DESCRIPTION
A DTC is stored when the headlight ECU sub-assembly receives a light source malfunction signal from its respective headlight unit. The headlight ECU sub-assembly LH stores DTC B2439 or B243A.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Note |
---|---|---|---|---|
B2439 |
Headlamp LH Circuit |
headlight ECU sub-assembly LH light source malfunction |
|
- |
B243A |
Headlamp RH Circuit |
headlight ECU sub-assembly RH light source malfunction |
|
- |
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
PROCEDURE
1. |
CLEAR DTC |
(a) Clear the DTCs.
Click here
|
2. |
CHECK FOR DTC |
(a) Turn the ignition switch to ON.
(b) Operate the light control switch to turn on the low beam headlights.
(c) Check for DTCs.
Click here
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
|
C | ![]() |
GO TO STEP 6 |
|
3. |
REPLACE HEADLIGHT UNIT ASSEMBLY LH |
(a) Replace the headlight unit assembly LH with a new or known good one.
|
4. |
CLEAR DTC |
(a) Clear the DTCs.
Click here
|
5. |
CHECK FOR DTC |
(a) Turn the ignition switch to ON.
(b) Operate the light control switch to turn on the low beam headlights.
(c) Check for DTCs.
Click here
OK:
DTC B2439 is not output.
OK | ![]() |
END (HEADLIGHT UNIT ASSEMBLY LH WAS DEFECTIVE) |
NG | ![]() |
REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH |
6. |
REPLACE HEADLIGHT UNIT ASSEMBLY RH |
(a) Replace the headlight unit assembly RH with a new or known good one.
|
7. |
CLEAR DTC |
(a) Clear the DTCs.
Click here
|
8. |
CHECK FOR DTC |
(a) Turn the ignition switch to ON.
(b) Operate the light control switch to turn on the low beam headlights.
(c) Check for DTCs.
Click here
OK:
DTC B243A is not output.
OK | ![]() |
END (HEADLIGHT UNIT ASSEMBLY RH WAS DEFECTIVE) |
NG | ![]() |
REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH |
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