Toyota CH-R Service Manual: Headlamp LH Circuit (B2439,B243A)

Toyota CH-R Service Manual / Lighting (ext) / Lighting System / Headlamp LH Circuit (B2439,B243A)

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	Headlight unit assembly LH Headlight ECU sub-assembly LH	-
B243A	Headlamp RH Circuit	headlight ECU sub-assembly RH light source malfunction	Headlight unit assembly RH Headlight ECU sub-assembly RH	-

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

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > HL AutoLeveling > Clear DTCs

2.	CHECK FOR DTC

(a) Turn the ignition switch to ON.

(b) Operate the light control switch to turn on the low beam headlights.

Click here

Body Electrical > HL AutoLeveling > 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

USE SIMULATION METHOD TO CHECK

GO TO STEP 6

3.	REPLACE HEADLIGHT UNIT ASSEMBLY LH

(a) Replace the headlight unit assembly LH with a new or known good one.

for Halogen Headlight: Click here
for LED Headlight: Click here

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > HL AutoLeveling > Clear DTCs

5.	CHECK FOR DTC

(a) Turn the ignition switch to ON.

(b) Operate the light control switch to turn on the low beam headlights.

Click here

Body Electrical > HL AutoLeveling > Trouble Codes

OK:

DTC B2439 is not output.

END (HEADLIGHT UNIT ASSEMBLY LH WAS DEFECTIVE)

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.

for Halogen Headlight: Click here
for LED Headlight: Click here

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > HL AutoLeveling > Clear DTCs

8.	CHECK FOR DTC

(a) Turn the ignition switch to ON.

(b) Operate the light control switch to turn on the low beam headlights.

Click here

Body Electrical > HL AutoLeveling > Trouble Codes

OK:

DTC B243A is not output.

END (HEADLIGHT UNIT ASSEMBLY RH WAS DEFECTIVE)

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

Lost Communication With Headlamp Control Module "B" (U0242)

DESCRIPTION The headlight ECU sub-assembly LH stores this DTC when the headlight ECU sub-assembly RH detects an internal malfunction or if a communication malfunction occurs between headlight ECU ...

Right Headlight ECU Malfunction (B242C,B242D)

DESCRIPTION These DTCs are stored if the headlight ECU sub-assembly LH or RH detects an internal malfunction. The headlight ECU sub-assembly LH stores DTC B242C or B242D. DTC No. ...

Other materials:

Toyota CH-R Service Manual > Audio And Visual System(for Radio And Display Type): Certification ECU Vehicle Information Reading/Writing Process Malfunction (B15F7)
DESCRIPTION This DTC is stored when items controlled by the certification ECU (smart key ECU assembly) cannot be customized via the audio and visual system vehicle customization screen. HINT: The certification ECU (smart key ECU assembly) controls the smart key system related items that are ...

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Toyota CH-R Service Manual: Headlamp LH Circuit (B2439,B243A)

Lost Communication With Headlamp Control Module "B" (U0242)

Right Headlight ECU Malfunction (B242C,B242D)

Other materials:

Toyota CH-R Owners Manual

Toyota CH-R Service Manual