Toyota CH-R Service Manual: 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

1.

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > HL AutoLeveling > Clear DTCs

NEXT

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

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

A

USE SIMULATION METHOD TO CHECK

C

GO TO STEP 6

B

3.	REPLACE HEADLIGHT UNIT ASSEMBLY LH

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

NEXT

4.

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > HL AutoLeveling > Clear DTCs

NEXT

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

Body Electrical > HL AutoLeveling > Trouble Codes

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.

NEXT

7.

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > HL AutoLeveling > Clear DTCs

NEXT

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

Body Electrical > HL AutoLeveling > Trouble Codes

OK:

DTC B243A is not output.

OK

END (HEADLIGHT UNIT ASSEMBLY RH WAS DEFECTIVE)

NG

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH