Troubleshooting Hints

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 for a short to ground through CKT 1733.
3. Check RADIO Fuse. If open, check for a short to ground through CKT 43.
4. Make sure ground G302 is clean and tight.

RADIO NOISE:
A noise "sniffer may be used to aid in troubleshooting Radio noise.
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 Ignition System. Ignition System
3. Check antenna coax connectors for corrosion or bad connections.
4. If a test antenna is used, ground the base of the antenna to the vehicle body.
5. Coated screws or bolts can act as poor grounds.

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. Initial System Diagnosis