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Home >> Chevrolet >> 2012 >> Chevy Express H1500, Van Cargo >> Repair and Diagnosis >> External Pages >> Different car >> Section 1921 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> OnStar Button Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2011 GMC Savana Special, 2011 GMC Savana Camper Special, 2011 GMC Savana, 2011 Chevrolet RV Cutaway, and 2011 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the OnStar® button assembly.
  2. Test for less than 10 Ω between the OnStar® button assembly ground circuit terminal E and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for less than 1 V between the keypad signal circuit terminal B and ground.
    • If greater than the specified range, test the keypad signal circuit for a short to voltage. If the circuit tests normal, replace the VCIM.
  4. Ignition OFF, test for 600k-800k Ω between the keypad signal circuit terminal B and ground.
    • If less than the specified range, test the keypad signal circuit for a short to ground. If the circuit tests normal, replace the VCIM.
    • If greater than the specified range, test the keypad signal circuit for an open/high resistance. If the circuit tests normal, replace the VCIM.
  5. Ignition ON, test for 9.5-10.5 V between the keypad supply voltage circuit terminal A and ground.
    • If less than the specified range, test the supply voltage circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the VCIM.
    • If greater than the specified range, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the VCIM.
  6. If all circuits test normal, test or replace the OnStar® button assembly.
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