Circuit Description
The lateral accelerometer performs a self test at initialization. The output of the sensor will be offset by a fixed amount for a short period of time after the EBTCM powers up. The test will run under the following conditions:
| • | The ignition is ON. |
| • | All 4 wheel speeds are 0 km/h (0 mph). |
| • | The steer angle is within 90 degrees of centered. |
Conditions for Setting the DTC
The EBTCM does not detect the expected change in the lateral accelerometer input after initialization.
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
| • | During diagnosis, park the vehicle on a level 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. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check |
2 |
Are DTCs C1221-C1235, C1282, or C1285 present? | -- | Go to Step 3 | |
3 | Replace the lateral accelerometer. Refer to Lateral Accelerometer Replacement . Did you complete the repair? | -- | Go to Step 4 | -- |
4 |
Did DTC C1284 reset as a current DTC? | -- | Go to Step 5 | Go to Diagnostic System Check |
5 | Replace the EBTCM. Refer to Electronic Brake Control Module Replacement . Did you complete the repair? | -- | Go to Diagnostic System Check | -- |
