DTC U0104-87: Lost Communication with Cruise Control Module Missing Message [02/2024 - ]: Procedure

1. Read each DTC and check the diagnosis pattern using the table below.

   Body Electrical > Front Radar Sensor > Trouble Codes 

   Chassis > Front Recognition Camera > Trouble Codes 

   Pattern	DTC output part name (Display on GTS)
   	Front Radar Sensor	Front Recognition Camera
   Pattern 1	U0104-87	U0235-87
   Pattern 2	U0104-87	-

   Result

   Result	Proceed to
   Pattern 1	A
   Pattern 2	B

Result: 

A 

GO TO FRONT CAMERA SYSTEM 

Refer to DTC U0235-87: Lost Communication with Cruise Control Front Distance Range Sensor Single Sensor or Center Missing Message [02/2024 - ]

Result: 

B 

See step  2

1. Check that the connectors are properly connected to the forward recognition camera and millimeter wave radar sensor assembly.

   OK

   The connectors are properly connected

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT CONNECTORS PROPERLY 

Result: 

OK 

See step  3

1. Read each DTC and check the diagnosis pattern using the table below.

   Body Electrical > Front Radar Sensor > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

Pre-procedure1

1. Turn the ignition switch off.
2. Turn the ignition switch to ON.
3. Make sure that the DTC detection conditions are met.

   HINT: 

   If the detection conditions are not met, the system cannot detect the malfunction.

   Procedure1

4. Check for DTCs.

   Body Electrical > Front Radar Sensor > Trouble Codes 

   Result

   Result	Proceed to
   U0104-87 is not output	A
   U0104-87 is output	B

   Post-procedure1

5. None

Result: 

A 

END 

Result: 

B 

See step  5

Pre-procedure1

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the B7 millimeter wave radar sensor assembly connector.

   Procedure1

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B7-8 (CA1P) - B7-7 (CA1N)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. None

Result: 

NG 

REPAIR OR REPLACE CAN BUS HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

Pre-procedure1

1. Disconnect the B7 millimeter wave radar sensor assembly connector.

   Procedure1

2. Using an oscilloscope, check the waveform.

   OK

   Tester Connection	Condition	Tool Setting	Specified Condition
   B7-8 (CA1P) - B7-7 (CA1N)	Ignition switch ON	1V/DIV., 100μs./DIV.	Pulse generation

   Result

   Proceed to
   OK
   NG

   Post-procedure1

3. None

Result: 

OK 

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY 

Refer to REMOVAL [02/2024 - ]

Result: 

NG 

REPLACE FORWARD RECOGNITION CAMERA 

Refer to REMOVAL [02/2024 - ]