Circuit Description
The EBTCM learns the steering wheel center position in every drive cycle. Once established, the steering wheel center position should remain fairly constant.
Conditions for Setting the DTC
All of the following conditions occur:
| • | The steering angle has been centered. |
| • | The center steer angle bias value is more than 20 degrees from the initial center position. |
Action Taken When the DTC Sets
| • | A malfunction DTC is stored. |
| • | Stabilitrak® is disabled. |
| • | The DIC displays the SERVICE STABILITY SYS message. |
| • | The ABS/TCS remain functional. |
Conditions for Clearing the DTC
| • | The condition for DTC is no longer present and you used scan tool Clear DTCs function. |
| • | The condition for DTC is no longer present and you used the On-Board Clear DTCs function. |
| • | The EBTCM does not detect the DTC in 50 drive cycles. |
Diagnostic Aids
| • | Check the vehicle for proper alignment. The car should not pull in either direction while driving straight on a flat surface. |
| • | Find out from the driver under what conditions the DTC was set (when the DIC displayed the SERVICE STABILITY SYS message). This information will help to duplicate the failure. |
| • | Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. |
| • | Poor connections, broken insulation, or a break in the wire inside the insulation may cause an intermittent malfunction. |
| • | If an intermittent malfunction exists, refer to Intermittents and Poor Connections in Wiring Systems. |
| • | The Snapshot function on the scan tool can help find an intermittent DTC. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | Go to Step 2 | Go to Diagnostic System Check |
2 |
Are DTCs C1282-C1285 present? | -- | Go to Step 3 | |
3 | Using a scan tool, perform the Steering Wheel Position Sensor Test. Refer to Scan Tool Diagnostics . Is the analog and digital display on the scan tool within ±5 degrees of each other at the center (zero) position? | -- | Go to Step 5 | Go to Step 4 |
4 | Replace the steering wheel position sensor. Refer to Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement in Variable Effort Steering. Is the replacement complete? | -- | Go to Step 9 | -- |
5 | Perform the Diagnostic Test Drive while monitoring the Yaw Rate Input parameter on a scan tool. Is the voltage within the specified range? | 2.3-2.7 V | Go to Step 7 | Go to Step 6 |
6 | Replace the yaw rate sensor. Refer to Vehicle Yaw Sensor Replacement . Is the replacement complete? | -- | Go to Step 9 | -- |
7 |
Is the voltage within the specified range? | 2.3-2.7 V | Go to Step 9 | Go to Step 8 |
8 | Replace the lateral accelerometer. Refer to Lateral Accelerometer Replacement . Is the replacement complete? | -- | Go to Step 9 | -- |
9 |
Did DTC C1286 set as a current DTC? | -- | Go to Step 10 | Go to Diagnostic System Check |
10 | Replace the EBTCM. Refer to Electronic Brake Control Module Replacement . Is the replacement complete? | -- | Go to Diagnostic System Check | -- |
