SMU - Revised Steering Wheel and Column Service Information - Description and Operation,Control Module Setup (SCLM Setup), DTC B2907, DTC B2910
| Subject: | Revised Steering Wheel and Column Service Information: Description and Operation, Control Module Setup (SCLCM Setup), DTC B2907, DTC B2910 |
| Models: | 2004 Cadillac XLR |
| with RPOs MAE, C4E (Europe Only) |
This bulletin is being issued to revise various Service Information procedures in the Steering Wheel and Column sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.
The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.
Steering Wheel and Column Description and Operation (SI Document ID 899508)
Tilt/Telescoping Description
The tilt/telescoping function of this column consists of the tilt/telescoping drive motors, the tilt/telescoping motor position sensors and the tilt/telescoping switch. The tilt/telescoping motor position sensors are an internal part of the tilt/telescoping steering motor. The tilt/telescoping switch operates the inward, outward, upward, or downward movement of the steering wheel.
The energy absorbing and locking steering column includes three important features in addition to the steering function.
- The steering column is energy absorbing and is designed to compress in a front-end collision which will lessen the chance of injury to the driver.
- The steering column has a tilt/telescoping control system that consists of an electronic control module capable of class 2 serial data communication, a steering column power assembly with positioning motor and sensor, and a steering column control switch.
- The multi-function lever provides for the control of the headlamp high beams, and the windshield washer and wiper.
The steering column may be removed, disassembled and reassembled with relative ease. It is important to use only the specified screws, bolts and nuts and to tighten them to the specified torque in order to ensure the proper energy absorbing functions. When the steering column assembly is removed from the vehicle, special care must be taken in handling it. Avoid the use of a steering wheel puller other than the special one recommended in this manual. Sharply striking the end of the steering shaft, leaning on the assembly or dropping the assembly could shear off or loosen the plastic fasteners which maintain the steering column rigidity.
Tilt/Telescoping Operation
The tilt/telescoping steering column in/out/up/down switch is an input to the driver position module (DPM). The tilt/telescoping drive motor is an output function of the DPM.
Steering column memory settings are stored in the DPM. The steering column position sensor is an internal part of the tilt/telescoping motor assemblies, and is an input to the DPM. The DPM uses the position sensor input when storing and recalling memory settings.
Memory steering column, and the easy enter/exit operations are performed by the DPM. Commands for memory operations are sent to the DPM as class 2 messages by the driver door switch module (DDS).
Steering Wheel Theft Deterrent Lock Operation
The steering column lock control module (SCLCM) controls the steering wheel theft deterrent lock function, which allows the column to be electronically locked. The SCLCM controls the column lock motor using an internal lock relay, an internal unlock relay, and an internal lock enable relay. The lock and unlock relays provide a low input to the column lock motor. When the column needs to be locked the lock enable relay will energize the lock relay, which provides a high input to the lock side of the motor, energizing the motor to lock the steering column.
In order for the steering column to be locked the SCLCM has to see 3 inputs. The first input the module needs to see is the vehicle in the park position (automatic transmission shift lever). When the shift lever is in the park position, the switch internal to the automatic transmission shift lever closes sending a high input to the SCLCM and the body control module (BCM). When this occurs the lock relay (internal to the SCLCM) is energized closing the lock relay switch.
The second input to the SCLCM is the ignition state. The RCDLR and the BCM look at the power mode. When the ignition 1 input is in the off state or RAP mode, the RCDLR sends a class 2 message to the SCLCM indicating this state which will lock the column.
The third input the SCLCM receives comes from the BCM enable relay. When the BCM goes to the off power mode then the low input is sent to the SCLCM.
When the SCLCM receives this low input from the BCM the internal lock enable relay is energized and provides a high input to the lock side of the column lock motor. The unlock side of the column lock motor is grounded through the internal unlock relay within the SCLCM. The column lock motor will send an input back to the SCLCM indicating the motor is energized for the locked position. This results in the locking of the steering column.
The SCLCM will unlock the steering column if the power mode is on and the SCLCM and RCDLR passwords match.
The SCLCM monitors the column lock system and will set DTC codes when the module detects malfunctions within the system. When a malfunction occurs the driver information center (DIC) will display the Service Column Lock Now message indicating DTC codes are set within the SCLCM.
