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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, C0196 71, |
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, C0196 71, |
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 high speed controller area network (CAN) 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 is not plausible with the lateral acceleration sensor signal, steering angle sensor signal and vehicle speed. for 0.25-2 seconds
The yaw rate sensor offset is out of specified range.
The yaw rate sensor signal is out of specified range.
| • | 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 not OK |
| If loose or incorrect installation is diagnosed, correct the installation of the component. |
| ⇒ | If the DTC C0186, C0196, or C019B sets |
| 3.1. | Perform the Vehicle Yaw Sensor Learn prior to this diagnostic. |
| 3.2. | If the DTCs sets, refer to Circuit/System Testing. |
| ⇓ | If the DTC does not set |
| ⇒ | If 5 Ω or greater |
| 2.1. | Ignition OFF. |
| 2.2. | 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 the lamp does not illuminate |
| 4.1. | Ignition OFF, disconnect the harness connector at the K17 Electronic Brake Control Module and the B99 Steering Wheel Angle Sensor. |
| 4.2. | 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, replace the K17 Electronic Brake Control Module. |
| ⇓ | If the test lamp illuminates |
| ⇒ | If the DTC sets |
| Replace the K17 Electronic Brake Control Module. |
| ⇓ | If the DTC does not set |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for EBCM replacement, setup and programming |
| © Copyright Chevrolet. All rights reserved |
| © Copyright Chevrolet. All rights reserved |
