DTC C1A01: Driving Support ECU [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. Turn the dynamic radar cruise control system on using the cruise control main switch (ON/OFF button).
   3. Wait for 1 second or more.
3. Check for DTCs.

   Powertrain > Radar Cruise > Trouble Codes 

   Result

   Result	Proceed to
   DTC C1A01 is not output	A
   DTC C1A01 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]