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Home >> Saturn >> 2009 >> Sky Red Line, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information & Procedures >> DTC B1287 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac DTS. 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 amplifier.
  2. Ignition ON, radio ON, test for 0.6-1.0 volts at the radio audio mute signal X3 terminal 7 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
    • If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the radio.
  3. Press the phone mute button on the steering wheel control switch. Test for 6.0-8.0 volts at the radio audio mute signal X3 terminal 7 and ground.
    • If not within the specified range, replace the radio.
    • If all circuits test normal, replace the amplifier.
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