Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001AULS
Model Year Start: 2019 Model: GR Corolla Prod Date Range: [06/2018 - 09/2022]
Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): U1000; CAN Communication Failure (Message Registry); 2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022]

DTC

U1000

CAN Communication Failure (Message Registry)

DESCRIPTION

The headlight ECU sub-assembly LH or headlight ECU sub-assembly RH stores this DTC if it detects an internal malfunction related to the CAN communication system.

AFS

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

U1000

CAN Communication Failure (Message Registry)

Detection condition:

  • The engine switch is on (IG).

Malfunction status:

  • CAN communication failure

Malfunction duration:

  • -

Headlight ECU sub-assembly LH

AFS

AFS (Sub)

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

U1000

CAN Communication Failure (Message Registry)

Detection condition:

  • The engine switch is on (IG).

Malfunction status:

  • CAN communication failure

Malfunction duration:

  • -

Headlight ECU sub-assembly RH

AFS (Sub)

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.

    Click here 2019 - 2021 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 06/2021]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): INITIALIZATION 2022 MY Corolla Corolla Hatchback GR Corolla [06/2021 - 09/2022]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): INITIALIZATION

  • When replacing the headlight ECU sub-assembly LH, always replace it with a new one. If a headlight ECU sub-assembly LH which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

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 / AFS or AFS (Sub) / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > AFS > Clear DTCs

Body Electrical > AFS (Sub) > Clear DTCs

NEXT

2.

CHECK FOR 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 / AFS or AFS (Sub) / Trouble Codes.

(e) Check for DTCs.

Body Electrical > AFS > Trouble Codes

Body Electrical > AFS (Sub) > Trouble Codes

OK:

DTC U1000 is not output.

Result

Proceed to

OK

A

NG (DTC output from headlight ECU sub-assembly LH)

B

NG (DTC output from headlight ECU sub-assembly RH)

C
A

USE SIMULATION METHOD TO CHECK

B

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

C

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH