Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001AULN |
Model Year Start: 2019 |
Model: GR Corolla |
Prod Date Range: [06/2018 - 09/2022] |
Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): B2439,B243A; Headlight LH Circuit; 2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022] |
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:
-
Engine switch on (IG)
-
Low beam headlights on
Malfunction status:
-
Headlight unit assembly malfunction
-
Open/short in Lo/Hi beam circuit
|
-
Headlight ECU sub-assembly LH
-
Headlight unit assembly LH
|
AFS
|
B243A
|
Headlight RH Circuit
|
Detection condition:
-
All of the following conditions are met:
-
Engine switch on (IG)
-
Low beam headlights on
Malfunction status:
-
Headlight unit assembly malfunction
-
Open/short in Lo/Hi beam circuit
|
-
Headlight ECU sub-assembly RH
-
Headlight unit 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
-
When replacing the headlight ECU sub-assembly LH, always replace it with a new one. If a headlight ECU sub-assembly LH which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
PROCEDURE
(a) Connect the Techstream to the DLC3.
(b) Turn the engine 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
|
|
|
(a) Connect the Techstream to the DLC3.
(b) Turn the engine 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
|
B
|
|
|
3.
|
CHECK HEADLIGHT UNIT ASSEMBLY LH
|
(a) Interchange the headlight unit assembly LH with RH and connect the connectors.
Click here
NEXT
|
|
|
(a) Connect the Techstream to the DLC3.
(b) Turn the engine 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
|
|
|
(a) Connect the Techstream to the DLC3.
(b) Turn the engine 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
|
6.
|
CHECK HEADLIGHT UNIT ASSEMBLY RH
|
(a) Interchange the headlight unit assembly RH with LH and connect the connectors.
Click here
NEXT
|
|
|
(a) Connect the Techstream to the DLC3.
(b) Turn the engine 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
|
|
|
(a) Connect the Techstream to the DLC3.
(b) Turn the engine 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
|
|