Toyota RAV4 (XA40) 2013-2018 Service Manual: Control module communication bus off
Description
Inspection procedure
The skid control ecu inputs the signals from the ecm, steering angle sensor, and yaw rate and acceleration sensor via can communication system.
- Check harness and connector (momentary interruption)
- Using the data list of the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to a dtc (see page bc-23).
Result 
Hint:
Perform the above inspection before removing the sensor and connector.
- Check if each sensor and ecm connector is securely connected
- Check if each sensor or ecm connector is securely connected.
Ok: the connector should be securely connected.
- Reconfirm dtc
- Record the output dtcs (for abs, vsc and can communication) (see page bc-47).
Hint:
If the can communication system dtc and the relevant sensor dtcs are output simultaneously, troubleshoot the relevant sensor dtcs (for abs and vsc) after the can communication system returns to normal.
Result 
Inspect can communication system
- Repair or replace harness and connector
- Repair or replace the harness or connector.
- Check for any momentary interruption between the skid control ecu and each sensor or ecm (see page bc-23).
- Check that there is no momentary interruption.
- Reconfirm dtc
- Clear the dtc (see page bc-47).
- Turn the ignition switch on.
- Drive the vehicle and turn the steering wheel to the right and left at a speed of 15 km/h (9 mph) or more.
- Check that no can communication system dtc is output (see page bc-47).
- If abs and/or vsc dtcs are output, record them.
Result 
Hint:
The can communication system must be normal when repairing the sensor dtcs (for abs and vsc).
Inspect can communication system
Downhill assist control operation switch (test mode dtc)
Description
The downhill assist control switch is connected to the skid control ecu in
the abs and traction
actuator.
Dtc c1379/74 can be detected when the downhill assist control switch se ...
Abs warning light remains on
Description
If any of the following conditions are detected, the abs warning light
remains on:
The ecu connectors are disconnected from the skid control ecu.
There is a malfunction in the ski ...
Other materials:
The rear cross traffic alert function detection areas
The areas that vehicles can be detected in are outlined below.
To give the driver a more consistent time to react, the buzzer can alert
for faster vehicles from farther away.
Example:
The rear cross traffic alert function is operational when
The bsm main switch is set to on.
The shift ...
How to proceed with troubleshooting
Hint:
Use the procedure to troubleshoot the power door lock
control system.
*: Use the intelligent tester.
Vehicle brought to workshop
Inspect battery voltage
Standard voltage:
11 to 14 v
If the voltage is below 11 v, recharge or replace the battery
before proceeding.
...
Front wiper motor
Inspection
Inspect front wiper motor
Check the lo operation.
Connect the battery's positive (+) lead to
terminal 5 (+1) and the negative (-) lead to
terminal 4 (e), and check that the front wiper
motor operates at low speed (lo).
Ok:
front wiper motor operates at low sp ...
