Troubleshooting Hints - General Information

RADIO INOPERATIVE
1. For checking a speaker. use a C or D cell battery and momentarily connect and disconnect it across the circuits to that speaker while listening for a slight popping sound or watching for the cone of the speaker to move in and out. If either happens, the speaker and circuitry are usually OK.
2. Check RADIO-HVAC Fuse. If open, check for a short to ground in circuit 640.
3. Check RADIO Fuse. If open, check for a short to ground in circuit 43.
4. Make sure ground G203 is clean and tight.

RADIO NOISE:
^ A Noise Sniffer may be used to aid in troubleshooting Radio noise. Use and Construction of A Noise Sniffer
1. Check Radio reception in an area away from tall buildings, metal structures, power lines, fluorescent lighting and power tools.
2. Ignition noise on FM indicates a possible defective Electronic Ignition (EI) System. Refer to Engine Controls. Ignition System
3. Check antenna coax connectors for corrosion or bad connections.
4. If a test antenna is used, ground the base of the test antenna to the vehicle body.
5. Coated screws or bolts can act as a poor ground.

GENERAL
^ Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove GOOD in a continuity/voltage check with a system disconnected. These circuits may be intermittent or resistive when loaded, and if possible, should be checked by monitoring for a voltage drop with the system operational (under load).
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems. Refer to General Troubleshooting Procedures. Diagnostic Aids
^ Refer to System Diagnosis.