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Home >> Saturn >> 2005 >> Relay AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 170 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> OnStar Button LED Inoperative >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac Montana SV6, 2007 Chevrolet Uplander, and 2007 Buick Terraza. 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 6.8-7.2 volts between the inoperative keypad LED signal, terminal 3 green or terminal 2 red and ground.
    • If less than the specified value, test the green/red LED for an open/high resistance, or a short to ground. If circuit tests normal, test or replace the VCIM.
    • If greater than the specified value, test the green/red LED for a short to voltage. If circuit tests normal, test or replace the VCIM and the inside rearview mirror.
  3. If all circuits test normal, test or replace the inside rearview mirror.
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