Toyota RAV4 manuals

Toyota Sienna Service Manual: Light Sensor Circuit Malfunction

DTC B1244 Light Sensor Circuit Malfunction

DESCRIPTION

This DTC is output when failure in the light sensor circuit is detected.

DTC No.

DTC Detection Condition

Trouble Area

B1244

  • Malfunction of automatic light control sensor
  • Open or short of automatic light control sensor circuit
  • Automatic light control sensor
  • Harness or connector
  • Multiplex network body ECU

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to DLC3.
  2.  Turn the ignition switch ON and push the intelligent tester main switch ON.
  3.  Select the items below in the DATA LIST, and read the displays on the intelligent tester

BODY NO.1:

BODY NO.1

2 CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR)

  1. Check for open or short circuit in the harness and the connector between the terminal 6 of the automatic light control sensor and the terminal B6-6 of the multiplex network body ECU.
  2.  Check for open or short circuit in the harness and the connector between the terminal 3 of the automatic light control sensor and the terminal B6-4 of the multiplex network body ECU.
  3.  Check for open or short circuit in the harness and the connector between the terminal 5 of the automatic light control sensor and the terminal B6-5 of the multiplex network body ECU

3 INSPECT AUTOMATIC LIGHT CONTROL SENSOR

  1. Measure voltage between the terminal 3 and the terminal 5 of the automatic light control sensor

Standard

Standard

4 INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

  1. Measure voltage between the terminal B6-6 and the terminal B6-4 of the multiplex network body ECU in the instrument panel junction block assembly.

 INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Voltage

Voltage

REPLACE AUTOMATIC LIGHT CONTROL SENSOR

Diagnostic trouble code chart
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