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Instrument cluster On Board Diagnostic (OBD)

General information
The instrument cluster is controlled by an internal microprocessor with On Board Diagnostic (OBD) capability. If malfunctions occur in monitored sensors and components, Diagnostic Trouble Codes (DTC) will be stored in memory together with an indication of malfunction type. A maximum of 4 DTCs can be stored simultaneously.

Sporadic malfunctions (indicated in the readout by "SP") are automatically canceled if not repeated in the next 50 engine start cycles.

For OBD purposes, the instrument cluster counts one start cycle whenever the ignition is switched on longer than 5 mm. and a minimum speed of 30 km/h (18.5 mp/h) is exceeded.

Before performing any troubleshooting or inspection, always begin by checking for DTCs using the OBD program. DTCs stored in memory are retrieved/checked with either the VAG 1551/1552 Scan Tool (ST) or VAS 5051 Vehicle Diagnostic Tester.


NOTE: The following description and illustrations deal specifically with the VAG 1551 scan tool. VAG 1552 and VAS 5051 procedures are similar.


Notes on exchanging instrument cluster
- Do not disassemble instrument cluster.
- When replacing an instrument cluster is necessary, follow normal exchange part procedures.
- Complete report form and return together with instrument cluster.
- Use original packaging from new cluster when returning items.
- Replacement instrument clusters must first be coded according to vehicle market version and equipment level variables using VAG 1551 Scan Tool (ST)
- Odometer reading must also be adapted to the replacement instrument cluster.