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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1139 (Immobilizer System) >> Diagnostic Information and Procedures >> DTC B302A (without RPO Y41) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. With a master vehicle key, turn the ignition ON.
  2. Observe the security indicator. After approximately 10 minutes, the indicator will turn off.
  3. Turn the ignition OFF and wait 5 seconds.
  4. Repeat steps 2-4 two more times for a total of 3 cycles or 30 minutes.
  5. With a master vehicle key, turn the ignition ON. The start disable will now be cleared.
  6. With a scan tool, clear any DTCs.
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