CAN COMMUNICATION SYSTEM(w/o Central Gateway ECU), Diagnostic DTC:U0233

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

DESCRIPTION

DTC No. DTC Detection Condition Trouble Area
U0233 No communication from the blind spot monitor sensor LH continues.

  • Blind spot monitor sensor LH branch line or connector

  • Power source circuit of blind spot monitor sensor LH

  • Blind spot monitor sensor LH ground circuit

  • Blind spot monitor sensor LH

Tech Tips

This diagnosis procedure is for when DTC U0233 is output by the power management control ECU (GTS display: PM1 Gateway).

WIRING DIAGRAM

A0009H8E06
A0004IJE05

CAUTION / NOTICE / HINT

Note


  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notice before proceeding with work Click here.

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output Click here.

  • After performing repairs, perform the procedure listed in DTC Reproduction Method and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the power switch on (IG), turn the cruise control main switch on, turn the blind spot monitor main switch on, wait at least 11.84 seconds and then drive the vehicle at a speed of 36 km/h (22 mph) or more for 2 seconds or more.

  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed Click here.

Tech Tips


  • Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. RECONFIRM DTC OUTPUT


    1. Reconfirm DTCs.

      Tech Tips

      If DTC U1002 is output from PM1 Gateway of the power management control ECU, this indicates a sub bus 11 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 11.

      Result
      Result Proceed to

      U1002 is not output from power management control ECU.

      (GTS display: PM1 Gateway)

      		 A

      U1002 is output from power management control ECU.

      (GTS display: PM1 Gateway)

      		 B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

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


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. A0006VME01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Blind Spot Monitor Sensor LH)

      Disconnect the U8 blind spot monitor sensor LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U8-2 (CA1P) - U8-7 (CA1N) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH)

    OK

  3. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. A00085UE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Blind Spot Monitor Sensor LH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U8-10 (BLGD) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


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

    2. A0003RHE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Blind Spot Monitor Sensor LH)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      U8-5 (BLB) - Body ground Power switch on (IG) 11 to 14 V

    OK

    REPLACE BLIND SPOT MONITOR SENSOR LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)