Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018YBS
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: PRE-COLLISION: PRE-COLLISION SYSTEM: U0100,U0125,U0126,U0129; Lost Communication with ECM / PCM "A"; 2018 - 2020 MY Sienna [11/2017 -        ]

DTC

U0100

Lost Communication with ECM / PCM "A"

DTC

U0125

Lost Communication with Yaw Rate Sensor Module

DTC

U0126

Lost Communication with Steering Angle Sensor Module

DTC

U0129

Lost Communication with Brake System Control Module

DESCRIPTION

The driving support ECU assembly uses the millimeter wave radar sensor assembly to detect objects in front of the vehicle. Based on signals from the millimeter wave radar sensor assembly, the driving support ECU assembly sends pre-collision system control operation signals. These DTCs are stored when a communication malfunction occurs between ECUs that perform pre-collision system control.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U0100

Lost Communication with ECM / PCM "A"

When the vehicle is being driven at a speed of 5 km/h (4 mph) or more, a communication error between the ECM and the driving support ECU assembly is detected for approximately 5 seconds.

  • CAN communication system
  • ECM
  • Driving support ECU assembly
  • Wire harness or connector

U0125

Lost Communication with Yaw Rate Sensor Module

When the ignition switch is ON, a communication error between the yaw rate sensor (airbag sensor assembly) and the driving support ECU is detected for approximately 1 second.

  • CAN communication system
  • Yaw rate sensor (Airbag sensor assembly)
  • Driving support ECU assembly
  • Wire harness or connector

U0126

Lost Communication with Steering Angle Sensor Module

When the ignition switch is ON, a communication error between the steering sensor and the driving support ECU assembly is detected for approximately 4 seconds.

  • CAN communication system
  • Steering sensor
  • Driving support ECU assembly
  • Wire harness or connector

U0129

Lost Communication with Brake System Control Module

When the ignition switch is ON, a communication error between the skid control ECU (brake actuator assembly) and the driving support ECU assembly is detected for approximately 3 seconds.

  • CAN communication system
  • Skid control ECU (Brake actuator assembly)
  • Driving support ECU assembly
  • Wire harness or connector

PROCEDURE

1.

CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Click here 2018 - 2020 MY Sienna [11/2017 -        ]; PRE-COLLISION: PRE-COLLISION SYSTEM: DTC CHECK / CLEAR

(b) Perform the following procedure.

HINT:

If the following procedure is not performed, the previously output DTC cannot be detected.

  1. Drive the vehicle at a speed of 5 km/h (4 mph) or more for 5 seconds or more.

(c) Check for DTCs.

Click here 2018 - 2020 MY Sienna [11/2017 -        ]; PRE-COLLISION: PRE-COLLISION SYSTEM: DTC CHECK / CLEAR

Result

Proceed to

DTC U0100, U0125, U0126 and U0129 are not output

A

DTC U0100, U0125, U0126 or U0129 is output

B

A

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM