DTC B242C: Right Headlight ECU Malfunction; DTC B242D: Left Headlight ECU Malfunction [10/2017 - 10/2023]: Procedure

CHECK FOR DTC

Clear the DTCs.
Refer to DTC CHECK / CLEAR [10/2017 - 09/2018] , or refer to DTC CHECK / CLEAR [09/2018 - 10/2020] , or refer to DTC CHECK / CLEAR [10/2020 - 10/2023]

Body Electrical > AFS > Clear DTCs

Body Electrical > AFS (Sub) > Clear DTCs
Turn the power switch on (IG) and wait for at least 10 seconds or more.

Check for DTCs.

Refer to DTC CHECK / CLEAR [10/2017 - 09/2018] , or refer to DTC CHECK / CLEAR [09/2018 - 10/2020] , or refer to DTC CHECK / CLEAR [10/2020 - 10/2023]

Body Electrical > AFS > Trouble Codes

Body Electrical > AFS (Sub) > Trouble Codes

OK

DTC B242C and B242D are not output.

Result

Result	Proceed to
OK	A
NG (DTC B242C is output)	B
NG (DTC B242D is output)	C

Result:

A

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 09/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 09/2019] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2019 - 10/2020] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023]

Result:

B

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to REMOVAL [10/2017 - 10/2020] , or refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2023]

Result:

C

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to REMOVAL [10/2017 - 10/2020] , or refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2023]