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No Sound From One Speaker

NOTE: For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER - INTRODUCTION article. Perform VERIFICATION TEST VER-1A  after each repair.
  1. Using scan tool, read DTCs. If scan tool displays a specific shorted channel, go to that channel test. If scan tool does not display a specific shorted channel, go to next step.
  2. If inoperative speaker is a pillar speaker, go to next step. If inoperative speaker is not a pillar speaker, go to step  5 .
  3. Ensure radio is off. Disconnect inoperative pillar and lower speaker from same side. Using an external ohmmeter, measure resistance between inoperative pillar (-) terminal and lower speaker (-) terminal. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open speaker (-) circuit.
  4. Measure resistance between inoperative pillar (+) terminal and lower speaker (+) terminal. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open speaker (+) circuit.
  5. Turn radio on. Disconnect inoperative speaker connector terminals. Using an external voltmeter, measure voltage between ground and inoperative speaker (+) terminal. If voltage is about 6 volts, go to next step. If voltage is not about 6 volts, go to step  8 .
  6. Measure voltage between ground and inoperative speaker (-) terminal. If voltage is about 6 volts, replace speaker. If voltage is not about 6 volts, go to next step.
  7. Gain access to amplifier 14-pin connector C1. Do not disconnect connector. Measure voltage between ground and backprobe amplifier 14-pin connector C1 inoperative speaker ground circuit. See IDENTIFYING AMPLIFIER SPEAKER CIRCUITS  table. If voltage is about 6 volts, repair open speaker (-) circuit. If voltage is not about 6 volts, replace amplifier.
    IDENTIFYING AMPLIFIER SPEAKER CIRCUITS

    Circuit Terminal No. Wire Color
    Left Front (-) 1 Brown/Red
    Left Rear (-) 8 Brown/Light Blue
    Right Front (-) 2 Light Blue/Red
    Right Rear (-) 3 Dark Blue/Orange
    Left Front (+) 5 Dark Green
    Left Rear (+) 7 Brown/Yellow
    Right Front (+) 6 Violet
    Right Rear (+) 9 Dark Blue/White
  8. Ensure radio is on. Gain access to amplifier 14-pin connector C1. Do not disconnect connector. Measure voltage between ground and backprobe amplifier 14-pin connector C1 inoperative speaker (+) circuit. See IDENTIFYING AMPLIFIER SPEAKER CIRCUITS  table. If voltage is about 6 volts, repair open speaker (+) circuit. If voltage is not about 6 volts, replace amplifier.
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