Toyota Yaris: Pre-collision System / Invalid Data Received from Brake System Control Module Invalid Serial Data Received (U041881)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Pre-collision / Pre-collision System / Invalid Data Received from Brake System Control Module Invalid Serial Data Received (U041881)

DESCRIPTION

The millimeter wave radar sensor assembly receives signals related to the brake control condition from the skid control ECU (brake actuator assembly) via the CAN communication line.

If the millimeter wave radar sensor assembly receives signals from the skid control ECU (brake actuator assembly) indicating a brake control system malfunction, the millimeter wave radar sensor assembly stores DTC U041881.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
U041881	Invalid Data Received from Brake System Control Module Invalid Serial Data Received	When the ignition switch is ON for 3 seconds or more, the millimeter wave radar sensor assembly receives a brake control system malfunction signal from the skid control ECU (brake actuator assembly) for 1 second or more.	Millimeter Wave Radar Sensor Assembly Skid Control ECU (Brake Actuator Assembly)

CAUTION / NOTICE / HINT

NOTICE:

When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle and a DTC may be stored.
When the millimeter wave radar sensor assembly has been replaced with a new one, it is necessary to perform millimeter wave radar sensor assembly beam axis alignment and to clear the vehicle control history. Before performing the Driving Adjustment, make sure to read Before Starting Driving Adjustment.
HINT:

Beam axis alignment of the millimeter wave radar sensor assembly can be performed using either Triangle Target, Flat Surface Target or Driving Adjustment.

Triangle Target: Click here

Flat Surface Target: Click here

Driving Adjustment: Click here

PROCEDURE

1.	CHECK FOR DTCs

(a) Using the GTS, check for vehicle stability control system DTCs.

HINT:

If DTC U041881 is output by the pre-collision system, perform troubleshooting for the vehicle stability control system.

Chassis > Brake > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs are output	B

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

GO TO VEHICLE STABILITY CONTROL SYSTEM

Internal Control Module Software Incompatibility Not Programmed (U030051,U030057)

DESCRIPTION The millimeter wave radar sensor assembly receives vehicle information (Conv/HV/EV) or vehicle information (transmission type) from the ECM via the CAN communication line...

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Other information:

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