A4 V6-3.0L (AVK) (2004)
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Connect multimeter between terminals 1 and 4 to measure resistance.
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Specified value: infinity Ohms (no continuity).
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Press brake pedal.
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Specified value: approx. 0 Ohms
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Connect multimeter between terminals 2 and 3 to measure resistance.
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Specified value: approx. 0 Ohms
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Press brake pedal.
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Specified value: infinity Ohms (no continuity).
If the specified values are not obtained:
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Replace brake light/brake pedal switch.
If specifications are obtained:
Checking power supply
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Connect voltage tester VAG1527 B as follows:
Connector
Measure to
terminal
1
Car body Ground point
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The LED should illuminate.
Connector
Measure to
terminal
3
Car body Ground point
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Switch ignition on.
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LED should illuminate.
If the LED does not illuminate:
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Check wiring for open circuit and service if necessary.
If the LED illuminates: