Circuit/System Verification
WARNING: This page is about a different car, the 2015 Buick LaCrosse. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON.
- Verify the scan tool can communicate with the B218L Side Object Sensor Module - Left.
- If the scan tool cannot communicate with the B218R Side Object Sensor Module - Right
Refer to Circuit/System Testing - Left Side Object Sensor Malfunction .
- If the scan tool can communicate with the B218L Side Object Sensor Module - Left
- If the scan tool cannot communicate with the B218R Side Object Sensor Module - Right
- Verify DTC U18A6 is not present
- If DTC U18A6 is present
Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If DTC U18A6 is not present
- If DTC U18A6 is present
- Ignition OFF, ignition ON.
- Verify that both side blind zone alert system indicators located in the outside rearview mirrors briefly turn ON and then turn OFF during the system self test.
- If both side blind zone alert indicators do not briefly turn ON and OFF
- Verify the system is enabled
- If disabled, refer to Diagnostic Aids for cause of disable.
- If enabled, refer to Circuit/System Testing - Side Object Indicator Malfunction .
- If only one indicator does not briefly illuminate during the self test
Refer to Circuit/System Testing - Side Object Indicator Malfunction .
- If both side blind zone alert indicators briefly turn ON and OFF
- All OK.