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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 135 (Immobilizer System) >> Diagnostic Information and Procedures >> DTC B302A >> Circuit/System Verification

Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the OnStar system is operating properly. Refer to OnStar Symptom Diagnosis .
  2. With a master vehicle key, turn the ignition ON.
  3. Observe the security indicator. After approximately 10 minutes, the indicator will turn off.
  4. Turn the ignition OFF and wait 5 seconds.
  5. Repeat steps 2-4 two more times for a total of 3 cycles or 30 minutes.
  6. With a master vehicle key, turn the ignition ON. The start disable will now be cleared.
  7. With a scan tool, clear any DTCs.
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