Passat Sedan L4-1781cc 1.8L Turbo (AEB) (1999)
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Observe Display in Display zone 4.
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It must show: "Compr. OFF"
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Switch ON A/C system.
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Select lowest temperature and highest blower speed.
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Display in zone 4 must change to: Compr. ON.
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Floor accelerator pedal quickly and release again (short burst of throttle).
When quickly pressing the accelerator pedal down the Display in Display zone 4 must change from "ON" to "OFF" for a few seconds (compressor
cut-off under vehicle acceleration).
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Press -> button.
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Press 0 and 6 buttons to select Function 06: "End data transfer"
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Press Q button to enter input
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Switch OFF ignition.
NOTE: A/C compressor is switched OFF by the Engine Control Module when accelerating from standstill and from low speeds. At Wide Open Throttle
the A/C compressor is switched OFF by the Transmission Control Module (TCM) kick-down switch.
Continuation
If display does not appear as described:
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Connect VAG 1598/22 Test Box to Engine Control Module harness connector.
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Check wiring for open circuit between Test Box sockets 8 and A/C using Wiring diagram.
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Wire resistance: Max. 1.5 Ohms
If wiring OK
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Check function of A/C Control Module.
NOTE: If DTC memory has been erased or the Engine Control Module was disconnected from its Voltage supply, the Readiness Code must be created