Headlight (HI-BEAM) Circuit

DESCRIPTION

The front controller receives headlight HI switch information from the combination switch, and turns on the headlights.
BI-function:
This function is activated by a HI beam turn ON signal from the front controller and activates the headlight solenoid built into the headlight unit to slide the shade down.
When the LO beam headlight is switched on, the upper illumination area of the discharge bulb is blocked by the shade and only the lower illumination area is used. When the HI beam is turned on, the headlight solenoid slides the shutter down to allow use of the upper illumination area, thus increasing the illumination area and improving visibility when the HI beam is on.

WIRING DIAGRAM

INSPECTION PROCEDURE

1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER

1. Connect the intelligent tester to the DLC3.

2. Turn the engine switch on (IG).

3. Turn the intelligent tester main switch on.

4. Select the item below in the ACTIVE TEST and then check the headlight operation.

   ACTIVE TEST: Body No. 5 (Front Controller) 

   Item	Test Details	Diagnostic Note
   Light Head (High)	Headlight (High) ON / OFF	-

   OK:

   Headlight assembly illuminates.
   

NG	Go to step 2

OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2. INSPECT FUSE (H-LP UPR)

1. Remove the H-LP UPR fuse from the engine room No. 2 relay block.

2. Measure the resistance of the fuses.

   Standard resistance:

   Below 1 Ω
   

NG	REPLACE FUSE

OK

3. CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 2 RELAY BLOCK - BATTERY)

1. Disconnect the 2E relay block connector.

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

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   2E-2 - Body ground	Always	10 to 14 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4. CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 2 RELAY BLOCK - BODY GROUND)

1. Check the wire harness between the headlight (LH) and engine room No. 2 relay block, and headlight (LH) and body ground.

   1. Disconnect the 2G relay block connector.

   2. Disconnect the B12 headlight (LH) connector.

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

      Standard resistance:

      Tester Connection	Condition	Specified Condition
      2G-13 - B12-2 (HI)	Always	Below 1 Ω
      2G-13 or B12-2 (HI) - Body ground	Always	10 kΩ or higher
      B12-1 (E) - Body ground	Always	Below 1 Ω

2. Check the wire harness between the headlight (RH) and engine room No. 2 relay block, and headlight (RH) and body ground.

   1. Disconnect the 2G relay block connector.

   2. Disconnect the B2 headlight (RH) connector.

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

      Standard resistance:

      Tester Connection	Condition	Specified Condition
      2G-12 - B2-2 (HI)	Always	Below 1 Ω
      2G-12 or B2-2 (HI) - Body ground	Always	10 kΩ or higher
      B2-1 (E) - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE ENGINE ROOM NO. 2 R/B (FRONT CONTROLLER)