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Communication stop for "Brake Booster" is indicated on the "Communication Bus Check" screen of the Techstream.
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![2022 - 2025 MY RAV4 HV [12/2021 - ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE](/t3Portal/stylegraphics/info.gif)
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Communication stop history for "Brake Booster" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Brake Booster" is 6 or more.)
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Communication system DTCs (DTCs that start with U) that correspond to "Brake Booster (Skid Control ECU) Communication Stop Mode" in "DTC Combination Table" are output.
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| Last Modified: 05-08-2025 | 6.11:8.1.0 | Doc ID: RM1000000021IS0 |
| Model Year Start: 2022 | Model: RAV4 HV | Prod Date Range: [12/2021 - ] |
| Title: NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): Brake Booster (Skid Control ECU) Communication Stop Mode; 2022 - 2025 MY RAV4 HV [12/2021 - ] | ||
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Brake Booster (Skid Control ECU) Communication Stop Mode |
DESCRIPTION
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Detection Item |
Symptom |
Trouble Area |
|---|---|---|
|
Brake Booster (Skid Control ECU) Communication Stop Mode |
Click here Any of the following conditions are met: |
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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 10 minutes 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
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1. |
CHECK FOR OPEN IN CAN BUS WIRE (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY [NO. 1 SKID CONTROL ECU] BRANCH WIRE) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
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(b) Disconnect the brake booster with master cylinder assembly (No. 1 skid control 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 |
|---|---|---|
|
A104-38 (CA1H) - A104-39 (CA1L) |
Cable disconnected from negative (-) auxiliary battery terminal |
54 to 69 Ω |
|
A104-35 (CA2H) - A104-36 (CA2L) |
Cable disconnected from negative (-) auxiliary battery terminal |
54 to 69 Ω |
| NG |
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REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR |
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2. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
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(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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(b) Reconnect the cable to the negative (-) auxiliary battery terminal.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
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Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
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A104-14 (+BI1) - Body ground |
Ignition switch off |
11 to 14 V |
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A104-15 (BS) - Body ground |
Ignition switch off |
11 to 14 V |
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A104-31 (IG1) - Body ground |
Ignition switch ON |
11 to 14 V |
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Ignition switch off |
Below 1 V |
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A104-42 (IG2) - Body ground |
Ignition switch ON |
11 to 14 V |
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Ignition switch off |
Below 1 V |
| OK |
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REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (NO. 1 SKID CONTROL ECU)
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| NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR |
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