RS 6 V8-4.2L Turbo (BCY) (2003)
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Brake Light Switch: Testing and Inspection
Brake Light Switch -F- And Brake Pedal Switch -F47-, Checking
NOTE:
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With the brake pedal pressed, command from the accelerator pedal sender (potentiometer) to the engine control module for opening the throttle
valve is suppressed for safety reasons. The control module requires the brake light switch and brake pedal switch signals for this purpose.
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If the brake is actuated with the accelerator pedal constantly pressed, the engine speed is immediately regulated to idling speed. A faulty switch
can lead to unintentional speed regulation.
Work sequence
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Connect vehicle diagnostic, testing and information system VAS 5051 and select vehicle system "01 - Engine electronics" from list. Ignition must
be on. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool
Connecting and Initial Checks/Connecting VAS 5051 Scan Tool
Indicated on VAS 5051:
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From list -1- select diagnostic function "08 - Reading measured value block".
Indicated on VAS 5051:
1
Enter display group
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Use keypad -2- to enter "066" for "Display group number 066" and confirm by touching Q key.
Indicated on VAS 5051: