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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures - DTC & Symptoms >> Diagnostic Information and Procedures >> DTC B1025, B1135, B1145, B1155: Audio Output (U65) >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    Some circuits supply audio signals to more than one speaker. It may be necessary to disconnect all speakers on the affected audio circuit when performing circuit tests.

  1. Ignition OFF, disconnect the harness connector at the appropriate P19 Speaker. Ignition ON, A11 Radio ON, mute OFF.
  2. Test for 5-7V between each audio signal circuit terminal 1 and terminal 2 and ground.
    • If less than 5V 
    1. Ignition OFF, disconnect the appropriate speaker harness connector at the A11 Radio.
    2. Test for infinite resistance between the signal circuits and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2Ω in the signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the A11 Radio.
    • If greater than 7V 
    1. Ignition OFF, disconnect the appropriate speaker harness connector at the A11 Radio. Ignition ON.
    2. Test for less than 1V between the signal circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the A11 Radio.
    • If between 5-7V 
  3. Test or replace the P19 Speaker.
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