Inspection and Verification

Internal diagnostic examination of the radio should be left to the authorized radio service center. However, the automotive technician should be able to analyze and isolate radio reception conditions to the proper area or component causing the condition. All radio conditions can be isolated to one of the following five general areas:

• Antenna system.
• Radio chassis (18806).
• Radio speaker (18808) system.
• Radio noise suppression equipment.
• Premium sound system.

The diagnosis charts and tests should be used with the Electrical and Vacuum Troubleshooting Manual and an appropriate radio tester to accurately diagnose and quickly service most radio system concerns.

1. Verify the vehicle owner's original concern by operating the electronic audio system to duplicate the condition.

2. Inspect to determine if one of the following mechanical or electrical concerns apply:

   
   
   

   VISUAL INSPECTION CHART

   Mechanical

   Electrical

   Radio chassis with or without tape player physically damaged, misaligned, any controls inoperative Antenna and two-piece radio antenna lead in cable physically damaged, misaligned connections Radio speakers mounting/speaker cones physically damaged, misaligned Radio ignition interference capacitor, radio frequency interference suppression bond and radio receiver hood bonding strap misaligned, cleanliness and metal-to-metal contact

   Open fuses Open connectors Corroded connectors Ignition switch

   
   

3. If the concern(s) remains after the inspection, determine the symptom(s) and proceed to the following Symptom Chart. Refer to the electrical schematics, and to the Symptom Chart to isolate radio chassis concerns.