DTC B2439: Headlight LH Circuit; DTC B243A: Headlight RH Circuit [06/2018 - 08/2021]: 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.
FOR LED TYPE TURN SIGNAL LIGHT
| 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 unit assembly malfunction (for TMC Made)
- Headlight assembly malfunction (for TMMK Made)
- Open/short in Lo/Hi beam circuit
Malfunction duration:
- 10 seconds or more
|
- Headlight ECU sub-assembly LH
- Headlight unit assembly LH (for TMC Made)
- Headlight assembly LH (for TMMK Made)
|
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 unit assembly malfunction (for TMC Made)
- Headlight assembly malfunction (for TMMK Made)
- Open/short in Lo/Hi beam circuit
Malfunction duration:
- 10 seconds or more
|
- Headlight ECU sub-assembly RH
- Headlight unit assembly RH (for TMC Made)
- Headlight assembly RH (for TMMK Made)
|
AFS (Sub) |
FOR BULB TYPE TURN SIGNAL LIGHT
| 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 unit assembly malfunction (for TMC Made)
- Headlight assembly malfunction (for TMMK Made)
- Open/short in Lo/Hi beam circuit
Malfunction duration:
- 10 seconds or more
|
- Headlight ECU sub-assembly LH
- Headlight unit assembly LH (for TMC Made)
- Headlight assembly LH (for TMMK Made)
|
HL AutoLeveling |
| B243A |
Headlight RH Circuit |
Detection condition:
- All of the following conditions are met:
- Power switch on (IG)
- Low beam headlights on
Malfunction status:
- Headlight unit assembly malfunction (for TMC Made)
- Headlight assembly malfunction (for TMMK Made)
- Open/short in Lo/Hi beam circuit
Malfunction duration:
- 10 seconds or more
|
- Headlight ECU sub-assembly RH
- Headlight unit assembly RH (for TMC Made)
- Headlight assembly RH (for TMMK Made)
|
HL AutoLeveling (Sub) |