Passat Syncro Wagon V6-2771cc 2.8L DOHC (AHA) (1998)
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Connect multimeter between harness connector terminals 1 and 2 (to ECM), using VW1594 connector test kit.
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Start engine and run at idle.
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Measure voltage supply and check display in display group 40, display field 2.
If display = Htg.bC.ON:
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Specified value: 11.0-14.5 volts
If display switches between "Htg.bC.ON" and "Htg.bC.OFF":
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Specified value: between 0.0-12.0 volts (oscillating)
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Switch ignition off.
If there is no voltage:
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Connect VAG1598/22 test box to ECM harness connector.
