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)

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