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Home >> Cadillac >> 2002 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1408 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> OnStar One or More Buttons Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  2. Ignition ON, test for voltage between 9.8-10.2 volts between the supply voltage, terminal 6 and ground.
    • If less than specified values, test the circuit for an open/high resistance, or for a short to ground. If the circuit tests normal, test or replace the VCIM.
    • If more than specified values, test the circuit for a short to voltage. If the circuit tests normal, test or replace the VCIM.
  3. If the circuit tests normal, test or replace the inside rearview mirror.
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