Lighting System Headlight (Hi-Beam) Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

CHECK HARNESS AND CONNECTOR (ENGINE ROOM J/B ASSEMBLY - BATTERY AND BODY GROUND)

INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY

CHECK HARNESS AND CONNECTOR (ENGINE ROOM J/B ASSEMBLY - INSTRUMENT PANEL J/B ASSEMBLY)

CHECK HARNESS AND CONNECTOR (SHORT IN RELAY-DRIVEN CIRCUIT)

INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY

DESCRIPTION

HINT:

1. When a short circuit occurs between the power distributor and high beam headlight, the power distributor stops the high beam headlight relay operation (Fail-safe function).
   
2. The high beam headlight relay is built into the power distributor, so unlike conventional relays, it cannot be removed for inspection.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to the ON position and turn the intelligent tester main switch on.
   

3. Select the item below in the ACTIVE TEST and then check that the relay operates.
   
   

   Main Body (Main Body ECU):

   Item	Test Details	Diagnostic Note
   HEAD LIGHT (HI)	High beam headlights ON / OFF	-

   OK:

   High beam headlight relay operates. (High beam headlights illuminate.)
   

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

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   ID-3 (HRLY) - Body ground	Light control switch OFF → HEAD	10 to 14 V → Below 1 V
   ID-9 (DIM) - Body ground	Light control switch in HEAD and dimmer switch LOW → HIGH	10 to 14 V → Below 1 V

1. Disconnect the 1G engine room J/B assembly connector.
   

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

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   1G-1 - Body ground	Always	10 to 14 V

3. Disconnect the 1E engine room J/B assembly connector.
   

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

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   1E-11 - Body ground	Always	Below 1 Ω

1. Reconnect the 1G and 1E engine room J/B assembly connectors.
   

2. Disconnect the 1D engine room J/B assembly connector.
   

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

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   1D-8 - Body ground	Always	10 to 14 V
   1D-9 - Body ground	Always	10 to 14 V

1. Reconnect the 1D engine room J/B assembly connector.
   

2. Disconnect the ID instrument panel J/B connector.
   

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

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   ID-3 (HRLY) - Body ground	Always	10 to 14 V
   ID-9 (DIM) - Body ground	Always	10 to 14 V

1. Remove the H-LP (RH) fuse from the engine room J/B assembly.
   

2. Turn the light control switch to the HEAD position.
   

3. Turn the dimmer switch to the HIGH position.
   

4. Check if the high beam headlight LH illuminates.
   

5. Turn the dimmer switch to the LOW position.
   

6. Install the H-LP (RH) fuse and remove the H-LP (LH) fuse.
   

7. Turn the dimmer switch to the HIGH position.
   

8. Check if the high beam headlight RH illuminates.
   

   OK:

   Either high beam headlight LH or RH illuminates.
   

1. Remove the H-LP (RH) fuse and H-LP (LH) fuse from the engine room J/B 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	10 to 14 V
   H-LP (LH) Terminal - Body ground	Light control switch in HEAD and dimmer switch in HIGH	10 to 14 V