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Home >> GMC >> 2018 >> Terrain SL >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures >> Diagnostic Information And Procedures >> DTC B123E: Radio Keypad Button Signal Circuit >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition On/vehicle in Service Mode.
  2. Verify that each button on the A22 radio controls operates normally by pressing each button individually.
    • If none of the buttons operate normally 

      Refer to Circuit/System Testing

    • If some, but not all, of the buttons operate normally 

      Test or replace the A22 radio controls

    • Go to next step: If all of the buttons operate normally 
  3. All OK
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