CAN COMMUNICATION SYSTEM(for LHD) Blind Spot Monitor Sensor Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Blind Spot Monitor Sensor Communication Stop Mode

Either condition is met:


  • Communication stop for "Blind Spot Monitor Master" is indicated on the "Communication Bus Check" screen of the GTS.

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  • Communication system DTCs (DTCs that start with U) that are output correspond to "Blind Spot Monitor Sensor Communication Stop Mode" in "DTC Combination Table".

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  • Power source circuit of blind spot monitor sensor RH

  • Blind spot monitor sensor RH ground circuit

  • Blind spot monitor sensor RH CAN branch wire or connector

  • Blind spot monitor sensor RH

WIRING DIAGRAM

B002CE3E03
*a No. 13 Junction Connector
*b from RR-IG1 RLY1 Relay
*c BRGD
*d Blind Spot Monitor Sensor RH

CAUTION / NOTICE / HINT

Note


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

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

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  • 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.

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  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the engine switch on (IG), and turn the blind spot monitor main switch on, and then wait 11.6 seconds or more.

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

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

Tech Tips


  • Operating the engine 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. CHECK FOR OPEN IN CAN BUS WIRE (BLIND SPOT MONITOR SENSOR RH BRANCH WIRE)


    1. B002DG7C12
      *a

      Front view of wire harness connector

      (to Blind Spot Monitor Sensor RH)

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

    2. Disconnect the blind spot monitor sensor RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T31-2 (CA1P) - T31-7 (CA1N) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH)

    OK

  2. CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR RH - BATTERY AND BODY GROUND)


    1. B002DG7C11
      *a

      Front view of wire harness connector

      (to Blind Spot Monitor Sensor RH)

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

      Note

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      T31-5 (BRB) - Body ground Engine switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T31-10 (BRGD) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BLIND SPOT MONITOR SENSOR RH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR