Jetta L4-1.8L Turbo (AWD) (2000)
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Set multimeter to measure voltage and connect to contacts 1 and 2 on connector to control module.
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Start engine and run at idling speed.
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Measure voltage supply:
When display group 41, display zone 2 displays: Display, Htg.bC.ON:
Specification: 11.0 - 14.5 V
Display, Htg.bC.ON/Htg.bC.OFF (alternating)
Specification: Between 0.0 - 12.0 V fluctuating
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Switch off ignition.
If no voltage is present:
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Connect test box VAG 1598/31 to control module wiring harness. The engine control module remains disconnected.