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Circuit/System Testing

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X176 24-way harness connector at the transmission, then the X1 16-way harness connector at the transmission, verify that a test lamp does not illuminate between the ignition voltage circuit terminal 12 and ground.
    • If the test lamp illuminates, test the ignition voltage circuit for a short to voltage.
  2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 12 and ground.
    • If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance.
    • If the circuit tests normal replace the Q8 control solenoid valve assembly.
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