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Home >> Hummer >> 2008 >> H2 4D Utility Pickup >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Cellular, Entertainment, And Navigation) >> 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 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the inside rearview mirror harness connector .
  2. Ignition ON,test for less than 1 ohm between the inside rearview mirror harness connector terminal E and ground.
    • If greater than specified value repair open or high resistance. or replace the VCIM.
  3. With a scan tool command the green LED ON. Test for 9.2 to 10.2 volts at the inside rearview mirror harness connector terminal F and ground.
    • If 9.2 to 10.2 volts is not present with the green LED is commanded ON, repair open or high resistance. or replace the VCIM
  4. With a scan tool command the red LED ON. Test for 9.2 to 10.2 volts the inside rearview mirror harness connector terminal G and ground.
    • If 9.2 to 10.2 volts is present with the red LED is commanded ON, repair open or high resistance. or replace the VCIM
  5. If all circuits test normal, test or replace the Rear View Mirror.
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