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Home >> GMC >> 2016 >> Terrain SL, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Radio Controls Malfunction (with Monochrome Display) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2015 GMC Terrain and 2015 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify no DTCs are present.
    • If no DTCs are present. 
  2. Ignition ON, A11 Radio ON.
  3. Verify that all radio controls operate and perform the correct function.
    • If some, but not all, controls operate normally. 

      Replace the A20 Radio/HVAC Controls.

    • If all controls are inoperative. 

      Refer to Circuit/System Testing

    • If all radio controls operate and perform the correct function. 
  4. All OK.
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