DEFINITION: The SERVICE COLUMN LOCK message is displayed or the steering column does not LOCK or UNLOCK.

Did you perform the Steering Column Lock Diagnostic System Check?

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Go to Step 2

Go to Steering Column Lock Diagnostic System Check

Use a scan tool to check for any steering column lock DTCs stored in the BCM.

Are any of the specified DTCs stored in the BCM?

DTC B2587

DTC B2588

DTC B2592

DTC B2593

Go to the Diagnostic System Check - Body Control System

Go to Step 3

Was the steering column connector C207 disconnected with the ignition switch in the ON position?

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Go to Step 21

Go to Step 4

1. Turn ON the ignition switch.
2. Using a scan tool, select BCM data display and monitor the BCM steering column lock state.

Does the scan tool display steering column lock state as ENABLE STDBY?

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Go to Step 7

Go to Step 5

1. Turn OFF the ignition switch.
2. Using a scan tool, select BCM data display and monitor the BCM key-IN-ignition status with the key IN then OUT of the ignition.

Does the scan tool indicate key-IN-ignition status as ACTIVE with the key IN the ignition and INACTIVE with the key OUT of the ignition?

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Go to Step 6

Go to Key-in-Ignition Chime Inoperative

1. Disconnect the steering column connector C207.

Important: The steering column connector C207 must be disconnected before reading key OUT-of-ignition status.

2. Using a scan tool, select BCM data display and monitor the key-OUT-of-ignition status with the key IN then OUT of the ignition.

Does the scan tool indicate key-OUT-of-ignition status as ACTIVE with the key OUT of the ignition and INACTIVE with the key IN the ignition?

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Go to Step 8

Go to Step 14

1. Disconnect the steering column connector C207.
2. Connect a test light to B+ and probe terminal A at connector C207 (harness side).

Is the test light ON?

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Go to Step 12

Go to Step 13

1. Turn OFF the ignition switch.
2. Remove the ignition key OUT of the ignition switch.
3. Connect a test light between terminal D and terminal C at the steering column connector C207 (harness side).
4. Use a scan tool to cycle the steering column lock motor.

Did the test light turn ON in both the lock and the unlock positions?

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Go to Step 18

Go to Step 9

1. Disconnect the steering column lock relay.
2. At the steering column lock relay connector, jumper terminals A2 and C1.
3. Connect a test light between terminal D and terminal C at the steering column connector C207 (harness side).
4. Use a scan tool to cycle the steering lock motor (lock/unlock).

Did the test light turn ON when the steering column is locked and unlocked?

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Go to Step 10

Go to Step 11

1. Connect a test light between terminal A1 and terminal C2 at the steering column lock relay connector (harness side).
2. Use a scan tool to cycle the steering lock motor (lock/unlock).

Did the test light turn ON when the steering column is locked and unlocked?

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Go to Step 17

Go to Step 15

1. Turn OFF the ignition switch.
2. Disconnect the BCM connectors C2 and C3.
3. At the harness side of the BCM connectors C2 and C3, check for continuity between terminals B8 and C6.

Is there continuity?

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Go to Step 16

Go to Step 14

Check for an open or short to ground in CKT 1601.

Was a problem found and repaired?

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Go to Step 21

Go to Step 18

Locate and repair open in CKT 150?

Is the repair complete?

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Go to Step 21

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Check for an open in CKT 159.

Was a problem found and repaired?

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Go to Step 21

Go to Step 19

Check for an open or short to ground in CKT 911 or CKT 2540.

Was a problem found and repaired?

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Go to Step 21

Go to Step 20

Check for an open or short to ground in CKT 1603, CKT 912 or CKT 1604.

Was a problem found and repaired?

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Go to Step 21

Go to Step 20

Replace the steering column lock relay.

Is the replacement complete?

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Go to Step 21

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Replace the steering column lock motor.

Is the replacement complete?

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Go to Step 21

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Replace the ignition lock cylinder.

Is the replacement complete?

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Go to Step 21

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1. Replace the BCM. Refer to Body Control Module Replacement .
2. Program the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration .

Is the replacement complete?

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Go to Step 21

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1. Turn the ignition switch to the OFF position.
2. Reconnect or install any connectors or components that were disconnected or removed.
3. Disconnect the BCM fuse #25 for 15 seconds to clear the BCM steering column fail enable mode.
4. Turn the ignition switch to the ON position.
5. Clear any BCM DTCs. Refer to Clearing DTCs in Body Control Systems.

Are all the DTCs cleared?

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Go to Steering Column Lock Diagnostic System Check

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