DTC C164B: Communication Error From Clearance Sonar ECU to VSC [11/2018 - ]: Procedure

1. Using the Techstream, check for DTCs according to the prompts on the screen.

   HINT: 

   After turning the power switch from off to on (IG), wait 4 seconds or more before checking for DTCs.

   Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes 

2. Clear the DTCs according to the screen on the Techstream.

   Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Clear DTCs 

3. Recheck for DTCs.

   Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes 

   HINT: 

   • If DTC C164B is not output after clearing the DTCs, an intermittent communication error between the clearance warning ECU assembly and skid control ECU is suspected.
   • If DTC C164B is output frequently, duplicate the conditions that cause the problem symptoms and perform troubleshooting again, even though the DTC was not output when rechecking for DTCs.

     Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ]

   Result

   Result	Proceed to
   DTC C164B is output	A
   DTC C164B is not output	B

Result: 

B 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

Result: 

A 

See step  2

1. Using the Techstream, check for DTCs according to the prompts on the screen.

   Chassis > ABS/VSC/TRAC > Trouble Codes 

   Result

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

Result: 

B 

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2015 - ] 

Result: 

A 

See step  3

1. Replace the clearance warning ECU assembly with a known good one.

   Refer to REMOVAL [11/2018 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

1. Using the Techstream, check for DTCs according to the prompts on the screen.

   Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes 

2. Clear the DTCs according to the screen on the Techstream.

   Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Clear DTCs 

3. Recheck for DTCs.

   Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes 

   Result

   Result	Proceed to
   DTC C164B is output	A
   DTC C164B is not output	B

Result: 

A 

REPLACE BRAKE BOOSTER WITH MASTER CYRINDER ASSEMBLY (SKID CONTROL ECU). Refer to  REMOVAL [11/2018 - ] 

Result: 

B 

END (CLEARANCE WARNING ECU ASSEMBLY DEFECTIVE)