• | 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 |
---|---|---|---|---|
5-Volt Reference | C0880 00, C12E5, C0880 02, C120F | C0455 39 | C0880 00, C12E5 | -- |
Steering Angle Sensor Signal | C0455 39 | C0455 39 | C0455 39 | C0455 09, C0455 0A, C0455 19 |
Steering Angle Sensor Phase A Signal | C0455 5A | C0455 5A | C0455 39 | C0455 09, C0455 0A, C0455 19 |
Steering Angle Sensor Phase B Signal | C0455 5A | C0455 5A | C0455 39 | C0455 09, C0455 0A, C0455 19 |
Steering Angle Sensor Index Signal | -- | -- | C0455 39 | C0455 09, C0455 0A, C0455 19 |
Low Reference | C0294 00, C120C, C12F8, C0161 04, C127D, C0880 00, C12E5, C0455 39 | -- | -- | -- |
The electronic brake control module (EBCM) monitors the Phase A , Phase B, Index and Analog signal circuits from steering angle sensor. The analog signal is used along with the index pulse to calibrate the steering angle sensor (SAS). The SAS position is then determined by Phase A and Phase B signals. The 2 input signals Phase A and Phase B are approximately 90 degrees out of phase. Once calibrated, the EBCM dynamically interprets the relationship between the Phase A and Phase B inputs, and determines the position of the steering wheel and the direction of the steering wheel rotation.
• | Ignition ON. |
• | Ignition voltage is greater than 10 volts. |
The EBCM detects an internal sensor failure.
The EBCM detects the steering-angle signal not changing while the yaw rate signal changes.
The EBCM detects a short to voltage, short to ground or an open/high resistance on one of the steering angle sensor circuits.
• | The EBCM disables the vehicle stability enhancement system (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 40 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 the circuit tests normal, replace the EBCM. |
⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM. |
⇒ | If greater than the specified range, test the signal circuit terminal 6 for a short to voltage. If the circuit tests normal, replace the EBCM. |
⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM. |
⇒ | If not the specified parameter, test the signal circuit terminal 7 for a short to ground. If the circuit tests normal, replace the EBCM. |
⇒ | If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the EBCM. |
⇒ | If not the specified parameter, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the EBCM. |
⇒ | If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the EBCM. |
⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for EBCM replacement, setup, and programming |