GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

DEFINITION: The lock system will not allow the key to be turned to the OFF lock position.

1

Did you review the Steering Wheel and Column Description and Operation?

Go to Step 2

Go to Steering Wheel and Column Description and Operation

2

Verify that the lock system does not lock.

Does the lock system operate normally?

System OK

Go to Step 3

3

Inspect for a faulty lock cylinder or release button.

Is the lock cylinder or release button damaged?

Go to Step 7

Go to Step 4

4

Inspect the shift cable adjustment.

Is the shift linkage adjusted incorrectly?

Go to Step 8

Go to Step 5

5

Inspect the ignition switch for damage.

Is the ignition switch damaged?

Go to Step 9

Go to Step 6

6

Inspect the steering wheel theft deterrent lock for damage.

Is the steering wheel theft deterrent lock damaged?

Go to Step 10

Go to Step 3

7

Replace the lock cylinder. Refer to Ignition Lock Cylinder Replacement .

Did you complete the repair?

Go to Step 11

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8

Adjust the shift cable. Refer to Range Selector Lever Cable Adjustment or to Park Lock Cable Adjustment in Automatic Transaxle -- 4T65E.

Did you complete the repair?

Go to Step 11

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9

Replace the ignition switch. Refer to Ignition and Start Switch Replacement .

Did you complete the repair?

Go to Step 11

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10

Replace the steering wheel theft deterrent lock. Refer to Steering Wheel Theft Deterrent Lock Replacement .

Did you complete the repair?

Go to Step 11

--

11

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3