LIGHTING SYSTEM IG Signal Circuit

DTC Code DTC Name
IG Signal Circuit

DESCRIPTION

The main body ECU receives an ignition switch signal used to control the exterior light control system for automatic light control*1, light auto turn off control and daytime running light control*2.

  • *1: w/ Automatic Light Control System

  • *2: w/ Daytime Running Light System

WIRING DIAGRAM

E183427E02

CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

  1. READ VALUE USING INTELLIGENT TESTER

    1. Using the intelligent tester, read the Data List (Click here).

      Table 1. Main Body

      Tester Display

      Measurement Item/Range

      Normal Condition

      Diagnostic Note

      IG SW

      Ignition switch ON signal / ON or OFF

      ON: Ignition switch ON

      OFF: Ignition switch off

      -

      OK

      The display is as specified in the normal condition column.

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    (Click here)

  2. CHECK HARNESS AND CONNECTOR (IG POWER SOURCE CIRCUIT)

    1. E354478E01

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      ECU-IG NO. 1 fuse terminal - Body ground

      Ignition switch off

      Below 1 V

      Ignition switch ON

      11 to 14 V
      Table 2. Text in Illustration

      *1

      Main Body ECU (Instrument Panel Junction Block Assembly)

      *2

      ECU-IG NO. 1 Fuse

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    REPAIR OR REPLACE HARNESS OR CONNECTOR