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Home >> GMC >> 2014 >> Terrain SLT, 4D Utility >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (Cellular Systems, Entertainment Systems & Navigation Systems) >> Diagnostic Information and Procedures >> DTC B1287 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Terrain and 2010 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 harness connector at the A11 radio.
  2. Ignition ON, test for less than 1 V between the radio audio mute signal terminal 37 and ground.
    • If greater than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the T3 amplifier.
  3. Ignition OFF, test for greater than 20 Ω between the radio audio mute signal terminal 37 and ground.
    • If less than the specified value, test the circuit for a short to ground. If the circuit tests normal, replace the T3 amplifier.
  4. Ignition OFF, disconnect the X3 harness connector at the T3 amplifier.
  5. Test for less than 5 Ω between the radio X1 terminal 37 to the amplifier X3 terminal 6.
    • If greater than specified range, test the circuit for an open/high resistance.
  6. If all circuits test normal, replace the A11 radio.
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