Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: CAN Register Fixing Internal Electronic Failure (U100049)

Toyota Corolla Cross (2022-2025) Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System (w/ Afs) / CAN Register Fixing Internal Electronic Failure (U100049)

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.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U100049

CAN Register Fixing Internal Electronic Failure

 Detection condition:
  • The ignition switch is ON
Malfunction status:
  • CAN communication failure
Malfunction duration:
  • -

Headlight ECU sub-assembly LH

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U100049

CAN Register Fixing Internal Electronic Failure

 Detection condition:
  • The ignition switch is ON
Malfunction status:
  • CAN communication failure
Malfunction duration:
  • -

Headlight ECU sub-assembly RH

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

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Headlight Control > Clear DTCs Body Electrical > Headlight Control (Sub) > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Headlight Control > Trouble Codes Body Electrical > Headlight Control (Sub) > Trouble Codes

OK:

DTC U100049 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

    READ NEXT:

     Turn Signal Switch Circuit

    DESCRIPTION The steering sensor receives the turn signal switch information and controls the turn signal lights. WIRING DIAGRAM PROCEDURE 1. READ VALUE USING GTS (a) Read the Data List a

     Headlight Dimmer Switch Circuit

    DESCRIPTION The steering sensor receives the following switch information: Light control switch in DRL OFF*1, TAIL, HEAD, AUTO position Dimmer switch in high, low or high flash (pass) position

     Parking Light/Daytime Running Light Circuit

    DESCRIPTION Parking light function: When the main body ECU (multiplex network body ECU) receives the light control switch position signal, it sends an illumination request signal to the headlight E

    SEE MORE:

     Inspection

    INSPECTION PROCEDURE 1. INSPECT BACK DOOR OPENER SWITCH ASSEMBLY (w/ Smart Key System) (a) Check the operation of the opener switch. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition

     How To Proceed With Troubleshooting

    CAUTION / NOTICE / HINT HINT: Use the following procedure to troubleshoot the wireless charging system. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT 2. CUSTOMER PROBLEM ANALYSIS HINT: In troubleshooting, confirm that the problem sympto

    © 2020-2025 Copyright www.tcorollacross.com PT NL