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‒ Switch off air conditioner.
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‒ Specification for display zone 4: "Compr.OFF"
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‒ Switch on air conditioner by pressing "AUTO" key and select maximum warm or cold air setting. The compressor should run.
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‒ Specification for display zone 4: "Compr. ON"
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‒ Floor and release the accelerator quickly (short blip).
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‒ Specification for display zone 4: The display should change from "Compr.ON" to "Compr.OFF" for a few seconds (air conditioner compressor shut-off during acceleration).
If the readout in display zone 4 is not as described:
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‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect to the engine control unit itself.
=> Page 24-20.
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‒ Test for open circuit and short to positive or earth in the following wiring connection:
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Test box V.A.G 1598/31 Socket
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AC operating and display unit -E87 Contact
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41
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=> Current flow diagrams, => Electrical fault-finding => and Fitting locations binder
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‒ Rectify short circuit or open circuit if necessary.
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‒ If there are no faults in the wiring, test operation of air conditioner.
=> Heating, air conditioner; Repair Group 01; Self-diagnosis for air conditioner
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