Click here

CAN COMMUNICATION SYSTEM(w/ Central Gateway ECU) Driving Support ECU Communication Stop Mode

Click here
Click here
DTC Code DTC Name
  Driving Support ECU Communication Stop Mode
Click here

DESCRIPTION

Detection Item Symptom Trouble Area
Driving Support ECU Communication Stop Mode

Either condition is met:


  • "Driving Support (Cruise Control-ACC)" is not displayed on the CAN Bus Check screen of the GTS (Click here).

  • Communication system DTCs (DTCs that start with U) that correspond to "Driving Support ECU Communication Stop Mode" in "DTC Combination Table" are output (Click here).

  • Driving support ECU assembly branch line or connector

  • Power source circuit of driving support ECU assembly

  • Driving support ECU assembly ground circuit

  • Driving support ECU assembly
Click here

WIRING DIAGRAM

Click here

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 or any 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 notices 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 DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the power switch on (IG), turn the LDA main switch on, wait at least 10 seconds and then drive the vehicle at a speed of 36 km/h (22 mph) or more for 6.04 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 (Click here).

Tip:

  • 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.

Click here

PROCEDURE


  1. Click here

    CHECK OPEN IN CAN BUS LINES (DRIVING SUPPORT ECU ASSEMBLY BRANCH LINE)


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

    2. A0006AVE02

      Disconnect the H196 driving support ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Value
      H196-10 (CA2H) - H196-11 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to Driving Support ECU Assembly)

    • OKClick here
    • NG

      REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY)

  2. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A0004CIE02

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

      Standard Resistance
      Tester Connection Condition Specified Value
      H196-28 (GND) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      Table 2. Text in Illustration
      *a

      Front view of wire harness connector

      (to Driving Support ECU Assembly)

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

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

      Standard Voltage
      Tester Connection Condition Specified Value
      H196-7 (B) - Body ground Power switch on (IG) 11 to 14 V

    • OK

      REPLACE DRIVING SUPPORT ECU ASSEMBLY (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)