Brake Switch and Brake Position Switch, Checking

Brake Light Switch And Brake Pedal Switch Signals, Checking

For vehicles with cruise control system only!

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
- VAG 1551/1552 Scan Tool using VAG 1551/3 Adaptor cable
- VAG 1598/22 Test Box
- Fluke 83 multimeter
- VW 1594 Adaptor kit
- Wiring diagram

- Connect VAG 1551/1552 Scan Tool. Refer to "Scan Tool Testing/VAG 1551 Scan Tool/Test Requirements and Work Procedures" Testing and Inspection
- Start engine and let idle
- Press 0 and 1 buttons to select "Engine Electronics" address word 01.

Indicated on display (example only)


06A906018AB Motronic M5.9.2 HS V06 ->
Coding 00000 WSC 00000


- Press -> button.

Indicated on display


Rapid data transfer HELP
Select function XX


- Press 0 and 8 buttons to select "Read Measuring Value Block" function 08.
- Press Q button to enter input.

Indicated on display


Read measuring value block HELP
Input Display group number XXX


- Press 0, 6 and 6 buttons to select "Display group 66"
- Press Q button to enter input.

Indicated on display


Read measuring value block 66 ->
1 2 3 4


- Observe value in Display field 2 (3rd and 4th digits from left)
- Specification: x x 0 0
- Fully depress brake pedal, observe values in Display field 2
- Specification: x x 1 1
- Press -> button.

Indicated on display


Rapid data transfer HELP
Select function XX


- Press 0 and 6 buttons to select "End output" function 06.
- Press Q button to enter input.
- Switch OFF ignition.







If specification not obtained
- Connect VAG 1598/22 Test Box to ECM harness connector.
- Check wiring for open circuit between Test Box and 4-pin harness connector using Wiring diagram.
- Terminal 3 + socket 48
- Terminal 4 + socket 47
Wire resistance: 1.5 Ohms maximum

If specification obtained
- Check wiring for open circuit between 4-pin harness connector terminals 1 + 2 and fuel pump relay using Wiring diagram.