A4 Quattro Sedan V6-3.2L (BKH) (2005)
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Replace the Brake Light Switch F / Brake Pedal Switch F47.
Checking voltage supply
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Switch the ignition on.
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Using a Multimeter, check the Brake Pedal Switch F47 electrical harness connector terminal 1 to Ground (GND).
Specified value: battery voltage.
If the specified value was not obtained:
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Using a Multimeter, check the Brake Pedal Switch F47 electrical harness connector terminal 3 to Ground (GND).
Specified value: battery voltage.
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Switch the ignition off.
If the specified value was not obtained:
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Check the wiring.
If the specified value was obtained:
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Replace the Brake Light Switch F / Brake Pedal Switch F47.
Checking wiring
If the manufacturers test box is being used. Perform the following step.
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Install the test box.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Engine Control Module (ECM) J623.
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Using a Multimeter, check the Brake Light Switch F / Brake Pedal Switch F47 electrical harness connector to the Engine Control Module (ECM)
J623 electrical harness connector T94 for open an circuit.
Brake Light Switch F / Brake
Engine Control Module
Pedal Switch F47 electrical
(ECM) J623 electrical
harness connector terminals
connector T94 terminals or test box sockets
2
43
4
16
Specified value: 1.5 Ohms Max.
If the specified value was not obtained:
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Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).