265-) detects that several actuators are
missing (for example, only the actuators
-B--A- are detected as incorrectly assigned and adapted).
All other adjustment motors are stored as missing in the event
memory and the malfunction "automatic addressing malfunctioning"
is displayed.
- If there is a malfunction in the actuator electronics or one
occurs during the basic setting (for example, in actuator
-C-), this actuator may still be
able to exchange information with the Front A/C Display Control
Head -E87- (or the Rear A/C Display Control Head -E265-),
depending on the type of malfunction. However, data can no
longer be exchanged with all the actuators connected after this
one (up to actuator -N-). The Front
A/C Display Control Head -E87- (or Rear A/C Display Control Head
-E265-) detects that several actuators are missing (the
actuators -C through A- may only be
incorrectly assigned and adapted). All other adjustment motors
are stored as missing in the event memory and the malfunction
"automatic addressing malfunctioning" is displayed.
READ NEXT:
"Low" A/C System Version
Note
There are different versions of the Audi Q7 A/C system
depending on the vehicle equipment.
Identifying features of a "Low" A/C system version
Front A/C Display
Safety Precautions when Working on Start/Stop System
WARNING
The engine could start automatically and cause
serious personal injury on vehicles with a Start/Stop
System.
The engine may st
SEE MORE:
Component Location Overview - Injection System
Locations Engine Compartment
1 - Crankcase Ventilation Shut-Off Valve -N548-
2 - EVAP Canister Purge Regulator Valve 1 -N80-
3 - Coolant Recirculation Pump -V50-
Component location. Refer to → Fig. " Coolant Recir
The tachometer (2) displays the engine
speed in revolutions per minute (RPM). The beginning
of the red zone in the tachometer indicates
the maximum permissible engine speed for
all gears once the engine has been broken in. Before
reaching the red zone, you should shift into
the next higher gear, sel