Control Module Setup (SCLCM Setup) (SI Document ID 1331317)
Important:
• When replacing a steering column lock control module (SCLCM) with a GM
SPO Replacement Part, insure the procedure to setup a new SCLCM is performed. • When replacing an SCLCM with a GM SPO Replacement Part, the new SCLCM
will learn the incoming fuel continue password of the remote control door lock receiver
(RCDLR) immediately upon the next ignition switch from OFF to CRANK. A SCLCM which
had been installed in another vehicle will have learned the fuel continue password
of the other vehicles RCDLR. Perform the SCLCM procedure to learn the fuel continue
password of the current vehicles RCDLR.
Tools Required
Scan Tool
Set Up Steering Column Lock Control Module
- Turn ON the ignition, with the engine OFF.
- Connect a scan tool to the vehicle.
- With a scan tool, select Vehicle Control Systems.
- Select Computer/Integrating Systems.
- Select Module Replacement/Setup.
- Select SCLCM Setup (Export Only).
- Select SCLCM Setup.
- Follow the scan tool on-screen instructions.
DTC B2907 (SI Document ID 913231)
Circuit Description
An input the steering column lock control module (SCLCM) receives comes from the body control module (BCM) enable relay. When the BCM goes to the off power mode then the low input is sent to the SCLCM.
Conditions for Running the DTC
| • | DTCs B1327 or B1328 are not set as current. |
| • | The condition must be present for 300 ms. |
Conditions for Setting the DTC
When the SCLCM is locking the column but no input has been received on the steering column lock control circuit from the BCM.
Action Taken When the DTC Sets
| • | Stores a DTC B2907 in the SCLCM memory. |
| • | Stores a DTC B2907.01 in the BCM memory for a short to battery in the steering column lock control circuit. |
| • | Stores a DTC B2907.06 in the BCM memory for an open or a short to ground in the steering column lock control circuit. |
| • | The SCLCM will command the Service Column Lock Now to turn ON in the DIC. |
Conditions for Clearing the MIL/DTC
| • | When the SCLCM is locking the column and ground has been received on the steering column lock control circuit for 300 ms. |
| • | A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present. |
| • | Use a scan tool. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Column/Ignition Lock Schematics Connector End View Reference: Steering Wheel and Column Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 3 | Go to Diagnostic System Check in Vehicle DTC Information |
2 |
Does the scan tool display Disabled? | Go to Step 5 | Go to Step 3 |
3 | With a scan tool, observe the Column Lock Relay Signal parameter in the data list for the body control module (BCM). Does the scan tool display Off? | Go to Step 6 | Go to Step 4 |
4 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 7 |
5 | Inspect for poor connections at the harness connector of the SCLCM. Refer to Testing for Intermittent and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 8 |
6 | Repair an open, a short to ground, or a short to battery in the steering column lock control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 9 | -- |
7 | Replace the BCM. Refer to Body Control Module Replacement. Did you complete the replacement? | Go to Step 9 | -- |
8 |
Important: Always perform the setup procedure for the SCLCM. Refer to Control Module Setup.
Did you complete the replacement? | Go to Step 9 | -- |
9 |
Does the DTC reset? | Go to Step 2 | System OK |
DTC B2910 (SI Document ID 914048)
Circuit Description
The steering column lock control module (SCLCM) will unlock the steering column if the power mode is on and the SCLCM and RCDLR passwords match.
Conditions for Running the DTC
| • | DTCs B1327 or B1328 are not set as current. |
| • | The condition must be present for 300 ms. |
Conditions for Setting the DTC
This DTC will set if the SCLCM password does not match RCDLR password.
Action Taken When the DTC Sets
| • | Stores a DTC B2910 in the SCLCM memory. |
| • | The SCLCM will command the Service Column Lock Now to turn ON in the DIC. |
Conditions for Clearing the MIL/DTC
| • | The stored SCLCM password matches the password from the RCDLR. |
| • | Use a scan tool. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Column/Ignition Lock Schematics Connector End View Reference: Steering Wheel and Column Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the DTC reset? | Go to Step 3 | Go to Step 4 |
3 |
Important: Always perform the setup procedure for the SCLCM. Refer to Control Module Setup.
Did you complete the replacement? | Go to Step 4 | -- |
4 |
Does the DTC reset? | System OK | -- |
