GM Service Manual Online
For 1990-2009 cars only

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 Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Steering Wheel and Column

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 lock control adjustment.

Is the automatic transmission shift lock control adjusted incorrectly?

Go to Step 10

Go to Step 6

6

Inspect the lock module assembly for damage.

Is the lock module 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

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9

Replace the lock cylinder. Refer to Ignition Lock Cylinder Replacement - On Vehicle .

Did you complete the repair?

Go to Step 13

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10

Adjust the automatic transmission shift lock control. Refer to Automatic Transmission Shift Lock Actuator Replacement in Shift Lock Control.

Did you complete the repair?

Go to Step 13

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11

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

Tighten the lock module assembly. Refer to Fastener Tightening Specifications .

Did you complete the repair?

Go to Step 13

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12

Replace the ignition switch. Refer to Ignition Switch Replacement - On Vehicle .

Did you complete the repair?

Go to Step 13

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13

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3