LIGHTING SYSTEM Headlight (HI-BEAM) Circuit

DESCRIPTION

The main body ECU receives a signal from the headlight dimmer switch assembly to control the HI-beam headlights.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK HEADLIGHT

   
   

   1. Check the operation of LO-beam headlights.

      OK
      LO-beam headlights operate normally.

   
   
   • OKClick here
   • NGClick here
2. Click here

   PERFORM ACTIVE TEST USING INTELLIGENT TESTER

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch on (IG).

   3. Turn the intelligent tester on.

   4. Select the following menu items: Body Electrical / Main Body / Active Test.

   5. Check that the relay operates.

      Table 1. Main Body:

      Tester Display	Test Part	Control Range	Diagnostic Note
      Head Light (HI)	HI-beam headlight relay	ON / OFF	-

      OK
      Relay operates. (HI-beam headlights illuminate.)

   
   
   • OKClick here
   • NGClick here
3. Click here

   INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY

   
   
   1. 

      Remove the H-LP (RH) fuse and H-LP (LH) fuse from the engine room junction block assembly.

   2. Measure the voltage between the loading slot of each fuse and body ground.

      Standard voltage
      Tester Connection Condition Specified Condition H-LP (RH) terminal - Body ground Light control switch in HEAD and dimmer switch in HIGH 11 to 14 V H-LP (LH) terminal - Body ground Light control switch in HEAD and dimmer switch in HIGH 11 to 14 V

   
   
   • OKClick here
   • NGClick here
4. Click here

   INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY

   
   
   1. 

      Remove the engine room junction block assembly from the engine room relay block.

   2. Connect the positive (+) lead from the battery to terminal 2G-1.

   3. Connect the negative (-) lead from the battery to terminal 2D-8, 2D-9 and 2E-11.

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

      Standard voltage
      Tester Connection Condition Specified Condition 2B-2 - Battery negative Always 11 to 14 V 2B-3 - Battery negative Always 11 to 14 V

   
   
   • OKClick here
   • NGClick here
5. Click here

   CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - MAIN BODY ECU)

   
   
   1. 

      Disconnect the 2D and 2E engine room junction block assembly connectors.

   2. Disconnect the 1D instrument panel junction block connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition 2E-11 - 1D-9 Always Below 1 Ω 2D-9 - 1D-3 Always Below 1 Ω 2E-11 - Body ground Always 10 kΩ or higher 2D-9 - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
6. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR

7. Click here

   REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY

8. Click here

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLEClick here

9. Click here

   REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

10. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUSE - BODY GROUND)

11. Click here

    GO TO PROBLEM SYMPTOMS TABLEClick here