Radio, Stereo, and Compact Disc: Testing and Inspection

AUDIO DIAGNOSTIC TEST PROCEDURES
CAUTION: The CD player will only operate between approximate temperatures of -23 °C and +65 °C -10 °F and +145 °F.

Whenever a radio malfunction occurs:
1. First check FUSES in the Fuse Block:
a. Fuse 5, Memory feed and the Power Antenna if equipped.
b. Fuse 7, Illumination
c. Fuse 8, Power Amplifier
d. Fuse 14, Ignition feed

NOTE: The vehicles are shipped with the INTERIOR LAMP fuse disconnected.

2. Verify, the radio wire harness are properly connected before starting normal diagnosis and repair procedures.

DIAGNOSTIC CONDITIONS
Noise Distortion In All Speakers
Does the distortion occur through all operations:
- 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 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, refer to Radio/Stereo/Testing and Inspection/Procedures/Radio Diagnosis.
- If OK, replace amplifier

Electrical Noise Distortion One Speaker
- Remove output signal connector from amplifier and check for short to ground on the speaker with the distortion.
- 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, replace speaker.
- Not shorted to ground, check speaker resistance at amplifier connector for two to five ohms.
- If resistance is OK, refer to Radio/Stereo/Testing and Inspection/Procedures/Radio Diagnosis. If radio checks OK, replace amplifier.
- If resistance is less than two ohms, replace speaker. If resistance is OK, repair wires

Mechanical Noise Distortion
- Check trim for loose parts, and speaker attachments for buzzes
- Remove speaker that is still connected and listen for distortion. If distortion remains, replace speaker.

One Speaker Non-Operative
- Remove output signal connector from amplifier and check for two to five ohms resistance to the non-operative speaker.
- If resistance is less than two ohms, test speaker for resistance.
- If OK, repair wire. If not OK, replace speaker.

All Speakers Non-operative
- Check radio for being ON, are the display lights on
- Radio not ON, refer to Radio/Stereo/Testing and Inspection/Procedures/Radio Diagnosis
- 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

No Bass Frequencies, High And Mid Frequencies OK
- 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