A4 V6-3.0L (AVK) (2004)
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Press <- button.
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Under -1- select diagnostic function "06 - End output".
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Switch ignition off and then on again.
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Leave ignition switched on for 10 seconds. Then check DTC memory of control module that has just been connected, using scan tool.
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If DTC "Data bus drive faulty" is now indicated, replace control module which has just been connected.
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If DTC "Signal wire defective" is not read out, connect next control module and repeat procedure.
