High Beam Headlight Circuit

LIGHTING (EXT): LIGHTING SYSTEM: High Beam Headlight Circuit
- High Beam Headlight Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the high beam headlights.

WIRING DIAGRAM

1. w/ Daytime Running Light Control





2. w/o Daytime Running Light Control





INSPECTION PROCEDURE

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

PROCEDURE

1. CHECK OPERATION (LOW BEAM HEADLIGHTS)

(a) Check the operation of the low beam headlights.

OK:

Low beam headlights operate normally.

NG -- GO TO PROBLEM SYMPTOMS TABLE Exterior Lighting System
OK -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) Check that the high beam headlights illuminate.

Main Body





OK:

High beam headlights illuminate.

NG -- CHECK VEHICLE CONDITION

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Exterior Lighting System

3. CHECK VEHICLE CONDITION

(a) Check the vehicle condition.

Result:





B -- INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
A -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (H-LP HI MAIN FUSE - RUNNING LIGHT RELAY (DRL))

(a) Disconnect the running light relay (DRL) connector.

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

Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY (DRL) - INSTRUMENT PANEL JUNCTION BLOCK AND BODY GROUND)

(a) Disconnect the 2C instrument panel junction block assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY (DRL) - HEADLIGHT ASSEMBLY AND BODY GROUND)

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

Standard Resistance:

LH Side





RH Side





* *1: for LED Headlight

* *2: for Halogen Headlight

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly Removal.





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

Standard Resistance:





Text in Illustration





NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Removal
OK -- Continue to next step.

8. REPLACE RUNNING LIGHT RELAY (RUNNING LIGHT RELAY (DRL))

(a) Temporarily replace the running light relay (DRL) with a new or normally functioning one.

(b) Check that the high beam headlights operate normally.

OK:

High beam headlights illuminate.

NG -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal

OK -- END (RUNNING LIGHT RELAY (DRL) WAS DEFECTIVE)

9. INSPECT DIM RELAY (DIM)

(a) Remove the headlight dimmer relay from the engine room relay block.





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

Standard Resistance:





NG -- REPLACE HEADLIGHT DIMMER RELAY
OK -- Continue to next step.

10. CHECK HARNESS AND CONNECTOR (H-LP HI MAIN FUSE - DIM RELAY)

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

Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

11. CHECK HARNESS AND CONNECTOR (DIM RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 2C instrument panel junction block assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

12. CHECK HARNESS AND CONNECTOR (DIM RELAY - HEADLIGHT ASSEMBLY AND BODY GROUND)

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

Standard Resistance:

LH Side





RH Side





* *1: for LED Headlight

* *2: for Halogen Headlight

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

13. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly Removal.





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

Standard Resistance:





Text in Illustration





NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Removal

OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal