TT L4-1.8L Turbo (BEA) (2004)
Brake Light Switch: Testing and Inspection
With Manufacturer's Scan Tool
Brake Light Switch And Brake Pedal Switch, Checking
Special tools and equipment
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VAG1526A
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VAG1527B
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VAG1594A
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VAG1598/31
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VAS5051 with VAG5051/1
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 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.
Test sequence
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Connect VAS 5051 scan tool and select vehicle system "01 -Engine electronics" in selection. See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Manufacturer's Scan
Tool/Connecting VAS 5051/VAG 1551 Scan Tool (ST)
When doing this the ignition must be switched on.
Display on VAS 5051: