DTC U0104-87: Lost Communication with Cruise Control Module Missing Message [10/2019 - 08/2021]: Description

WARNING: This page is about a different car, the 2021 Lexus ES 350, 2021 Lexus ES 250, 2020 Lexus ES 350, and 2019 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.

The millimeter wave radar sensor assembly communicates with the forward recognition camera via CAN communication.

If a communication error is detected between the forward recognition camera and millimeter wave radar sensor assembly, the millimeter wave radar sensor assembly stores this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
U0104-87	Lost Communication with Cruise Control Module Missing Message	Detection condition: Engine switch on (IG) Malfunction status: Communication malfunction with the forward recognition camera is detected Malfunction duration: 10 seconds or more	CAN bus line Forward recognition camera Millimeter wave radar sensor assembly Headlight ECU sub-assembly LH	Front Radar Sensor

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

U0104-87

Lost Communication with Cruise Control Module Missing Message

Detection condition:

Engine switch on (IG)

Malfunction status:

Communication malfunction with the forward recognition camera is detected

Malfunction duration:

10 seconds or more

CAN bus line
Forward recognition camera
Millimeter wave radar sensor assembly
Headlight ECU sub-assembly LH

Front Radar Sensor

Pattern	DTC output part name (Display on Techstream)		Suspected Area (Malfunction Status)
	Millimeter Wave Radar Sensor Assembly (Front Radar Sensor)	Forward Recognition Camera (Pre-Collision System)
	U0104-87	U0235-87
Pattern 1	◦	◦	Open in CAN communication line (forward recognition camera - CAN junction connector) Open in CAN communication line (millimeter wave radar sensor assembly - CAN junction connector) CAN junction connector disconnected CAN junction connector Short in CAN communication line Open or short in forward recognition camera internal circuit Open or short in millimeter wave radar sensor assembly internal circuit Short in headlight ECU sub-assembly LH internal circuit
Pattern 2	◦	-	Forward recognition camera connector disconnected Forward recognition camera power supply circuit malfunction Forward recognition camera internal malfunction Millimeter wave radar sensor assembly internal malfunction

◦: DTC is output.-: DTC is not output

HINT:

If the DTCs are output simultaneously, the inspection area can be narrowed down.