Diagnosis: Overview

The customer should be interviewed to get a thorough description of the symptoms and the conditions under which they occur (location, station, etc.).

NOTE:
^ The information in this Service Bulletin applies to the Legend and NSX models. Where operations are similar, only the Legend model is illustrated. The NSX is illustrated when the operations are significantly different from those of the Legend.

^ The connector number references are the same as those found in the appropriate Electrical Troubleshooting Manual (ETM).

Both the Legend and NSX have dual antenna systems. The radio uses both antennas (power mast antenna and rear window antenna) to choose the best signal for FM stations, but it uses only the power mast antenna for AM stations. So check the radio reception on AM stations first, even if that was not the customer's complaint.

^ If you find poor reception on AM stations, then go to Diagnosis 1, Poor Reception.

^ If you find electrical noise or interference on AM stations, then go to Diagnosis 2, Electrical Noise or Interference.

^ If you find that the problem is only on FM stations, go to Diagnosis 3 Window Antenna Test.