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| Select „Measurement module“ option in the vehicle diagnostic, testing and information system -VAS 505X-. |
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| Diagnosis cable -VAS 5051/6a- |
| Procedure for fault finding. |
| If the signal transfer to the radio or radio/navigation system does not work, check the voltage supply in the connection. |
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| Beforehand, ensure that the USB memory stick or the MP3 player is not the cause of the fault, → Owner's Manual. |
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| Verify that the fuse is in good condition. |
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| Use the self-diagnosis to verify that the radio or radio/navigation system shows no faults. |
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| Measure the following voltages on the cable harness connection using the Vehicle Diagnosis, Testing and Information System -VAS 505X-, |
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| in the connector T12, with 12 contacts, on voltage supply terminal 1, terminal 31, negative |
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| in the connector T12, with 12 contacts, on voltage supply terminal 7, terminal 30, positive, with the radio connected. |
| If you can not measure the voltage values indicated, repair the connections to the wires, following the electric circuit diagram. |
| If no faults are detected, replace the USB / Ipod unit. |
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