• | 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 |
---|---|---|---|---|
Ignition Voltage | C0186 00 | C0186 00 | -- | C0186 5A, C0186 3B, C0186 1A |
Low Reference | C0186 00 | C0186 00 | C0186 00 | C0186 5A, C0186 3B, C0186 1A |
CAN Bus High Serial Data | C0186 00 | C0186 00 | C0186 00 | C0186 5A, C0186 3B, C0186 1A |
CAN Bus Low Serial Data | C0186 00 | C0186 00 | C0186 00 | C0186 5A, C0186 3B, C0186 1A |
The lateral accelerometer and the yaw rate sensors are combined into one sensor external to the electronic brake control module (EBCM). The vehicle stability enhancement system (VSES) uses the lateral accelerometer input when calculating the desired yaw rate. The yaw rate/lat sensor communicates with the EBCM via discrete CAN Bus High and CAN Bus Low serial data circuits.
Ignition ON.
• | The yaw/lateral combination sensor reports an internal failure. |
• | The yaw/lateral combination sensor learns a wrong offset value. |
• | Incorrectly mounted yaw/lateral sensor. |
• | The EBCM disables the VSES for the duration of the ignition cycle. |
• | A DIC message and/or a warning indicator may be displayed. |
• | The condition for the DTC is no longer present. |
• | The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Antilock Brake System Schematics
Control Module References for scan tool information
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. |
⇒ | If not within the specified range, test the ignition voltage circuit for a short to ground or open/high resistance. |
• | CAN Bus High serial data circuit terminal 18 |
• | CAN Bus Low serial data circuit terminal 19 |
⇒ | If greater than the specified value, test the appropriate serial data circuit for a short to voltage. |
• | CAN Bus High serial data circuit terminal 18 |
• | CAN Bus Low serial data circuit terminal 19 |
⇒ | If not the specified value, test the appropriate serial data circuit for a short to ground. |
• | CAN Bus High serial data circuit terminal 18 at the EBCM harness connector and terminal 2 at the yaw/lat sensor harness connector. |
• | CAN Bus Low serial data circuit terminal 19 at the EBCM harness connector and terminal 1 at the yaw/lat sensor harness connector. |
⇒ | If greater than the specified range, test the appropriate serial data circuit for an open/high resistance. |
⇒ | If not the specified value, repair the serial data circuits for a short together. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup, and programming