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Communication stop for "Main Body" is indicated on the "Communication Bus Check" screen of the Techstream.
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![2019 - 2020 MY RAV4 HV [02/2019 - 06/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE](/t3Portal/stylegraphics/info.gif)
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Communication stop history for "Main Body" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Main Body" is 6 or more.)
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Communication system DTCs (DTCs that start with U) that correspond to "Main Body ECU Communication Stop Mode" in "DTC Combination Table" are output.
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| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000001H5IC |
| Model Year Start: 2019 | Model: RAV4 HV | Prod Date Range: [02/2019 - ] |
| Title: NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): Main Body ECU Communication Stop Mode; 2019 - 2024 MY RAV4 HV [02/2019 - ] | ||
|
Main Body ECU Communication Stop Mode |
DESCRIPTION
|
Detection Item |
Symptom |
Trouble Area |
|---|---|---|
|
Main Body ECU Communication Stop Mode |
Any of the following conditions are met: |
|
WIRING DIAGRAM
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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- Inspect the fuses for circuits related to this system before performing the following procedure.
- Before measuring the resistance of the CAN bus, turn the ignition 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.
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After turning the ignition 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.
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Some parts must be initialized and set when replacing or removing and installing parts.
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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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HINT:
- Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
- When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
|
1. |
CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] BRANCH WIRE) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
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(b) Disconnect the main body ECU (multiplex network body ECU) connector. |
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(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G44-5 (CANH) - G44-4 (CANL) |
Cable disconnected from negative (-) auxiliary battery terminal |
54 to 69 Ω |
| NG |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR |
|
|
2. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
(a) Remove the main body ECU (multiplex network body ECU).
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(b) Connect the instrument panel junction block assembly connectors.
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(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
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(d) Reconnect the cable to the negative (-) auxiliary battery terminal.
NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected.
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(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
A-31 (BECU) - Body ground |
Ignition switch off |
11 to 14 V |
|
A-30 (ACC) - Body ground |
Ignition switch ACC |
11 to 14 V |
|
Ignition switch off |
Below 1 V |
|
|
A-32 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
|
Ignition switch off |
Below 1 V |
| OK |
|
REPLACE MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU]
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
(a) Disconnect the instrument panel junction block assembly connectors.
|
*a |
Front view of wire harness connector (to Instrument Panel Junction Block Assembly) |
- |
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4D-3 - Body ground |
Always |
Below 1 Ω |
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
4K-1 - Body ground |
Ignition switch off |
11 to 14 V |
|
4D-23 - Body ground |
Ignition switch off |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
(a) Disconnect the instrument panel junction block assembly connector.
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(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| OK |
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REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
| NG |
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GO TO SMART KEY SYSTEM (for Start Function)
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