Description of on-Board Diagnostics

Instrument Cluster On Board Diagnostic (OBD) through VIN 8N_040000 and Software Version D24

Application notes
Always confirm vehicle VIN and instrument cluster software version as per section title above. Confirm instrument cluster software version by initiating OBD program and reading information in display.

In the event an instrument cluster was previously replaced in a vehicle with VIN up to 8N_040000, the new/replacement cluster may contain software version D26 which contains certain Diagnostic Trouble Code (DTC), Read Measuring Value Block and Adaptation information that is not specifically covered in this section.

Information on replacement instrument clusters with software version D26 are contained in section "Interment cluster On Board Diagnostic (OBD) from VIN 8N_040001 and/or software versions D26 & D03".

General information
The instrument cluster contains an electronic speedometer, tachometer, liquid crystal (LCD) displays for odometer, trip odometer, digital clock with date, as well as analog coolant temperature and fuel level gauges. Control and warning lamps are situated within the speedometer and tachometer faces.

A "Driver's Information System" LCD is located between the tachometer and speedometer. Displayed information includes an auto check system, outside air temperature, radio frequency and selectable trip computer functions.

The auto check system integrated with the Driver's Information System monitors the brake system, coolant temperature, fuel level, engine oil pressure, and displays the ambient temperature as a default.

The optional Navigation system display is also included in the Driver's Information System (where applicable).

The instrument cluster is controlled by a microprocessor and has extensive On Board Diagnostic (OBD) capability. If malfunctions occur in any of the system components, corresponding DTCs are stored in the Diagnostic Trouble Code (DTC) memory of the instrument cluster. These can then be identified using VAG 1551 Scan Tool (ST), VAG1552.Mobile Scan Tool (ST) or VAS VAS 5052 Vehicle Diagnostic Testing and Information System.

NOTE: The descriptions and displays in this section refer only to VAG1551.

The following adaptation (adjustment) functions are also possible:

- Adapting fuel gauge sender resistance range
- Adapting fuel consumption display
- Coding of language versions for on-board computer and Auto Check system
- Resetting service interval display
- Setting distance/kilometer counter after replacing instrument cluster

Message "dEF" on trip recorder display
If the control module in the instrument cluster detects a malfunction in its permanent memory, the letters "dEF" will appear on the trip recorder display.

- If "dEF" appears on the display, replace the instrument cluster.

Notes on replacing instrument cluster
- The instrument cluster must not be disassembled.
- If necessary, the instrument cluster can be replaced with an exchange unit (where applicable).
- Complete the damage report form and return it together with the malfunctioning instrument cluster.
- Malfunctioning units must always be returned in their original packing.
- Various input values must be adapted to replacement speedometer.