Auto-Check System, Troubleshooting

General notes

- For locations of Auto-Check system components in engine compartment See wiring diagrams.

If all specified values are obtained during troubleshooting and Auto-Check system continues to malfunction:

- Replace Auto-Check system/trip computer printed circuit board.

If incorrectly formed symbols or lines appear on display:

- Replace Auto-Check system/trip computer display module. Before replacing a faulty component:
- Check wiring to component for open/short circuits according to wiring diagram, repair as necessary.

If Auto-Check system display is dim:

- Check bulbs.

Test conditions
- Battery OK
- Fuse S8 OK
- Fuse S15 OK
- Auto-Check system coding switch set properly.
- Voltage stabilizer OK.
- Use digital multimeter (Fluke 83 or equivalent), connector test kit VW 1594, VAG 1598 test box, VAG 1598/4 adapter cable and VAG 1598/20 test adapter when performing electrical checks
- Always refer to appropriate wiring diagram when troubleshooting

NOTE: If available, use VAG 1598/13 adapter cable in place of VAG 1598/20 test adapter




Test measurement at red 26-point instrument cluster connector




Test measurement at green 26-point instrument cluster connector




Test measurement at black 14-point instrument cluster connector