1997 AUDI A4 Climate Control Components In Passenger Compartment Workshop Manual

87-120


Climate control components
in passenger compartment,
servicing
Component electrical testing page 01
-115
.

A/C control head -E87-, removing and
installing


Notes:

Always check DTC memory before removing
E87.
After replacing E87, always:

- Check coding or enter new coding.

- Perform basic setting.

- Check DTC memory.
Vehicles equipped with Nippondenso
compressors must have A/C control head E87
with Part No. index "H" and higher installed to
allow for correct coding. Coding E87 page 01
-8 .

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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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changed (connections for illumination, terminal 58, terminal 58s).
8L0 820 043D A4-
A/C full
y automatic DXX
Coding XXXXX
WSC ZZZZZ

For vehicles beginning m.y. 1998 there is only one A/C control head -
E87- (Part No. 8L0 820 043 beginning with Part No. index letter "D")
that can be used.
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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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87-123

Removing and installing (A/C control head
with double display)

- Check DTC memory.

CAUTION!

Obtain security code for anti-theft radio.
Note customer's pre-set radio stations.
Disconnect battery Ground (GND) strap.
Remove Radio
Repair Manual, Radio, Telephone, Navigation,
Repair Group 91


Remove center instrument panel trim Repair Manual, Body Interior, Repair Group 70
- Remove screws -A-.
- Remove screws -B-.
- Remove A/C control head.
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87-124


Notes: - Push back connector locks and unplug electrical connectors.
- Install in reverse order of removal.

After installing E87, check that shaped hose -C- of temperature sensor
G56 (blower V42) is routed correctly (not kinked). When installing screws -B-, position the center trim mounts correctly.After installing E87, always confirm correct coding, perform basic
setting and check DTC memory.
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87-125

Removing and installing (A/C control head
with single display)

Removing

CAUTION!

Obtain security code for anti-theft radio.
Note customer's pre-set radio stations.
Disconnect battery Ground (GND) strap.
Remove radio or radion with navigation system
Repair Manual, Radio, Telephone, Navigation,
Repair Group 91


- Grip control head through radio opening and
slide rearward.

Notes:

Parts catalog The control head is held in the center console with 4 clips -A-.Before replacing the control head, ensure correct application (e.g. with
or without knockouts for switches for seat heaters)
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