90CS Quattro V6-2.8L (AAH) (1994)
Control Assembly: Technical Service Bulletins
A/C Control Head on-Board Diagnostic (OBD) Display, Checking
A/C Control Head On-Board Diagnostic (OBD) Display, Checking
In addition to A/C system On-Board Diagnostic (OBD) using the VAG 1551 Scan Tool (ST), the A/C control head contains a 61-channel OBD display
which can be accessed without the use of special tools.
Starting display
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switch ignition ON or start engine
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press and hold down RECIRCULATION button 1
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press and hold down upper AIR DISTRIBUTION button 2
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release both buttons
^
"01c" will be displayed ("01c" indicates channel 1, "02c" indicates channel 2, etc.)
To select a different channel,
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press temperature + button to go to next higher channel
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press temperature - button to go to next lower channel
To call up information about a particular channel,
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select desired channel
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press RECIRCULATION button 1
To leave memory display,
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press AUTO button, or
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switch ignition OFF