DTC C1A03: Driving Support ECU Internal Logical Error [11/2017 - 01/2023]: Procedure

1. Clear the DTCs.

   Powertrain > Radar Cruise > Clear DTCs 

2. Perform the following to make sure that the DTC detection conditions are met.

   HINT: 

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

   1. Turn the engine switch on (IG).
   2. Wait for 1 second or more.
3. Check for DTCs.

   Powertrain > Radar Cruise > Trouble Codes 

   Result

   Result	Proceed to
   DTC C1A03 is not output	A
   DTC C1A03 is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 03/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2019 - 09/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2020 - 01/2023] 

Result: 

B 

REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to  COMPONENTS [09/2014 - 01/2023]