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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN K1500, 5.3 ZREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 542 (STEERING WHEEL AND STEERING COLUMN)DIAGNOSTIC INFORMATION AND PROCEDURESELECTRONIC COLUMN LOCK DOES NOT UNLOCKDIAGNOSTIC AIDS
2006 Chevrolet Suburban K1500, 5.3 Z

Diagnostic Aids

2006 Chevrolet Suburban K1500, 5.3 ZSECTION Diagnostic Aids
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  • An internally open or shorted steering column lock relay may cause the column to not unlock.
  • An open on the key in ignition switch signal circuit will intermittently cause the column to not unlock.
  • Disconnecting or opening the steering column lock feedback circuit will cause the body control module (BCM) to enter Fail Enable Standby mode. The steering column will remain inoperative until the Fail Enable Standby mode is cleared. To clear this mode, disconnect the BCM1 & instrument panel cluster (IPC) fuse in the instrument panel (I/P) fuse block for 15 seconds.

Methods to free a stuck electric column lock:

  • Run the engine at a high idle if the battery is low. Use the scan tool output controls to try to unlock the column.
  • Torque the steering wheel back and forth against the column lock bolt.
  • Turn the air conditioner vents toward the steering column to cool the lock motor.
  • Connect a battery charger directly to the lock motor leads and use the highest voltage setting.
  • Connect a battery in series with a battery charger directly to the lock motor leads. Start at the lowest voltage setting. Do not exceed 28 volts for 1 second maximum.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.