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

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > HL AutoLeveling > Clear DTCs

2.	CHECK FOR DTC

(a) Turn the ignition switch to ON.

(b) Turn on the headlights using the light control switch.

Click here

Body Electrical > HL AutoLeveling > Trouble Codes

Result	Proceed to
DTC B2456 output does not occur	A
DTC B2456 output occurs	B

USE SIMULATION METHOD TO CHECK

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

REPLACE ECM

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

REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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