DTC U0104-87: Lost Communication with Cruise Control Module Missing Message [11/2018 - 12/2021]: Procedure

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

   Front Radar Sensor: Refer to DTC CHECK / CLEAR [11/2018 - 12/2021]

   Pre-Collision System: Refer to DTC CHECK / CLEAR [11/2018 - 12/2021]

   Body Electrical > Front Radar Sensor > Trouble Codes 

   Body Electrical > Pre-Collision System > Trouble Codes 

   Pattern	Display on Techstream / Output DTC
   	Millimeter Wave Radar Sensor Assembly (Front Radar Sensor)	Forward Recognition Camera (Pre-Collision System)
   Pattern 1	U0104-87	U0235-87
   Pattern 2	U0104-87	-

   Result

   Result	Proceed to
   Pattern 1	A
   Pattern 2	B

Result: 

B 

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY. Refer to  REMOVAL [11/2018 - 12/2021] 

Result: 

A 

See step  2

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the B9 millimeter wave radar sensor assembly connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B9-5 (CA1P) - B9-6 (CA1N)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω
   B9-5 (CA1P) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
   B9-6 (CA1N) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
   B9-5 (CA1P) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
   B9-6 (CA1N) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  4

Result: 

OK 

See step  3

1. Replace the millimeter wave radar sensor assembly.

   Refer to REMOVAL [11/2018 - 12/2021]

2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [11/2018 - 12/2021]

   Body Electrical > Front Radar Sensor > Clear DTCs 

3. Make sure that the DTC detection conditions are met.

   HINT: 

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

4. Recheck for DTCs and check that no DTCs are output.

   Refer to DTC CHECK / CLEAR [11/2018 - 12/2021]

   Body Electrical > Front Radar Sensor > Trouble Codes 

   OK

   DTC U0104-87 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE) 

Result: 

NG 

REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [11/2018 - 12/2021] 

1. Reconnect the B9 millimeter wave radar sensor assembly connector.
2. Disconnect the P8 forward recognition camera connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P8-6 (CANH) - P8-12 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω
   P8-6 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
   P8-12 (CANL) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
   P8-6 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
   P8-12 (CANL) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR 

Result: 

OK 

See step  5

1. Replace the millimeter wave radar sensor assembly.

   Refer to REMOVAL [11/2018 - 12/2021]

2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [11/2018 - 12/2021]

   Body Electrical > Front Radar Sensor > Clear DTCs 

3. Make sure that the DTC detection conditions are met.

   HINT: 

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

4. Recheck for DTCs and check that no DTCs are output.

   Refer to DTC CHECK / CLEAR [11/2018 - 12/2021]

   Body Electrical > Front Radar Sensor > Trouble Codes 

   OK

   DTC U0104-87 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE) 

Result: 

NG 

REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [11/2018 - 12/2021]