Circuit Description
Steer angle centering is the process by which the EBTCM calibrates the steering sensor output so that it reads zero when the steering wheel is centered. The initial steering wheel center position is calculated by using the inputs from the yaw rate sensor, the lateral accelerometer, and the wheel speed sensors. The initial steering wheel center position is calculated after driving 10 seconds in a straight line on a level surface at a speed greater than 10 km/h (6 mph).
The initial steering wheel center position will be determined quickly unless there is a large offset in the yaw rate sensor or lateral accelerometer. When this condition occurs, the system will believe that the steering wheel is far off center even though the vehicle is being driven in a straight line.
Conditions for Setting the DTC
All of the following conditions occur:
| • | The vehicle speed is greater than 40 km/h (25 mph). |
| • | The vehicle has been driven for 10 minutes without completing steer angle centering. |
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 Diagnosis in Wiring Systems. |
| • | The Snapshot function on the scan tool can help find an intermittent DTC. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Are DTCs C1221-C1235, C1282, or C1284-C1288 present? | -- | Go to Step 3 | |
3 |
Is the voltage within the specified range? | 2.05-2.60 V | Go to Step 5 | Go to Step 4 |
4 | Replace the steering wheel position sensor (SWPS). Refer to Steering Shaft, Lower Bearing, and Jacket - Disassemble - Off Vehicle in Steering Wheel and Column - Tilt. Did you complete the repair? | -- | -- | |
5 |
Is the voltage within the specified range? | 2.3-2.7 V | Go to Step 7 | Go to Step 6 |
6 | Replace the lateral accelerometer. Refer to Lateral Accelerometer Replacement . Did you complete the repair? | -- | -- | |
7 | Use a J 39200 DMM in order to measure the voltage between the J 39700 terminal 21 and terminal B. Is the voltage within the specified range? | 2.3-2.7 V | Go to Step 9 | Go to Step 8 |
8 | Replace the yaw rate sensor. Refer to Vehicle Yaw Sensor Replacement . Did you complete the repair? | -- | -- | |
9 |
Did DTC C1283 set as a current DTC? | -- | Go to Step 10 | |
10 | Replace the EBTCM. Refer to Electronic Brake Control Module Replacement . Did you complete the repair? | -- | -- |
