New Beetle GLS L4-2.0L (AZG) (2002)
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Connect multimeter using auxiliary cables from VAG 1594 to measure voltage at terminals 1 + 2 (connector to engine control module).
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Start engine and run at idle speed.
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Measure voltage supply and observe display group 41, display zone 4.
Display: Htg.aC.ON:
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Specification: 11.0-14.5 V
Display: Htg. aC.ON/Htg.aC.OFF (alternating):
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Specification: Between 0.0-12.0 V fluctuating
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Switch ignition off.
If no voltage is present:
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Remove inner plenum chamber cover, left:
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Connect test box V.A.G 1598/31 to control module wiring harness. Engine control module is not connected by this action.