A4 Cabriolet L4-1.8L Turbo (AMB) (2005)
Brake Light Switch: Testing and Inspection
With Manufacturer's Scan Tool
Brake Light Switch -F- And Brake Pedal Switch -F47-
Special tools and workshop equipment required
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V.A.G 1526 A Multimeter
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V.A.G 1527 B LED voltage tester
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V.A.G 1594 A Connector test kit
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V.A.G 1598/31 Test box
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VAS 5051 Vehicle diagnostic, testing and information system
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VAS 5051/1 Adapter
NOTE: Command from Sender -2- for accelerator pedal position -G185- (potentiometer) to Engine Control Module (ECM) for opening throttle
valve is suppressed for safety reasons when brake is pressed. To do so the brake light signal and also the Brake Pedal Switch -F47- signal are
required in the ECM. If the brakes are operated when the accelerator pedal is held at a constant position the engine is immediately reduced to
idling speed. Incorrectly adjusted switches may lead to unwanted regulating actions.
Work sequence
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Connect VAS 5051 scan tool and select vehicle system "01 -Engine electronics" in selection.
When doing this the ignition must be switched on.