Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Right Headlight ECU Malfunction (B242C,B242D)

DESCRIPTION

The headlight ECU sub-assembly LH or headlight ECU sub-assembly RH stores a DTC if it detects an internal malfunction.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B242C

Right Headlight ECU Malfunction

  • The engine switch is on (IG).
  • Headlight ECU sub-assembly RH internal malfunction
  • Maximum 15 minutes

Headlight ECU sub-assembly RH

Headlight ECU sub-assembly RH

B242D

Left Headlight ECU Malfunction

  • The engine switch is on (IG).
  • Headlight ECU sub-assembly LH internal malfunction
  • Maximum 15 minutes

Headlight ECU sub-assembly LH

Headlight ECU sub-assembly LH

CAUTION / NOTICE / HINT

NOTICE:

If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information the headlight ECU sub-assembly LH.

Click here

PROCEDURE

1.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / HL AutoLeveling or HL AutoLeveling (Sub) / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > HL AutoLeveling > Clear DTCs Body Electrical > HL AutoLeveling (Sub) > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Wait for at least maximum 15 minutes.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / HL AutoLeveling or HL AutoLeveling (Sub) / Trouble Codes.

(f) Check for DTCs.

Body Electrical > HL AutoLeveling > Trouble Codes Body Electrical > HL AutoLeveling (Sub) > Trouble Codes

OK:

DTC B242C and B242D are not output.

Result

Proceed to

OK

A

NG (DTC B242C is output)

B

NG (DTC B242D is output)

C

A

USE SIMULATION METHOD TO CHECK

B

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

C

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

    Automatic High Beam Camera (B124C)

    Open in IG Circuit (B242E)

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