Circuit/System Verification
IMPORTANT:
With a DMM, test the following circuits for possible malfunction:
- GM LAN Bus+ CAN HI and GM LAN Bus- CAN LO circuits between the EBCM and the steering angle sensor for an open.
- Steering angle sensor ground circuit for an open.
- Steering angle sensor ignition circuit for an open.
- With the scan tool perform the Steering Angle Sensor Centering procedure in EBCM VSES scan tool special functions.
- If the steering angle sensor procedure is not successful, test or replace the steering angle sensor.
- Test drive the vehicle refer to Diagnostic Test Drive .
- If DTC U1651 resets, test or replace the EBCM.