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| • | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
12V Reference | U0125, U0126 | U0125, U0126 | -- | -- |
CAN Bus High Serial Data | U0073, U0100, U0101, U0125, U0126, U0140 | U0073, U0100, U0101, U0125, U0126, U0140 | U0073, U0100, U0101, U0125, U0126, U0140 | C0186 5A, C0186 71, C0196 00, C0196 5A, C0287 5A |
CAN Bus Low Serial Data | U0073, U0100, U0101, U0125, U0126, U0140 | U0073, U0100, U0101, U0125, U0126, U0140 | U0073, U0100, U0101, U0125, U0126, U0140 | C0186 5A, C0186 71, C0196 00, C0196 5A, C0287 5A |
Ground | -- | U0125 | -- | -- |
The yaw rate and lateral acceleration sensors are combined into one multi-axis acceleration sensor module, external to the electronic brake control module (EBCM). The EBCM supplies a 12 V reference voltage to the multi-axis acceleration sensor module. The multi-axis acceleration sensor module communicates with the EBCM via the serial data circuit. The EBCM activates the stability control function depending on multi-axis acceleration sensor module input.
Ignition ON
The lateral acceleration sensor is not calibrated.
The lateral acceleration sensor signal is not plausible with the yaw rate sensor signal, steering angle sensor signal and vehicle speed for 0.5-2 seconds.
The lateral acceleration sensor signal offset is out of specified range.
The yaw rate sensor signal is out of specified range.
The yaw rate sensor signal does not agree with the lateral acceleration sensor signal, steering angle sensor signal and vehicle speed for 0.25-2 s.
The longitudinal acceleration sensor signal is out of the specified range.
The longitudinal acceleration sensor signal is not plausible.
| • | The EBCM disables the stability control for the duration of the ignition cycle. |
| • | The traction control/stability control-active indicator turns ON. |
| • | A current DTC clears when the diagnostic runs and passes. |
| • | The EBCM will turn OFF the indicator in the next ignition cycle. |
Antilock Brake System Schematics
Control Module References for scan tool information
If any listed DTC are set
Refer to Vehicle Yaw Sensor Learn prior to this diagnostic.
If none of the listed DTCs are set
If loose or incorrect installation is diagnosed
Correct the installation of the component.
If the installation is correct
If 5 Ω or greater
| 3.1. | Ignition OFF. |
| 3.2. | Test for less than 2 Ω in the ground circuit end to end. |
If 2 Ω or greater, repair the open/high resistance in the circuit.
If less than 2 Ω, repair the open/high resistance in the ground connection.
If less than 5 Ω
If less than 11 V
| 4.1. | Ignition OFF, disconnect the harness connector at the K17 Electronic Brake Control Module. |
| 4.2. | Test for infinite resistance between the 12 V reference voltage circuit and earth. |
If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance
| 4.3. | Test for less than 2 Ω in the 12 V reference voltage circuit end to end. |
If 2 Ω or greater, repair the open/high resistance in the circuit.
If less than 2 Ω, replace the K17 Electronic Brake Control Module.
If greater than 11 V
If DTC resets
Replace the K17 Electronic Brake Control Module.
If DTC does not reset
Perform the Diagnostic Repair Verification after completing the repair.
| • | Control Module References for EBCM replacement, programming and setup |
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