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 and perform the necessary inspections?

Go to Step 2

Go to Steering Wheel and Column Description and Operation

2

Verify that the lock system does not lock.

Does the ignition lock cylinder solenoid operate normally?

System OK

Go to Step 3

3

Verify the operation of the ignition lock cylinder solenoid.

Is the ignition lock cylinder solenoid and linkage operation smooth when manually operated?

Go to Step 4

Go to Step 11

4

Verify the electrical operation of the ignition lock cylinder solenoid. Refer to Ignition Can/Cannot Be Turned Off with Transmission in Any Gear .

Does the ignition lock cylinder solenoid operate normally?

Go to Step 7

Go to Step 5

5

Inspect the lock cylinder solenoid plunger.

Does the plunger exhibit scratches or signs of wear?

Go to Step 11

Go to Step 6

6

Inspect the ignition lock cylinder solenoid spring.

Is the solenoid spring assembled and operating normally?

Go to Step 7

Go to Step 9

7

Inspect for a faulty lock cylinder or release button.

Is the lock cylinder or release button damaged?

Go to Step 10

Go to Step 8

8

Inspect the ignition lock cylinder case.

Is the case worn or damaged?

Go to Step 11

Go to Step 12

9

Replace the Ignition Lock Cylinder Solenoid and spring . Refer to Ignition Lock Cylinder Replacement .

Did you complete the repair?

Go to Step 12

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10

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

Did you complete the repair?

Go to Step 12

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11

Replace the ignition lock cylinder case housing. Refer to Ignition Lock Cylinder Case Replacement .

Did you complete the repair?

Go to Step 12

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12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2