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AUDIO - Radio

T-120prose procedure

Radio

Symptom: Poor sound quality or noise

Step 1

  1. 1
    Tune to the strongest AM station using the automatic memory function. (Refer to pages T-111.)
    Illustration of a person inside a car listening to the radio with hands to their ears, indicating sound quality evaluation.
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  2. 2
    If the automatic memory function does not operate, go to Step 4.
  3. 3
    Compare sound quality with that of another vehicle that has the same type audio unit.
  4. 4
    If the sound quality is inferior to the other unit, go to Step 2.
  5. 5
    If the sound quality is the same as the other unit, the system is OK.

Step 2

  1. 1
    Play a known good cassette tape, and compare the sound quality with another vehicle that has the same type audio unit.
    Two cassette tapes shown side-by-side with curved arrows between them, indicating swapping/comparing cassette tapes.
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  2. 2
    If the sound quality is inferior to the other unit, the malfunction may be in the speaker circuit. Go to Step 3.
  3. 3
    If the sound quality is same as the other unit, the malfunction may be in the antenna circuit. Go to Step 4.

Step 3

  1. 1
    Check for damage to the speakers.
    Speaker with disconnected speaker connector being tested with an ohmmeter (multimeter shown at left).
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  2. 2
    Check for proper connection of speaker connectors.
  3. 3
    Disconnect the speaker connectors, and measure resistance of each speaker.
  4. 4
    If a speaker has incorrect resistance or is damaged, replace it.
  5. 5
    If the speakers are OK, replace the audio unit.
Resistance
4Ω

Step 4

  1. 1
    Check that there is no continuity (infinite ohms) between the mast antenna and a body ground.
    Mast antenna labeled 'MAST ANTENNA' being tested with an ohmmeter for continuity to ground.
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  2. 2
    If there is continuity, replace the antenna.
  3. 3
    If there is no continuity, go to Step 5.
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See also

T-111AUDIO — Radio / Cassette Tape Player Operating Procedure

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