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

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

DESCRIPTION

This DTC is stored when a headlight ECU sub-assembly LH which is not compatible with the vehicle has been installed.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B2456

Left Headlight ECU Variation Error

Incompatible headlight ECU sub-assembly LH is installed
  • Headlight ECU sub-assembly LH
  • ECM

-

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.

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Body Electrical > HL AutoLeveling > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Turn the ignition switch to ON.

(b) Check for DTCs.

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Body Electrical > HL AutoLeveling > Trouble Codes

OK:

DTC B2456 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

3.

CHECK ECM

(a) Check if the part number of the ECM installed to the vehicle is correct.

OK:

Part number is correct.

OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

NG

REPLACE ECM

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