Checking and replacing the brake light switch Audi A4 B6

Tools:

Screwdriver flat medium
Nozzle for crank 8 mm
Collar for end nozzle

Parts and consumables:

Stoplight switch (VAG 1K2 945 511 RDW )

Notes:

The brake light switch is located in the pedal support. When the brake pedal is pressed by means of the switch, the brake light comes on. In addition, the brake light switch serves as a sensor for the ABS/EDS control unit. Therefore, the correct operation and adjustment of the brake light switch is of particular importance.

The brake light switch can only be installed once. Once removed, it must be replaced.

1 . Remove the side fuse panel (1) with a screwdriver.

Removing the side fuse panel Audi A4 II (B6)

Removing the Side Fuse Panel

Layout of cover fasteners in driver's footwell Audi A4 II (B6)

The layout of the cover fasteners in the driver's footwell

2. Unscrew the screws ( 2 ) and ( 3 ) of the cover.

Unscrewing the side bolt securing the pocket at the driver's feet Audi A4 II (B6)

3. Pull back the pocket ( 4 ) at the top of the instrument panel and remove it.

4 . Disconnect the diagnostic connector wiring harness and set the cover aside.

Wiring block for the diagnostic connector Audi A4 II (B6)

5. Remove the connector from the brake light switch.

Diagram of switches on the pedal bracket Audi A4 II (B6)

Schematic diagram of the switches on the pedal bracket

Brake light switch connector Audi A4 II (B6)

6. With a piece of wire, bridge the contacts in the connector. If after that, the brake lights come on, then the switch ( 2 ) is defective and must be replaced.

7 . Turn the brake light switch 45° to the left to release it. Remove the brake light switch.

8 . For performance of installation at the new switch of a stoplight completely take out a pusher (an arrow on an accompanying illustration).

Brake light switch diagram Audi A4 II (B6)

Brake light switch circuit

Warning:

During installation, do not press the brake pedal.

5 . Insert the switch with its locking strips ( 1 ) and ( 2 ) into the grooves of the pedal support and fix by turning to the right by 45°. The switch position must be secure. When installing the switch, the pusher itself takes the correct position.

6 . Fix the plug of the brake light switch, check the operation of the switch.

7 . Reinstall the pocket on the driver's side.

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