Symptom: a Passat B5GSi sedan open the receiver, the left front speaker does not ring.
     Troubleshooting: The car is used in the Gamma cable system. With the fault diagnosis instrument V.A.G1552 implementation of 56 groups, select the 08 function to read the data block into the 002 display group, showing the left front speaker connection interrupt. Check the plug is not inserted in place, because the left front door to do sheet metal, the maintenance staff due to neglect, re-plug the plug, everything is normal.