Troubleshooting Hints
Perform before beginning System DiagnosisRadio 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 CTSY Fuse. If open, check for a short to ground through CKT 40.
3. Check RADIO Fuse. If open, check for a short to ground through CKT 43.
4. Make sure ground G2O3 is clean and tight.
Radio Noise:
A noise "sniffer" may be used to aid in troubleshooting Radio noise. Description and Operation
1. Test the Radio outside with the hood down.
2. Ignition noise on FM indicates a possible defective Electronic Ignition (EI) System. Refer to 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 Diagnostic Aids. Diagnostic Aids
- Refer to System Diagnosis. Initial System Diagnosis