Diagnostic Instructions
| • | 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. |
DTC Descriptor
DTC U1650 00: Steering Wheel Sensor CAN MalfunctionDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
High Speed Serial Data Bus+ (between the EBCM and the steering angle sensor) | U1650 00 | -- | U1650 00 | -- |
High Speed Serial Data Bus- (between the EBCM and the steering angle sensor) | U1650 00 | -- | U1650 00 | -- |
Circuit Description
The controller area network (CAN) serial data circuit is a high speed serial data bus used to communicate information between the steering angle sensor and the electronic brake control module (EBCM). When the ignition switch is turned to the ON position, the module and the steering angle sensor begin to transmit data between each other.
The CAN bus circuit is monitored continuously after the ignition switch is turned to the ON position.
Conditions for Running the DTC
| • | Ignition ON. |
| • | The vehicle speed is greater than 40 km/h (25 mph). |
Conditions for Setting the DTC
Line Interruptions are detected by the CAN message monitor.
Action Taken When the DTC Sets
If equipped, the following actions occur:
| • | The EBCM disables the traction control system (TCS)/vehicle stability enhancement system (VSES) and for the duration of the ignition cycle. |
| • | The Stability indicator illuminates. |
Conditions for Clearing the DTC
| • | 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. |
Diagnostic Aids
The EBCM detects a short to B+, short to ground, or an open/high resistance in the Serial Data HI or Serial Data LO circuit .
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Important: With a DMM, test the Serial Data Bus+ and Serial Data Bus- circuits between the EBCM and the steering angle sensor for being shorted together, shorted to voltage, and shorted to ground.
- With the scan tool perform the special functions Steering Angle Sensor Centering procedure.
- If DTC U1650 resets, test or replace the EBCM.
| ⇒ | If the steering angle sensor procedure is not successful, test or replace the steering angle sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for EBCM replacement, setup, and programming |
