Inspection Procedure 13: Constant noise.: Diagnosis

Use the Symptom Chart to diagnose the possible cause(s) of the noise. Noise is often created by the following factors:

• Traveling conditions of the vehicle
• Terrain of area traveled through
• Surrounding buildings
• Signal conditions
• Time period

If there are still problems with noise, even after performing inspection procedures 5 to 12, obtain information on the factors listed above. Determine whether the problem occurs on AM or FM, the station names, frequencies, etc. and contact the radio manufacturer's service center.