Allroad Quattro V6-2.7L Turbo (APB) (2002)
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Specification: Infinity Ohms (no continuity)
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Depress brake pedal.
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Specification: approx.: 0 Ohms
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Connect hand-held multimeter for resistance measurement between terminals 3 and 4.
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Specification: approx.: 0 Ohms
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Depress brake pedal.
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Specification: 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
Measure against
terminal
1
Ground (GND)
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The LED must come on
Harness connector
Measure 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/Scan Tool Connecting and Initial Checks/Connecting 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 box,
terminal
socket
2
56
4
55
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Repair any open/short circuit as necessary.