Headlight (Hi-Beam) Circuit

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

DESCRIPTION

The main body ECU controls the high beam headlights.

WIRING DIAGRAM









INSPECTION PROCEDURE

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

PROCEDURE

1. CHECK HEADLIGHT

(a) Check the operation of 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 ignition switch to ON.

(c) Turn the Techstream on.

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

(e) Check that the relay operates.

Main Body





OK:

Relay operates. (High beam headlights illuminate.)

Result





C -- INSPECT HEADLIGHT DIMMER RELAY

B -- INSPECT RUNNING LIGHT RELAY

A -- REPLACE MAIN BODY ECU Removal

3. INSPECT RUNNING LIGHT RELAY

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

(b) Connect the positive (+) lead from the battery to terminal 6 (+B).





(c) Connect the negative (-) lead from the battery to terminal 4 (H).

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

Standard Voltage:





Text in Illustration





NG -- REPLACE RUNNING LIGHT RELAY Removal
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY - INSTRUMENT PANEL JUNCTION BLOCK)

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

(b) Disconnect the 2F instrument panel junction block assembly connector.

(c) 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.

5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.





(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

OK -- REPLACE MAIN BODY ECU Removal

6. INSPECT HEADLIGHT DIMMER RELAY

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





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

Standard Resistance:





Text in Illustration





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

7. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - INSTRUMENT PANEL JUNCTION BLOCK)

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

(b) Disconnect the 2F instrument panel junction block assembly connector.

(c) 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.

8. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.





(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

OK -- REPLACE MAIN BODY ECU Removal