Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001FYHO
Model Year Start: 2019 Model: RAV4 HV Prod Date Range: [11/2018 - 02/2019]
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): Open in One Side of Bus 5 Branch Line; 2019 MY RAV4 HV [11/2018 - 02/2019]

Open in One Side of Bus 5 Branch Line

DESCRIPTION

When the CAN bus main lines are normal (no open, short to ground, short to +B or short between lines) and there is an ECU or sensor on the "Communication Bus Check" screen that is indicated as not communicating or whose connection status on the "Communication Bus Check" screen changes intermittently, an open in one of the wires of a CAN bus branch line is suspected.

HINT:

If there is an ECU or sensor whose connection status changes intermittently while checking the "Communication Bus Check" screen, there may be an open circuit in one of the wires of a branch line of an ECU or sensor in the bus. If an open occurs in one of the wires of a CAN branch line, it may interfere with the communication of other ECUs or sensors resulting in an incorrect state being displayed.

Symptom

Trouble Area
*: w/ Power Back Door System

There is an ECU or sensor that is indicated as not communicating on the "Communication Bus Check" screen or whose connection status on the "Communication Bus Check" screen changes intermittently.

One side of CAN branch wire is open, or output signals are incomplete.

  • Headlight ECU sub-assembly LH
  • Headlight ECU sub-assembly RH
  • Position control ECU assembly
  • Main body ECU (multiplex network body ECU)
  • Certification ECU (smart key ECU assembly)
  • Air conditioning amplifier assembly
  • Multiplex network door ECU*

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

NOTICE:

  • 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 2019 MY RAV4 HV [11/2018 - 02/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

  • 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) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes 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 as normal.

    Click here 2019 MY RAV4 HV [11/2018 - 02/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM

  • Some parts must be initialized and set when replacing or removing and installing parts.

    Click here 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

PROCEDURE

1.

CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE

(a) Based on the vehicle equipment and specifications, confirm the systems that use CAN communication.

Click here 2019 MY RAV4 HV [11/2018 - 02/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG).

(d) Turn the Techstream on.

(e) Using the Techstream, perform "CAN Bus Check".

Click here 2019 MY RAV4 HV [11/2018 - 02/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM

CAN Bus Check

(f) Observe the screen for approximately 2 minutes to check for ECUs and sensors that are displayed as not communicating.

(g) Perform the inspection as specified in the Problem Symptoms Table for the ECUs or sensors that are not communicating.

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