CAN COMMUNICATION SYSTEM, Diagnostic DTC:U0233

DTC Code DTC Name
U0233 Lost Communication with Blind Spot Monitor Master Module

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

U0233

Lost Communication with Blind Spot Monitor Master Module

There is no communication from the blind spot monitor sensor LH.

  • Power source or inside of blind spot monitor sensor LH

  • Blind spot monitor sensor LH CAN branch wire or connector

  • Blind spot monitor sensor LH

Power management control ECU (PM1 Gateway)

For vehicles with a blind spot monitor system.

WIRING DIAGRAM

C250958E22

CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tip:

Operating the engine switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note:

      • After turning the engine switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work.

        Click hereClick here

      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

        Click hereClick hereClick here

    Result

    Proceed to

    NEXT
    NEXT

  2. CHECK FOR OPEN IN CAN BUS WIRE (BLIND SPOT MONITOR SENSOR LH CAN BRANCH WIRE)

    1. C268297C32

      *a

      Front view of wire harness connector

      (to Blind Spot Monitor Sensor LH)

      Disconnect the R44 blind spot monitor sensor LH connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Switch Condition

      Specified Condition

      R44-2 (CA1P) - R44-7 (CA1N)

      Engine switch off

      54 to 69 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE BLIND SPOT MONITOR SENSOR LH CAN BRANCH WIRE OR CONNECTOR (CA1P, CA1N)

    OK

  3. CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR LH - BATTERY AND BODY GROUND)

    1. C268297C33

      *a

      Front view of wire harness connector

      (to Blind Spot Monitor Sensor LH)

      Connect the cable to the negative (-) battery terminal.

      Note:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

      Click hereClick hereClick here

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      R44-10 (BLGD) - Body ground

      Always

      Below 1 Ω

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      R44-5 (BLB) - Body ground

      Engine switch on (IG)

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE BLIND SPOT MONITOR SENSOR LH

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR