DESCRIPTION The headlight ECU sub-assembly LH and headlight ECU sub-assembly RH internally boost the power supply voltage to ensure a constant supplied current for the low beam LED of their respective headlight. By monitoring the LED power supply voltage, abnormal current and malfunctions can be detected.
WIRING DIAGRAM ![]() CAUTION / NOTICE / HINT NOTICE:
PROCEDURE
(a) Connect the Techstream to the DLC3. (b) Turn the power 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
(a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Operate the light control switch to turn on the low beam headlights and wait 10 seconds or more. (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 CodesOK: DTC B2439 and B243A are not output.
(a) Remove each headlight ECU sub-assembly, interchange the headlight assembly LH with RH and connect the connectors. Click here
(a) Connect the Techstream to the DLC3. (b) Turn the power 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
(a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Operate the light control switch to turn on the low beam headlights and wait 10 seconds or more. (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
(a) Remove each headlight ECU sub-assembly, interchange the headlight assembly RH with LH and connect the connectors. Click here
(a) Connect the Techstream to the DLC3. (b) Turn the power 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
(a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Operate the light control switch to turn on the low beam headlights and wait 10 seconds or more. (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
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Sfi System: Lost Communication with Active Grille Air Shutter Module "A" Missing Message (U028487)
MONITOR DESCRIPTION The ECM and swing grille actuator assembly (active grille air shutter ECU) send and receive signals via CAN communication. If a communication error occurs between the ECM and swing grille actuator assembly, the ECM stores this DTC. DTC No. Detection Item DTC Detection Condition T ...