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Home >> Hummer >> 2010 >> H3T Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 74 (Cruise Control System) >> Diagnostic Information and Procedures >> Cruise Control Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Canyon and 2010 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X204 harness connector at the turn signal/multifunction switch.
  2. Ignition OFF, disconnect the run/crank relay, install a 20 A fused jumper wire between terminals 30 and 87 in the underhood fuse block.
  3. Verify that a test lamp illuminates between the B+ circuit terminal A8 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Ignition OFF, test for less than 2.5-3.0k Ω between terminal B8 and ground.
    • If less that the specified range, test the signal circuit for a short to ground. If the circuit tests normal replace the ECM.
    • If greater that the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, replace the turn signal/multifunction switch.
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