- Forward recognition camera
- Millimeter wave radar sensor assembly
- Blind spot monitor sensor LH*2
- Parking assist ECU*3
- Television camera assembly*1, *3
- Clearance warning ECU assembly*4
- Swing grille actuator assembly*5
- Inner rear view mirror assembly*6
| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000001R236 |
| Model Year Start: 2021 | Model: RAV4 | Prod Date Range: [08/2020 - 12/2021] |
| Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Open in One Side of Bus 1 Branch Line; 2021 MY RAV4 [08/2020 - 12/2021] | ||
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Open in One Side of Bus 1 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.
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Symptom |
Trouble Area |
|---|---|
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*1: w/ Parking Assist Monitor System
*2: w/ Blind Spot Monitor System *3: w/ Panoramic View Monitor System *4: w/ Intuitive Parking Assist System *5: w/ Grille Shutter System *6: w/ Garage Door Opener System (for Digital Inner Mirror Type) |
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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 line is open, or output signals are incomplete. |
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
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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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![2019 - 2024 MY RAV4 [11/2018 - ]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING](/t3Portal/stylegraphics/info.gif)
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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 ignition switch to ON 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.
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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.
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PROCEDURE
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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.
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(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Using the Techstream, perform "CAN Bus Check".
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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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