ignition AUDI A4 1997 B5 / 1.G Climate Control Components In Passenger Compartment Workshop Manual

If 22 C (71 F) is always displayed after
switching on the ignition regardless of the last
setting, check voltage supply to E87 (terminal
30) using wiring diagram.

E87 readout can be switched over from C to
F and vice versa by pressing the "temperature
+" and "recirculating air" buttons
simultaneously.

If E87 remains in operation after switching off
the ignition, test cable connection to E87
connector -D- contact -1- for short circuit to
positive (connection for auxiliary heater
operation) using wiring diagram.
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87-121

Notes:

If both display fields do not light up with ignition
switched on, check coding of -E87- and conduct
electrical tests if necessary page 01
-135
.

For m.y. 1997, the illumination of the display
field and the operating button is via light
emitting diode (LED), and can not be replaced.
Always refer to parts information for correct
control head versions.
Control heads with part number 8D0 820 043
should only be installed in vehicles through m.y.
1996.
Control heads with part number 8L0 820 043
should only be installed in vehicles beginning
m.y. 1997.
A/C control head -E87- with Part No. 8D0 820
043 can only be installed in vehicles up to and
including m.y. 1996.
8L0 820 043B A4-
A/C fully automatic DXX
Codin
g XXXXX
WSC ZZZZZ

M.y. 1997 vehicles can only have A/C control head -E87- with the Part
No. 8L0 820 043 up to and including Part No. index letter "C." For m.y. 1998 the harness connector to A/C control head -E87- has
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87-122

Notes:

If both display fields of A/C control head -E87-
(Part No. 8L0 820 043 beginning with Part No.
index letter "D") are not illuminated when the
ignition is switched on, check the voltage supply
from terminal 58d (dimmer) to A/C control head
-E87- page 01
-115
(Electrical test).

If the buttons for A/C control head -E87- (Part
No. 8L0 820 043 beginning at Part No. index
letter "D") do not light up when the light is
switched on, check the voltage supply from
terminal 58s (illumination) to A/C control head -
E87- page 01
-115
(Electrical test).

If an A/C control head -E87- with the Part No.
8L0 820 043 beginning with Part No. index
letter "D"is installed in a 1997 m.y. vehicle, the
brightness in the switch cannot be changed
page 01
-115
(Electrical test).

If an A/C control head -E87- with Part No. 8L0
820 043 including Part No. index letter "C" is
installed in a 1998 m.y. vehicle, the brightness
in the switch cannot be changed page 01
-
115
(Electrical test).
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87-137

Notes for installing:

When installing flap motor, ensure that relay
lever -D- is correctly positioned ( illus. A87
-
0161 on page 87
-136
).

Install strap -A- (on bracket for motor) first into mounting -B- (on
heater/air conditioning assembly). After installing, always check DTC memory page 01
-18
.
Testing -V85- page 01
-42
(output DTM).
Electrical test page 01
-115
.
Wiring harness must be installed so that it does not come in contact
with moving components (e.g. motor linkage). If the crank on the motor is positioned so that the lever can not be
hooked in or the motor can not be installed, connect motor to the
wiring harness, switch on ignition and place lever in appropriate
position by activating the button for air distribution on A/C control head
-E87-.
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yp
e=re
pair&id=AUDI.B5.HA01.87.21