USB Connection

Special tools and workshop equipment required 

• Diagnostic Operation System VAS 5051 or Vehicle Diagnosis and Service System VAS 5052
• Diagnostic adapter cable VAS 5051/5a or VAS 5051/6a or VAS 5052/3
• Select "Test Instruments" in Diagnostic Operation System VAS 5051 or Vehicle Diagnosis and Service System VAS 5052.

Troubleshooting Procedure

The USB connection is not capable of on board diagnostics (OBD).

If signal transmission to radio/radio-navigation system is not functioning, then the voltage supply at harness connector can be checked.

Test Prerequisites

• Beforehand, make sure that USB stick or mp3 player is not the malfunction source. Refer to the Owner's Manual.
• Check that the fuse is OK.
• Check radio/radio-navigation system is free of malfunctions via on board diagnostic (OBD).

Procedure 

-- Remove storage compartment with USB connection installed. Refer to STORAGE COMPARTMENT WITH USB CONNECTOR .

-- Disconnect electrical connection on bottom of storage compartment.

-- Using Vehicle Diagnosis, Testing and Information System VAS 5051 or Vehicle Diagnosis and Service System VAS 5052, measure the following voltages at harness connector on wiring harness side.

• at 12-pin harness connector T12, at voltage supply terminal 6, positive, with radio unit switched on.
• at 12-pin harness connector T12, at voltage supply terminal 8, positive, control wire, with radio unit switched on.
• at 12-pin harness connector T12, at terminal 3 voltage supply terminal 31, negative

If the voltage values specified cannot be measured, then repair wire connections according to wiring diagram.

If no faults can be detected, replace storage compartment with USB connection.