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Home >> Hummer >> 2008 >> H3 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 361 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B2455 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2009 Cadillac STS. 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. Test for less than 10 Ω between the drain circuit terminal 2 and ground.
    • If greater than the specified range, test the circuit for an open/high resistance.
  3. Ignition ON, test for 9.5-10.5 V between the signal circuit terminal 10 and ground.
    • If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CIM.
    • If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the CIM.
  4. If all circuits test normal, replace the inside rearview mirror.
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