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Home >> GMC >> 2013 >> Sierra 1500 XFE >> Repair and Diagnosis >> External Pages >> Different car >> Section 1839 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B1287 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2011 GMC Sierra, 2011 GMC Cab & Chassis Sierra, 2011 Chevrolet Silverado, and 2011 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X3 harness connector at the audio amplifier.
  2. Ignition ON, radio ON and un-muted, test for 0.5-1.0 volts between the amplifier control circuit terminal 11 and ground.
    • If greater than the specified value, test the amplifier control circuit for a short to voltage. If the circuit tests normal, replace the radio.
    • If less than the specified value, test the amplifier control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  3. If all circuits test normal, replace the amplifier.
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