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01 - Self-diagnosis
1 - Self-diagnosis
1.1 - Self-diagnosis
1.2 - Safety precautions
Pay attention to the following if testers and measuring instruments have to be used in the course of a test drive:
Attention:
◆ Always attach testers and measuring instruments to back seat and have them operated from there by a
second person.
◆ If testers and measuring instruments were to be operated from front passenger's seat, person sitting there
could suffer injury in the event of an accident due to triggering of front passenger's airbag.
Heed the following so as to avoid possible injury and/or the destruction of electrical and electronic components:
◆ Switch off ignition before disconnecting and connecting measuring instruments and testers.
◆ Certain tests may lead to a fault being detected by the control unit and stored. The fault memory is therefore
to be interrogated and if necessary erased on completion of all tests and repair work.
◆ Always switch off ignition before disconnecting and connecting battery so as not to damage electronic control
units.
Attention:
On vehicles fitted with telematics system, activate telematics control-unit service mode before disconnecting
battery.=>Radio, Telephone, Navigation; Repair Group 91
1.3 - Connecting up vehicle diagnostic, testing and information system VAS 5051 and
selecting functions
Test requirements:
• Vehicle supply voltage OK
Audi A3 1997 ➤
Electrical system Self-diagnosis - Edition 02.2002
1.1 - Self-diagnosis 1
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