start stop button AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual

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Checking

- Start engine and let idle.

- Switch A/C on, push "AUTO" button, set
temperature to "LO" and blower speed to "HI".

A/C compressor symbol must light up and
A/C must run.

- Using VAG 1551 scan tool, select "Basic
Setting" function 04, display group 004 page 01
-150
.

A/C compressor must stop (visual check)
If the A/C compressor does not shut off:

- Switch A/C off (press "minus" button for fresh air
blower in A/C control head repeatedly, until all
indicators are off).

Continue to let engine run in idle.

- Using VAG 1551 scan tool, select "Read
Measuring Value Block" function 08, display
group 004.
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