LIGHTING SYSTEM IG Signal Circuit

DESCRIPTION

• The main body ECU receives IG signal to control the exterior light control system as shown below:




• Automatic light control




• Light auto turn off control




• Daytime running light control

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the tester on.

   4. Enter the following menus: Body / Main Body / Data List.

   5. According to the display on the tester, read the Data List.

      Main Body

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      IG SW	Ignition switch or engine switch IG signal ON or OFF	ON: Ignition switch ON OFF: Ignition switch off	-

      OK
      Normal conditions listed above are displayed.

   
   

   NG

   REPLACE MAIN BODY ECU Click here

   OK

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

2. REPLACE MAIN BODY ECU

   
   

   1. Temporarily replace the main body ECU with a new or normally functioning one Click here.

   
   

   NEXT

3. READ VALUE USING INTELLIGENT TESTER

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the tester on.

   4. Enter the following menus: Body / Main Body / Data List.

   5. According to the display on the tester, read the Data List.

      Main Body

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      IG SW	Ignition switch or engine switch IG signal ON or OFF	ON: Ignition switch ON OFF: Ignition switch off	-

      OK
      Normal conditions listed above are displayed.

   
   

   NG

   REPLACE INSTRUMENT PANEL JUNCTION BLOCK

   OK

   END (MAIN BODY ECU DEFECTIVE)