Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018WSM
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: U0100,U0125,U0126,U0129,U1104; 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

DTC

U1104

Lost Communication with Driving Support ECU

DESCRIPTION

The ECM and driving support ECU assembly communicates with each sensor and ECU via CAN communication.

If any malfunction is detected in a CAN communication circuit, one or more CAN communication system DTCs are stored.

DTC No.

DTC Detection Condition

Trouble Area

MIL

U0100

While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the ECM and the driving support ECU assembly is detected for approximately 1 second or more.
  • CAN communication system
  • ECM
  • Driving support ECU assembly

Does not come on

U0125

While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the yaw rate and acceleration sensor (airbag sensor assembly) and the driving support ECU assembly is detected for approximately 1 second or more.
  • CAN communication system
  • Yaw rate and acceleration sensor (airbag sensor assembly)
  • Driving support ECU assembly

Does not come on

U0126

While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the steering sensor and the driving support ECU assembly is detected for approximately 1 second or more.
  • CAN communication system
  • Steering sensor (spiral cable with sensor sub-assembly)
  • Driving support ECU assembly

Does not come on

U0129

While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the skid control ECU (brake actuator assembly) and the driving support ECU assembly is detected for approximately 2.5 seconds or more.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Driving support ECU assembly

Does not come on

U1104

While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the driving support ECU assembly and the millimeter wave radar sensor assembly is detected for approximately 0.2 seconds or more.
  • CAN communication system
  • Millimeter wave radar sensor assembly
  • Driving support ECU assembly

Does not come on

PROCEDURE

1.

CHECK FOR DTCs

(a) Clear the DTCs.

Click here 2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: DTC CHECK / CLEAR

(b) Perform the following to make sure that the DTC detection conditions are met.

HINT:

If the following conditions are not met, the system cannot detect the malfunction.

  1. Turn the ignition switch to ON.
  2. Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF button).
  3. Drive the vehicle at 36 km/h (22 mph) or more for 3 seconds or more.

(c) Check for DTCs.

Click here 2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: DTC CHECK / CLEAR

Result

Proceed to

DTC U0100, U0125, U0126, U0129 and U1104 are not output

A

DTC U0100, U0125, U0126, U0129 or U1104 is output

B
A

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM