DTC B1244: Light Sensor Circuit [12/2021 - 11/2024]: Description

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The automatic light control sensor detects ambient light. The sensor creates an electrical signal based on the amount of light detected, and sends the signal to the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) turns on or off the headlights and taillights according to the signal.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Note
B1244	Light Sensor Circuit	Detection condition: The ignition switch is ON Malfunction status: Either of the following conditions is met: Malfunction in automatic light control sensor Open or short in automatic light control sensor circuit Malfunction duration: 5 seconds or more	Automatic light control sensor Harness or connector Main body ECU (multiplex network body ECU)	Main Body	w/ Automatic Light Control System

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

Note

B1244

Light Sensor Circuit

Detection condition:

The ignition switch is ON

Malfunction status:

Either of the following conditions is met:
- Malfunction in automatic light control sensor
- Open or short in automatic light control sensor circuit

Malfunction duration:

5 seconds or more

Automatic light control sensor
Harness or connector
Main body ECU (multiplex network body ECU)

Main Body

w/ Automatic Light Control System