DTC U0104-87: Lost Communication with Cruise Control Module Missing Message [08/2021 - ]: Procedure
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2024 Lexus ES 350, 2024 Lexus ES 300h, 2024 Lexus ES 250, 2023 Lexus ES 350, and 2023 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK FOR DTCs
- Read each DTC and check the diagnosis pattern using the table below.
Body Electrical > Front Radar Sensor > Trouble Codes
Body Electrical > Pre-Collision System > Trouble Codes
Chassis > Lane Control > Trouble Codes
Body Electrical > Front Recognition Camera (Front Lighting Control) > Trouble Codes
Powertrain > Radar Cruise2 > Trouble Codes
Pattern DTC output part name
(Display on Techstream)Front Radar Sensor Pre-Collision System Lane Control Forward Recognition Camera (Front Lighting Control) Radar Cruise2 Pattern 1 U0104-87 U0235-87 U0235-87 U0235-87 U0235-87 Pattern 2 U0104-87 - - - - Result
Result Proceed to Pattern 1 A Pattern 2 B
Result:
A
GO TO PRE-COLLISION SYSTEM. Refer to DTC U0235-87: Lost Communication with Cruise Control Front Distance Range Sensor Missing Message [08/2021 - ]
Result:
B
See step 2
- Read each DTC and check the diagnosis pattern using the table below.
- CHECK FORWARD RECOGNITION CAMERA
*a Front view of wire harness connector
(to Millimeter Wave Radar Sensor Assembly)- Disconnect the millimeter wave radar sensor assembly connector.
- Using an oscilloscope, check the waveform.
OK
Tester Connection Condition Tool Setting Specified Condition A37-5 (CA1P) - A37-6 (CA1N) Ignition switch ON 1V/DIV., 100μs./DIV. Pulse generation Result
Proceed to OK NG
Result:
OK
REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY. Refer to REMOVAL [08/2021 - ]
Result:
NG
REPLACE FORWARD RECOGNITION CAMERA. Refer to REMOVAL [08/2021 - ]