DTC U023A: Lost Communication with Front Camera Module [08/2016 - ]: Procedure

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [08/2016 - ]

   Chassis > PCS/LDA/RSA/LVN > Trouble Codes 

   Result

   Result	Proceed to
   DTC U023A and other DTCs are output	A
   Only DTC U023A is output	B

Result: 

A 

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2016 - ] 

Result: 

B 

See step  2

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [08/2016 - ]

   Chassis > ABS/VSC/TRAC > Trouble Codes 

   Result

   Result	Proceed to
   Vehicle stability control system DTC are not output	A
   Vehicle stability control system DTC are output	B

Result: 

B 

GO TO VEHICLE STABILITY CONTROL SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - ] 

Result: 

A 

See step  3

HINT: 

When entering test mode, the skid control ECU (brake actuator assembly) communicates with the driving support ECU assembly to judge whether the vehicle is equipped with the pre-collision system. Therefore, do not exit test mode within 5 seconds of entering test mode.

1. Procedure to enter Test Mode (signal check).
   1. Turn the ignition switch off.
   2. Apply the parking brake.
   3. Check that the steering wheel is centered.
   4. Check that the shift lever is in neutral (for manual transaxle).
   5. Check that the shift lever is in P (for continuously variable transaxle).
   6. Connect the Techstream to the DLC3.
   7. Turn the ignition switch to ON and turn the Techstream on.
   8. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Signal Check.

      Chassis > ABS/VSC/TRAC > Utility 

      Tester Display
      Signal Check

      HINT: 

      Do not exit test mode within 5 seconds of entering test mode. If test mode is exited within 5 seconds of entering test mode, DTC U023A may be stored. If DTC U023A is output after exiting test mode, enter test mode again, wait at least 5 seconds, then recheck for DTCs.

   9. Check that the ABS warning and slip indicator lights come on for several seconds and then blink in the Test Mode pattern.

      HINT: 

      If the ABS warning and slip indicator lights do not blink, inspect the ABS warning and slip indicator light circuits.

2. End of Test Mode (Signal Check)
   1. End Test Mode (signal check) using the Techstream
      1. Turn the ignition switch off and enter normal mode.
      2. Remove the Techstream.

NEXT 

See step  4

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [08/2016 - ]

   Chassis > PCS/LDA/RSA/LVN > Clear DTCs 

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

   HINT: 

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

3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [08/2016 - ]

   Chassis > PCS/LDA/RSA/LVN > Trouble Codes 

   Result

   Result	Proceed to
   DTC U023A is not output	A
   DTC U023A is output	B

Result: 

A 

END 

Result: 

B 

See step  5

1. Replace the pre-collision city sensor.

   Refer to REMOVAL [08/2016 - ]

2. Perform Pre-collision City Sensor Optical Axis Learning.

   Refer to ADJUSTMENT [08/2016 - ]

NEXT 

See step  6

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [08/2016 - ]

   Chassis > PCS/LDA/RSA/LVN > Clear DTCs 

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

   HINT: 

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

3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [08/2016 - ]

   Chassis > PCS/LDA/RSA/LVN > Trouble Codes 

   Result

   Result	Proceed to
   DTC U023A is not output	A
   DTC U023A is output	B

Result: 

A 

END (PRE-COLLISION CITY SENSOR WAS DEFECTIVE) 

Result: 

B 

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [08/2016 - ]