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◆ If the two display zones in the operating and control unit -E87 are not illuminated when the ignition is switched
on, rectify voltage supply from terminals 58, 58d and 58s (dimming) to -E87 according to the current flow
diagram =>Page 46 (Electrical check).
4 - Fault table
4.1 - Fault table
Notes:
◆ Listed below in ascending order of fault codes are all the faults detected by air conditioner operating and
display unit -E87 and displayed on V.A.G 1551.
◆ Faults are displayed as being sporadic if they only occur from time to time or if the fault memory has not
been erased following fault remedy. (The content of the fault memory is retained until it is erased, "non-
volatile memory".)
◆ In "Rapid data transfer" mode the fault code and flash code (for individual components only) only appear on
the printout.
Example:
Fault code Flash code
5-digit 4-digit
00532 2232
◆ An indication of the type of fault may also appear in the fault table (a display marked * appears, as well as
the component concerned or the "info" display).
◆ Once repairs have been completed, the fault memory is always to be interrogated again with fault reader
V.A.G 1551 and erased.
◆ Before replacing components, always check the relevant positive and earth connections (terminals 15, 75,
30 and 31), as well as all connectors (between -E87 and the component detected as being defective),
according to the current flow diagram.
◆ With all sporadic faults, it is particularly important to check the connectors for possible loose contacts.
◆ After replacing a component of the air conditioner/heating system, the basic setting (function 04) must always
be performed and then the fault memory read out and any faults indicated rectified and erased from the
memory (functions 02 and 05).
◆ Use test box V.A.G 1598/11 and V.A.G 1598/12 for checking the electrical connections of operating and
display unit -E87 in line with the current flow diagram.
◆ If the operating and display unit -E87 remains in operation after switching off the ignition, check wiring to -
E87, (plug -D- contact -1- in model with two displays or plug -D- contact 10 in model with one display) for
"short to positive" according to current flow diagram.
◆ If a fault is detected on the potentiometer in one of the air distribution positioning motors, the air distribution
can be influenced by actuating the keys on operating and display unit -E87.
◆ The display is switched from °C (Celsius) to °F (Fahrenheit) and vice versa by actuating the "Temperature
+" key when the "Air recirculation key" is pressed.
◆ If problems have been reported with the AC/heating electronics but no faults can be detected, perform
functions
"Final control diagnosis 03" and "Reading measured value block 08".
◆ Check refrigeration capacity of air conditioner =>Page 186 .
V.A.G 1551 printer Possible causes of fault Fault remedy
00000
No faults detected
If "No faults detected" appears after performing repairs, the self-diagnosis is completed.
00532 2234
Power supply
* Signal too low /SP
- Voltage dips in electrical system to values
below 9.5 V 1)
Contact resistance in the wiring to -E87 (ter‐
minal 15 or 31).
- Check alternator and voltage regulator.
=> Electrical System; Repair group 01
Use current flow diagram to locate and elim‐
inate contact resistance.
1) If the vehicle's voltage drops to a value below 9.5 V, the compressor is switched off for at least 25 s. It is
switched back on only when the voltage exceeds a value of 10.8 V.
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
3.1 - Interrogating fault memory 9
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