Diagnostic Conditions

Noise Distortion In All Speakers
Does the distortion occur through all modes:
- AM and FM stations
- Cassette tape
- Compact disc

If not, check for radio interference, damaged tape or disc that may be causing the distortion. Refer to Sound Systems Operating Instructions in the Owners Manual for cleaning procedures of the cassette tape player.

- Check battery voltage, for 11 Volts or more.
- Check amplifier connectors, and wires for proper connection.
- If OK, check radio.
- If OK, replace amplifier

Electrical Noise Distortion One Speaker
- Remove wires from the amplifier to the distorted speaker and check for a short to ground.
- If shorted to ground, disconnect speaker connector and recheck from the amplifier for short to ground.
- If still shorted to ground, repair wires.
- Not shorted to ground, check speaker resistance at amplifier connector for three to eight ohms.
- If resistance is OK. If radio checks OK, replace amplifier.
- If resistance is less than three ohms, replace speaker. If resistance is OK, repair wires.

Mechanical Noise Distortion
- Check trim for loose parts, and speaker attachments for buzzes.
- Remove speaker while still connected and listen for distortion. If distortion remains, replace speaker.
- If no distortion, repair loose/rubbing parts in speaker mounting are(a)

One Speaker Non-operative
- Remove output signal connector from amplifier. Check the wire from amplifier connector to the speaker connector for resistance.
- If resistance is less than 1 ohm, wire is OK.
- If not OK, repair wire. If OK, replace speaker.

All Speakers Non-operative
- Check radio for ON state. Are the display lights on?
- Radio not ON, refer to Audio Diagnostic Test Procedures.
- Check fuses, amplifier connectors and wires for proper connection.
- Check for good ground.

No Bass Frequencies, High And Mid Frequencies OK
- Check radio for ON state. Are the display lights on?
- Radio not ON, refer to Audio Diagnostic Test Procedures.
- Check fuses, amplifier connectors and wires for proper connection.
- Check for good ground.
- Check amplifier for battery voltage, and ON/OFF voltage.
1. Battery voltage OK and NO voltage at the ON/OFF terminal, check for short or open in the ON/OFF circuit.
2. ON/OFF voltage OK, and NO battery voltage check for short or open in battery circuit.
3. Prior to replacing amplifier, check fuse to the cigar lighter and horn. If not OK, replace fuse. If fuse blows again, disconnect amplifier B+ wire connector.
4. If fuse still blows, the problem is not the amplifier. If fuse does not blow, replace the amplifier.
5. If shorted or open circuit, repair as necessary.