LIGHTING SYSTEM IG Signal Circuit

DESCRIPTION

This circuit detects the ignition switch ON or off condition, and sends it to the main body ECU.

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   READ VALUE USING INTELLIGENT TESTER

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the intelligent tester on.

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

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

      Table 1. Main Body

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

      OK
      Normal conditions listed above are displayed.

      Table 2. Result

      Result	Proceed to
      OK	A
      NG (w/ Stop and Start System)	B
      NG (w/o Stop and Start System)	C

   
   
   • A

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

   • BClick here
   • CClick here
2. Click here

   CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BACKUP BOOST CONVERTER)

   
   
   1. 

      Disconnect the 3A instrument panel junction block assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition 3A-40 - Body ground Ignition switch ON 11 to 14 V

      Table 3. Text in Illustration

      *a	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)

      Table 4. Result

      Result	Proceed to
      NG	A
      OK	B

   
   
   • A

     GO TO STOP AND START SYSTEM (Click here)

   • BClick here
3. Click here

   CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY AND BODY GROUND)

   
   

   1. for LHD

      
      

      1. Disconnect the 3E and 3B instrument panel junction block assembly connectors.

   2. for RHD

      
      

      1. Disconnect the 3F and 3B instrument panel junction block assembly connectors.

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

      Standard Voltage
      Table 5. for LHD Tester Connection Switch Condition Specified Condition 3E-1 - Body ground Always 11 to 14 V
      Table 6. for RHD Tester Connection Switch Condition Specified Condition 3F-1 - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition 3B-8 - Body ground Always Below 1 Ω

      Table 7. Text in Illustration

      *A	for LHD
      *B	for RHD
      *a	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

4. Click here

   CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CERTIFICATION ECU OR IGNITION SWITCH)

   
   

   1. Reconnect the instrument panel junction block assembly connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition 3A-29 - Body ground Ignition switch ON 11 to 14 V

      Table 8. Text in Illustration

      *a	Component with harness connected (Instrument Panel Junction Block Assembly)

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

5. Click here

   CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

   
   

   1. Disconnect the 3A instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 3A-40 - 3A-54 Always Below 1 Ω 3A-40 - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

6. Click here

   REPLACE MAIN BODY ECU

   
   

   1. Temporarily replace the main body ECU with a new functioning one (Click here).

   
   
   • NEXTClick here
7. Click here

   READ VALUE USING INTELLIGENT TESTER

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the intelligent tester on.

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

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

      Table 9. Main Body

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

      OK
      Normal conditions listed above are displayed.

   
   
   • OK

     END (MAIN BODY ECU DEFECTIVE)

   • NG

     REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY