Golf GLS L4-2.0L (AVH) (2002)
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Use adapter cables from VAG1594 to connect multimeter to terminals 1 +2 (ECM connector) for voltage measurement.
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Measure voltage supply and observe display group 41, display field 4.
Htng.beh.cat.ON indicated:
Specification: 11.0 to 14.5
VHtng.beh.cat.ON
Htng.beh.cat.OFF (alternating) indicated:
Specification: oscillating between 0.0 and 12.0 V
If specified value is not obtained:
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Switch ignition off.
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Remove wiper arms and wind cowl
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Connect VAG1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.