Toyota Corolla Cross Owners & Service Manuals

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

Toyota Corolla Cross (2022-2026) 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

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