Headlight (Hi-Beam) Circuit

LIGHTING: LIGHTING SYSTEM: Headlight (HI-BEAM) Circuit
- Headlight (HI-BEAM) Circuit

DESCRIPTION

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

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HEADLIGHT

(a) Check the operation of Low beam headlights.

OK:

Low beam headlights operate normally.

HINT
If low beam headlights do not operate, refer to Problem Symptoms Table (Both left and right low beam headlights do not illuminate.)

NG -- GO TO PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures
OK -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect Techstream to the DLC3.

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

(c) Turn Techstream on.

(d) Select the following menu items: Body Electrical / Main Body / Active Test.

(e) Check that the relay operates.

Main Body:





OK:

Relay operates. (High beam headlights illuminate.)

NG -- INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

3. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY

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





(b) Measure the voltage between the loading slot of each fuse and body ground.

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FUSE - BODY GROUND)
OK -- Continue to next step.

4. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY

(a) Remove the engine room junction block assembly from the engine room relay block.





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

Standard voltage:





NG -- REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY
OK -- Continue to next step.

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

(a) Disconnect the 2D engine room junction block assembly connector.





(b) Disconnect the 1D instrument panel junction block connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)