Toyota Yaris: Lighting System / Low Beam LH Circuit Voltage Out of Range (B24441C,B24451C)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System / 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 light control LED ECU 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

  • Ignition switch is to ON, low beam headlights illuminated
Malfunction status:
  • Headlight lens sub-assembly LH (BIN resistance) malfunction
  • Open/short in headlight lens sub-assembly LH (BIN resistance) circuit
  • 10 seconds or more
  • Headlight lens sub-assembly LH
  • Harness or connector
  • Light control LED ECU LH

B24451C

Low Beam RH Circuit Voltage Out of Range

  • Ignition switch is to ON, low beam headlights illuminated
Malfunction status:
  • Headlight lens sub-assembly RH (BIN resistance) malfunction
  • Open/short in headlight lens sub-assembly RH (BIN resistance) circuit
  • 10 seconds or more
  • Headlight lens sub-assembly RH
  • Harness or connector
  • Light control LED ECU RH

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CXPI communication malfunctions before troubleshooting this symptom.

    Click here

  • First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.

    Click here

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Turn the ignition switch to ON.

(b) Wait 10 seconds or more.

(c) Turn the GTS on.

(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.

(e) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

B24441C and B24451C 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 LENS SUB-ASSEMBLY LH

(a) Interchange the Headlight lens sub-assembly LH with RH and connect the connectors to them.

Click here

(b) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs
NEXT

4.

CHECK FOR DTC

(a) Turn the ignition switch to ON.

(b) Wait 10 seconds or more.

(c) Turn the GTS on.

(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.

(e) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

DTC B24441C is output

A

DTC B24451C is output

B

B

REPLACE HEADLIGHT LENS SUB-ASSEMBLY LH

A

5.

CHECK HARNESS AND CONNECTOR (CHECK HEADLIGHT LENS SUB-ASSEMBLY LH - LIGHT CONTROL LED ECU LH)

(a) Remove the headlight unit assembly LH.

Click here

(b) Remove the wire harness.

Click here

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

B - [12] - C - [5]

Always

Below 1 Ω

B - [13] - C - [4]

Always

Below 1 Ω

*a

Front view of wire harness connector

(Light Control LED ECU LH)

*b

Front view of wire harness connector

(Headlight Lens Sub-assembly LH)

OK

REPLACE LIGHT CONTROL LED ECU LH

NG

REPLACE HARNESS AND CONNECTOR

6.

CHECK HEADLIGHT LENS SUB-ASSEMBLY RH

(a) Interchange the Headlight lens sub-assembly RH with LH and connect the connectors to them.

Click here

(b) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs
NEXT

7.

CHECK FOR DTC

(a) Turn the ignition switch to ON.

(b) Wait 10 seconds or more.

(c) Turn the GTS on.

(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.

(e) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

DTC B24451C is output

A

DTC B24441C is output

B

B

REPLACE HEADLIGHT LENS SUB-ASSEMBLY RH

A

8.

CHECK HARNESS AND CONNECTOR (CHECK HEADLIGHT LENS SUB-ASSEMBLY RH - LIGHT CONTROL LED ECU RH)

(a) Remove the headlight unit assembly RH.

Click here

*a

Front view of wire harness connector

(Light Control LED ECU RH)

*b

Front view of wire harness connector

(Headlight Lens Sub-assembly RH)

(b) Remove the wire harness.

Click here

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

B - [12] - C - [5]

Always

Below 1 Ω

B - [13] - C - [4]

Always

Below 1 Ω

OK

REPLACE LIGHT CONTROL LED ECU RH

NG

REPLACE HARNESS AND CONNECTOR

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