Toyota CH-R Service Manual: Left Headlight ECU Variation Error (B2456)

Toyota CH-R Service Manual / Lighting (ext) / Lighting System / Left Headlight ECU Variation Error (B2456)

DESCRIPTION

This DTC is output when a headlight ECU sub-assembly LH that is incompatible with the vehicle is installed.

The headlight ECU sub-assembly LH outputs DTC B2456.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B2456

Left Headlight ECU Variation Error

Headlight ECU sub-assembly LH variation mismatch
  • Headlight ECU sub-assembly LH
  • ECM
  • Main body ECU (multiplex network body ECU)

-

CAUTION / NOTICE / HINT

NOTICE:

  • After the headlight ECU sub-assembly LH is replaced, vehicle information registration and initialization are necessary.

    Click here

  • Before replacing the ECM or main body ECU (multiplex network body ECU), refer to Registration.*1

    Click here

    • *1: w/ Smart Key System

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) Turn on the headlights using the light control switch.

(c) Check for DTCs.

Click here

Body Electrical > HL AutoLeveling > Trouble Codes

Result

Proceed to

DTC B2456 output does not occur

A

DTC B2456 output occurs

B
A

USE SIMULATION METHOD TO CHECK

B

3.

CHECK ECM

(a) Check that the ECM part number matches the vehicle.

Result

Proceed to

ECM part number matches vehicle

A

ECM part number does not match

B
B

REPLACE ECM

A

4.

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Check that the main body ECU (multiplex network body ECU) part number matches the vehicle.

Result

Proceed to

Main body ECU (multiplex network body ECU) part number matches vehicle

A

Main body ECU (multiplex network body ECU) part number does not match

B
A

REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH

B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Light Sensor Circuit Malfunction (B1244)
    DESCRIPTION The automatic light control sensor detects ambient light. The sensor creates an electrical signal based on the amount of light detected, and sends the signal to the main body ECU (mul ...

    Control Module Communication Bus OFF (U0073,U0100,U0129,U0142)
    DESCRIPTION These DTCs are stored when the CAN communication system is malfunctioning. DTC No. Detection Item DTC Detection Condition Trouble Area ...

    Other materials:

    Toyota CH-R Service Manual > Steering Lock System: Diagnostic Trouble Code Chart
    DIAGNOSTIC TROUBLE CODE CHART Steering Lock System DTC No. Detection Item DTC Detection Condition Note Link B2781 Open / Short in Steering Lock ECU One of the following conditions is met (1-trip detection ...

    Toyota CH-R Service Manual > Spiral Cable: Installation
    INSTALLATION PROCEDURE 1. INSPECT SPIRAL CABLE SUB-ASSEMBLY (w/o Steering Heater) NOTICE: If the steering sensor is installed to a misaligned spiral cable sub-assembly, DTCs for an abnormal steering sensor value such as DTC B1801, C1231 and C1433 will be stored and it will be impossible to c ...

    Toyota CH-R Owners Manual

    Toyota CH-R Service Manual

    © 2017-2025 Copyright www.tochr.net
    0.0105