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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON and radio ON, Center the balance and fade adjustment on the radio and increase the volume.
    • If adjustment of the fade and balance eliminates the concern, review the operation of the radio with the customer.
  2. Ignition OFF, disconnect the amplifier C1 harness connector.
  3. Test for B+ on terminal H (U65) or E (US8/U66) .
    • If less than specified voltage repair short to ground or open high resistance.
  4. Disconnect amplifier harness connector C2 if equipped with Y07 or US8/U66.
  5. Ignition ON and radio ON, test for less than 1 volt on the amplifier mute signal circuit terminal A8 (US8/U66) or B1(U65).
    • If greater than 1 volt repair short to B+ or replace the radio.
  6. Test for greater than 9 volts on antenna enable signal circuit terminal A3 (US8/U66) or B11(U65).
    • If less than specified value, repair short to ground or open/high resistance or replace the radio.
  7. Ignition OFF, test for less than 1 ohm between the amplifier ground circuit terminal F (US8/U66) or A (U65) and ground.
    • If greater than specified value repair open/high resistance.
  8. Disconnect the amplifier C2 harness connector if equipped with Y67.
  9. Ignition ON and radio ON, center the balance and fade adjustment on the radio and increase the volume.
  10. Test for AC voltage between the left front low level audio signal (-) terminal A6 (US8/U66) or B9 (U65) and left front low level audio signal terminal (+) A7 (US8/U66) or B10 (U65) .
    • If AC voltage is not present replace the radio.
  11. If all circuits test normal replace the amplifier.
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