S4 Quattro Sedan V6-2.7L Turbo (APB) (2000)
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Specified value: approx.: 0 Ohm
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Connect hand-held multimeter for resistance measurement between terminals 3 and 4.
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Specified value: approx.: 0 Ohm
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Depress brake pedal.
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Specified value: infinity Ohms (no continuity)
If specifications are not obtained:
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Check adjustment or replace brake light/brake pedal switch.
If specifications are not met:
Check voltage supply
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Connect VAG1527 B between following sockets on harness connector:
Harness connector
Measures against
Terminal
1
Ground (GND)
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The LED must come on
Harness connector
Measures against
Terminal
3
Ground (GND)
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Switch ignition on.
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The LED must come on
If LED does not come on:
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Check wiring connection from terminal 1 or 3 of connector for open circuit (fuse) or short circuit to Ground (GND).
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If necessary eliminate open circuit or short circuit to Ground (GND)
If LED comes on:
Check activation
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Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to the engine control module itself. Refer to "Scan
Tool Testing/Wiring And Component Check With VAG1598/31 Test Box" under "Powertrain Management/Computers and Control
Systems/Testing and Inspection", See: Powertrain Management/Computers and Control Systems/Testing and Inspection
Test the following wiring connections for open circuits and short to B+ or Ground (GND):
Harness connector
VAG1598/31 test
Terminal
box, socket
2
56
4
55
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Repair any open/short circuit as necessary.