Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM10000000152IH
Model Year Start: 2018 Model: Camry HV Prod Date Range: [07/2017 -           ]
Title: LIGHTING (EXT): LIGHTING SYSTEM (w/ AFS): B2439,B243A; Headlight LH Circuit; 2018 - 2024 MY Camry HV [07/2017 -        ]

DTC

B2439

Headlight LH Circuit

DTC

B243A

Headlight RH Circuit

DESCRIPTION

The headlight ECU sub-assembly LH and headlight ECU sub-assembly RH internally boost the power supply voltage to ensure a constant supplied current for the lo/hi beam LED of their respective headlight.

By monitoring the LED power supply voltage, abnormal current and malfunctions can be detected.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B2439

Headlight LH Circuit

Detection condition:

  • All of the following conditions are met:
    • Power switch on (IG)
    • Low beam headlights on

Malfunction status:

  • Headlight assembly malfunction
  • Open/short in Lo/Hi beam circuit

Malfunction duration:

  • 10 seconds or more
  • Headlight ECU sub-assembly LH
  • Headlight assembly LH

AFS

B243A

Headlight RH Circuit

Detection condition:

  • All of the following conditions are met:
    • Power switch on (IG)
    • Low beam headlights on

Malfunction status:

  • Headlight assembly malfunction
  • Open/short in Lo/Hi beam circuit

Malfunction duration:

  • 10 seconds or more
  • Headlight ECU sub-assembly RH
  • Headlight assembly RH

AFS (Sub)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

    Click here 2018 - 2020 MY Camry HV [07/2017 - 10/2020]; LIGHTING (EXT): LIGHTING SYSTEM (w/ AFS): INITIALIZATION 2021 - 2024 MY Camry HV [10/2020 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (w/ AFS): INITIALIZATION

  • If the headlight assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

    Click here 2018 - 2020 MY Camry HV [07/2017 - 10/2020]; LIGHTING (EXT): LIGHTING SYSTEM (w/ AFS): INITIALIZATION 2021 - 2024 MY Camry HV [10/2020 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (w/ AFS): INITIALIZATION

PROCEDURE

1.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / AFS or AFS (Sub) / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > AFS > Clear DTCs

Body Electrical > AFS (Sub) > Clear DTCs

NEXT

2.

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Operate the light control switch to turn on the low beam headlights and wait 10 seconds or more.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / AFS or AFS (Sub) / Trouble Codes.

(f) Check for DTCs.

Body Electrical > AFS > Trouble Codes

Body Electrical > AFS (Sub) > Trouble Codes

OK:

DTC B2439 and B243A are not output.

Result

Proceed to

OK

A

NG (DTC B2439 is output)

B

NG (DTC B243A is output)

C
A

USE SIMULATION METHOD TO CHECK 2018 MY Camry HV [07/2017 - 09/2018]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2019 MY Camry HV [09/2018 - 09/2019]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2020 MY Camry HV [09/2019 - 10/2020]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2021 MY Camry HV [10/2020 - 08/2021]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2022 - 2024 MY Camry HV [08/2021 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

C

GO TO STEP 6

B

3.

CHECK HEADLIGHT ASSEMBLY LH

(a) Remove each headlight ECU sub-assembly, interchange the headlight assembly LH with RH and connect the connectors.

Click here 2018 - 2020 MY Camry HV [07/2017 - 10/2020]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL 2021 - 2024 MY Camry HV [10/2020 -        ]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL

NEXT

4.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / AFS or AFS (Sub) / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > AFS > Clear DTCs

Body Electrical > AFS (Sub) > Clear DTCs

NEXT

5.

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Operate the light control switch to turn on the low beam headlights and wait 10 seconds or more.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / AFS or AFS (Sub) / Trouble Codes.

(f) Check for DTCs.

Body Electrical > AFS > Trouble Codes

Body Electrical > AFS (Sub) > Trouble Codes

Result

Proceed to

DTC B2439 is output

A

DTC B243A is output

B
A

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH 2018 - 2020 MY Camry HV [07/2017 - 10/2020]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL 2021 - 2024 MY Camry HV [10/2020 -        ]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL

B

REPLACE HEADLIGHT ASSEMBLY LH 2018 - 2020 MY Camry HV [07/2017 - 10/2020]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL 2021 - 2024 MY Camry HV [10/2020 -        ]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL

6.

CHECK HEADLIGHT ASSEMBLY RH

(a) Remove each headlight ECU sub-assembly, interchange the headlight assembly RH with LH and connect the connectors.

Click here 2018 - 2020 MY Camry HV [07/2017 - 10/2020]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL 2021 - 2024 MY Camry HV [10/2020 -        ]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL

NEXT

7.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / AFS or AFS (Sub) / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > AFS > Clear DTCs

Body Electrical > AFS (Sub) > Clear DTCs

NEXT

8.

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Operate the light control switch to turn on the low beam headlights and wait 10 seconds or more.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / AFS or AFS (Sub) / Trouble Codes.

(f) Check for DTCs.

Body Electrical > AFS > Trouble Codes

Body Electrical > AFS (Sub) > Trouble Codes

Result

Proceed to

DTC B243A is output

A

DTC B2439 is output

B
A

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH 2018 - 2020 MY Camry HV [07/2017 - 10/2020]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL 2021 - 2024 MY Camry HV [10/2020 -        ]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL

B

REPLACE HEADLIGHT ASSEMBLY RH 2018 - 2020 MY Camry HV [07/2017 - 10/2020]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL 2021 - 2024 MY Camry HV [10/2020 -        ]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL