DTC U0104-87: Lost Communication with Cruise Control Module Missing Message [05/2023 - ]: Procedure
WARNING: This page is about a different car, the 2024 Lexus LC 500h. 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 Signal Sensor or Center Missing Message [05/2023 - ]
Result:
B
See step 2
- Read each DTC and check the diagnosis pattern using the table below.
- CHECK FORWARD RECOGNITION CAMERA
- Disconnect the F1 millimeter wave radar sensor assembly connector.
- Using an oscilloscope, check the waveform.
OK
Tester Connection Switch Condition Tool Setting Specified Condition F1-5 (CA1P) - F1-6 (CA1N) power switch on (IG) 1 V/DIV., 100 μs./DIV. Pulse generation Result
Proceed to OK NG
Result:
OK
REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY. Refer to REMOVAL [05/2023 - ]
Result:
NG
REPLACE FORWARD RECOGNITION CAMERA. Refer to REMOVAL [05/2023 - ]