Audi A3 1997 - Page 28

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Indicated on display Desired function Fault remedy
Air flow flap positioning motor -
V71 1)
- Positioning motor -V71 moves from
stop to stop (fresh air blower operat‐
ing, temperature flap set to "warm",
air distribution to windscreen).
Air throughput changes (air flow
flap), air conditioner switches be‐
tween fresh air and recirculated air
mode (recirculated/fresh air flap)
- Check wiring between -V71 and -
E87 for open circuit or incorrect in‐
stallation according to current flow
diagram.
Check freedom of movement of air
flow flap and fresh/recirculated air
flap.
Check positioning motor -V71 (=>
Electrical check, Page 46 ).
Renew operating and display unit -
E87.
Temperature sensor blower -V42
(with an operating and display unit
-E87 with two displays)
- Blower -V42 (for temperature sen‐
sor in the dash panel) is switched on
and off in 5 sec. intervals
(smoke is drawn in by blower) 2).
- Use current flow diagram to check
the wiring between -V42 and operat‐
ing and -E87 for open circuit or short
to earth.
Use current flow diagram to check
power supply for -V42.
Check intake frame and intake hose
for blockage (=>Page 46 ).
1) This positioning motor also controls the recirculated/fresh air flap in addition to the air flow flap.
2) Check function of blower -V42, using smoke test, for example (hold smoke source in front of the intake
frame in the centre part of the dash panel).
Indicated on display Desired function Fault remedy
Segment test
(with an operating and display unit
-E87 with two displays)
- All segments of operating and dis‐
play unit -E87 are switched on and
off in 3-second intervals.
- Renew operating and display unit
-E87.
Ambient temperature indicator -
G106 (in the auto-check system)
- The ambient temperature display
(in auto-check system) counts in as‐
cending order starting at -45 °C or°F
(approx. 3 sec. per step).
- Use current flow diagram to check
the wiring between the auto-check
system and -E87 for open circuit or
short circuit.
Use current flow diagram to check
positive and earth connection to -
G106 for open circuit.
Check auto-check system.
=> Electrical System; Repair group
01
Renew operating and display unit -
E87.
Segment test
(with an operating and display unit
-E87 with one display)
- All segments of the display of the
operating and display unit -E87 are
switched on and off at 1 second in‐
tervals.
- Renew operating and display unit
-E87.
Note:
With operating and display units with one display the ambient temperature display -G106 are activated before
the segment test.
Indicated on display Desired function Fault remedy
Idling speed regulation 1) - The operating and display unit -E87
output is switched from 0V to 12V at
5 sec. intervals (check =>Page
23 ).
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
22 01 - Self-diagnosis, Electrical check