2018 Toyota Rav 4 Adas Can Communication Faults

Stephen Owner/Technician Orange, Texas Posted   Latest   Edited  
Question
Network Communications
2018 Toyota RAV4 Limited 2.5L (2AR-FE) 6-spd (U760E)—JTMYFREV3JJ723976
U0126 - Lost Communication With Steering Angle Sensor Module

Autologic Drive-pro was used to pull the following codes. 

BSM current f/code U0126 loss of communication with steering angle sensor set in the BSM main and slave monitor sensors. 

Pre-collision 2 history codes: u0125 lost communication with yaw rate sensor, u0126 lost communication with steering angle sensor, and u0129 lost communication with brake control system. 

Using Toyota tech stream lite we found the same codes. When a can system check was performed we see the front distance range sensor off-line. Checked the radar sensor can wiring and found it to be open. Found a break in the CA2L side. We will be replacing the radar sensor wiring harness.

My question is why no f/code U0235 loss of communication with range sensor is set in the Pre-collision 2 module ?

Next question is why the BSM sets the U0126 code but no data can be viewed and is it possible the loss of can communication with range sensor is affecting flow of info to BSM ?

Also why can't we clear the Pre-collision history codes ?

0
JJ Technician
Quincy, Massachusetts
JJ Default
 

Can you temporarily repair the CA2L wire to get comm back with the radar sensor and see how that affects the rest of the system?

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Stephen Owner/Technician
Orange, Texas
Stephen Default
 

Will be replacing the distance sensor harness tomorrow morning. Will report our findings.

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Tony Owner/Technician
Moncks Corner, South Carolina
Tony Default
 

The distance sensor is tied into the brake control system (EAB). If you tried to perform the front beam axis adjustment, it might have shown an error code 11 "CAN communication between DSS and the millimeter wave radar sensor assembly is abnormal." w/ Pre-collision System: When the front bumper is damaged or deformed due to an accident or contact with other objects, etc., or the bumper…

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Helpful
Stephen Owner/Technician
Orange, Texas
Stephen Default
 

Thank you for the explanation, it is much appreciated.

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Stephen Owner/Technician
Orange, Texas
Stephen Default
 

Replaced the distance sensor harness and all can communication resumed. All codes cleared and calibration was successful. Thanks again for the info.

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Scott Manager
Claremont, California
Scott Default
 

Hi Stephen, Can you reply to original post with this info? This will also allow you to close out your post as resolved.

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Stephen Owner/Technician
Orange, Texas
Stephen Resolution
 

Replaced the distance sensor harness ans all can communication resumed. All codes cleared and calibration was successful.

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