Description of on-Board Diagnostics
Instrument cluster On Board Diagnostic (OBD) from VIN 8N_040001 and/or software versions D26 & D03
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.
Information in this section also applies to replacement instrument clusters with software version D26 installed in vehicles through VIN 8N_040000.
Vehicles from start of production through VIN 8N_040000 contain instrument clusters with software versions through D24 have limited Diagnostic Trouble Code (DTC), Read Measuring Value Block and Adaptation information not specifically covered.
Information on clusters on vehicles up to VIN 8N_040000 with software versions through D24 are contained in section "Instrument cluster On Board Diagnostic (OBD) through VIN 8N_040000 and software versions D24.
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), VAG 1552.Mobile Scan Tool (ST) or VAS VAS 5052 Vehicle Diagnostic Testing and Information System.
Instrument clusters installed from VIN 8N_040001 have expanded Diagnostic Trouble Code (DTC), Read Measuring Value Block and Adaptation information over previous models.
For example: Service Interval Display (SID) adaptation values for USA/CDN models with fixed service intervals:
Fixed service interval values, SID adaptation values
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.
- 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.