Beetle L4-1.9L DSL Turbo (ALH) (1998)
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Press Q button to enter input.
Display will appear as shown
Read measuring value block
HELP
Input Display group number XXX
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Press 0, 0 and 2 buttons to select "Display group 2".
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Press Q button to enter input.
Display will appear as shown (1 to 4 = Display zones)
Read measuring value block 2
->
1
2
3
4
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Switch ON A/C by pressing "Auto" button and selecting lowest temperature.
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A/C compressor must run.
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Observe display in Display zone 3.
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Specified Value: 1 x 1 (A/C system signal)
Read measuring value block 2
->
1
2
111
4
If specification not obtained
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Connect VAG 1598/22 (or 1598/31) Test Box to ECM wiring harness.
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Check wiring for open circuit between following Test Box socket and A/C system using Wiring diagram.
Up to MY 1999
Socket 16
From MY 2000
Socket 29
Wire resistance: 1.5 Ohms maximum