DTC U0104-87: Lost Communication with Cruise Control Module Missing Message [10/2022 - ]: Procedure
WARNING: This page is about a different car, the 2024 Lexus RC 350, 2024 Lexus RC 300, 2023 Lexus RC 350, and 2023 Lexus RC 300. 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 Cruise 2 > 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 Cruise 2 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 [10/2022 - ]
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 B9-5 (CA1P) - B9-6 (CA1N) Engine switch on (IG) 1V/DIV., 100μs./DIV. Pulse generation Result
Proceed to OK NG
Result:
OK
REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY. Refer to REMOVAL [10/2022 - ]
Result:
NG
REPLACE FORWARD RECOGNITION CAMERA. Refer to REMOVAL [10/2022 - ]