Toyota Corolla Cross: Low Beam LH Circuit Voltage Out of Range (B24441C,B24451C)

DESCRIPTION

The BIN resistance is equipped for the purpose of correcting variances in brightness (luminous flux) when the headlight ECU sub-assembly is energizing the LED with a constant current to illuminate it.

Also, it monitors the voltage applied to the BIN resistance in order to detect abnormalities in the energizing current and thereby detect malfunctions.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B24441C	Low Beam LH Circuit Voltage Out of Range	Detection condition: Ignition switch is to ON, low beam headlights illuminated Malfunction status: Headlight LED LH (BIN resistance) malfunction Open/short in headlight LED LH (BIN resistance) circuit Malfunction duration: 10 seconds or more	Headlight unit assembly LH Headlight ECU sub-assembly LH
B24451C	Low Beam RH Circuit Voltage Out of Range	Detection condition: Ignition switch is to ON, low beam headlights illuminated Malfunction status: Headlight LED RH (BIN resistance) malfunction Open/short in headlight LED RH (BIN resistance) circuit Malfunction duration: 10 seconds or more	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.

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PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Headlight Control > Clear DTCs Body Electrical > Headlight Control (Sub) > Clear DTCs

NEXT

2.	CHECK FOR DTC

(a) Turn the ignition switch to ON.

(b) Check for DTCs.

Body Electrical > Headlight Control > Trouble Codes Body Electrical > Headlight Control (Sub) > Trouble Codes

OK:

DTC B24441C and B24451C are not output.

Result	Proceed to
DTCs are not output	A
B24441C is output	B
B24451C is output	C

A

USE SIMULATION METHOD TO CHECK

C

GO TO STEP 6

B

3.	CHECK HEADLIGHT UNIT ASSEMBLY LH

(a) Interchange the headlight unit assembly LH with RH and connect the connectors.

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NEXT

4.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Headlight Control > Clear DTCs Body Electrical > Headlight Control (Sub) > 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 and wait 10 seconds or more.

(c) Check for DTCs.

Body Electrical > Headlight Control > Trouble Codes Body Electrical > Headlight Control (Sub) > Trouble Codes

Result	Proceed to
B24441C is output	A
B24451C is output	B

A

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

B

REPLACE HEADLIGHT UNIT ASSEMBLY LH

6.	CHECK HEADLIGHT UNIT ASSEMBLY RH

(a) Interchange the headlight unit assembly RH with LH and connect the connectors.

Click here

NEXT

7.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Headlight Control > Clear DTCs Body Electrical > Headlight Control (Sub) > 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 and wait 10 seconds or more.

(c) Check for DTCs.

Body Electrical > Headlight Control > Trouble Codes Body Electrical > Headlight Control (Sub) > Trouble Codes

Result	Proceed to
B24451C is output	A
B24441C is output	B

A

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

B

REPLACE HEADLIGHT UNIT ASSEMBLY RH

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