Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSBUICK2005LESABRE LIMITED, 4T65E/M15REPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTIGNITION SWITCH/STEERING LOCKSTEERING WHEEL & STEERING COLUMNDIAGNOSTIC INFORMATION AND PROCEDURESLOCK SYSTEM DOES NOT UNLOCK
2005 Buick LeSabre Limited, 4T65E/M15
Lock System Does Not Unlock
2005 Buick LeSabre Limited, 4T65E/M15SECTION Lock System Does Not Unlock
Lock System Does Not Unlock
| Step | Action | Yes | No |
|---|---|---|---|
| DEFINITION: The lock system does not allow the key to rotate out of the OFF position. | |||
| 1 | Did you review the Steering Wheel and Column System Description? | Go to Step 2 | Go to Steering Wheel and Column Description and Operation |
| 2 | Verify that the lock system does not unlock. Does the lock system operate normally? |
System OK | Go to Step 3 |
| 3 | Inspect for an incorrect, worn, or damaged key. Is the key incorrect, worn, or damaged? |
Go to Step 8 | Go to Step 4 |
| 4 | Inspect for a faulty lock cylinder. Is the lock cylinder damaged? |
Go to Step 9 | Go to Step 5 |
| 5 | Inspect the automatic transmission shift control adjustment. Is the automatic transmission shift control adjusted incorrectly? |
Go to Step 10 | Go to Step 6 |
| 6 | Inspect the ignition lock cylinder case assembly for damage. Is the ignition lock cylinder case assembly damaged? |
Go to Step 11 | Go to Step 7 |
| 7 | Inspect the ignition switch assembly for damage. Is the ignition switch assembly damaged? |
Go to Step 12 | Go to Step 3 |
| 8 | Replace the key. Refer to Key and Lock Cylinder Coding
in General Information. Did you complete the repair? |
Go to Step 13 | - |
| 9 | Replace the lock cylinder. Refer to Ignition Lock Cylinder Replacement . Did you complete the repair? |
Go to Step 13 | - |
| 10 | Adjust the A/T shift control. Refer to Automatic Transmission Shift Lock Actuator Replacement
in Shift Lock Control. Did you complete the repair? |
Go to Step 13 | - |
| 11 | Replace the ignition lock cylinder case assembly. Refer to Ignition Lock Cylinder Case Replacement . Did you complete the repair? |
Go to Step 13 | - |
| 12 | Replace the ignition switch. Refer to Ignition Switch Replacement . Did you complete the repair? |
Go to Step 13 | - |
| 13 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 3 |
RENDER: 1.0x
NO RELATED
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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.