Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B2910: Steering Column Lock Password IncorrectCircuit/System Description
Both the steering column lock control module (SCLCM) and the instrument panel module (IPM) have passwords stored in memory, that are required to match in order to unlock the steering column. When the ignition is turned ON, the SCLCM receives a password from the IPM on the low speed GMLAN serial data bus. The SCLCM will unlock the steering column if the power mode is on and the SCLCM and IPM passwords match. If the SCLCM and IPM passwords do not match, the steering column will not unlock and DTC B2910 will set.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | DTCs B1327 or B1328 are not set as current. |
Conditions for Setting the DTC
The SCLCM password does not match IPM password.
Actions Taken When DTC Sets
| • | The steering column will not unlock. |
| • | DTC B2910 is stored in the SCLCM memory. |
| • | The SCLCM will command the driver information center (DIC) to display the Service Column Lock Now message. |
Conditions for Clearing the DTC
The stored SCLCM password matches the password from the IPM.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Steering Wheel and Column Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Verify that there are no DTCs in the IPM.
- Perform the setup procedure for the SCLCM. Verify that DTC B2910 does not set again after the setup is complete.
| ⇒ | If there are any DTCs in the IPM, diagnose those DTCs first. |
| ⇒ | If DTC B2910 sets after setting up the SCLCM, replace the SCLCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for SCLCM or IPM replacement, setup, and programming
