Headlight (Hi-Beam) Circuit

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

DESCRIPTION

The main body ECU receives light control switch and dimmer switch information signals from the headlight dimmer switch, and illuminates the headlight high beam.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT (HIGH))

(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 / Head Light Hi

(e) Check that the headlight (high) turns on/off.

Main Body





OK:

Headlight (High) turns on/off.

NG -- INSPECT FUSE (HEAD LH, HEAD RH)

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Exterior Lighting System

2. INSPECT FUSE (HEAD LH, HEAD RH)

(a) Remove the HEAD LH and HEAD RH fuse from the engine room relay block.





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

Standard Resistance:





(c) Reinstall the HEAD LH and HEAD RH fuses.

NG -- REPLACE FUSE
OK -- Continue to next step.

3. INSPECT HEADLIGHT (HIGH) BULB

(a) Temporarily replace the headlight (high) bulb with a new or normally functioning one Disassembly.

(b) Check that the headlight (high) come on.

OK:

Headlight (high) come on.

NG -- CHECK HARNESS AND CONNECTOR (HEADLIGHT (HIGH) BULB - HEADLIGHT DIMMER RELAY)

OK -- END

4. CHECK HARNESS AND CONNECTOR (HEADLIGHT (HIGH) BULB - HEADLIGHT DIMMER RELAY)





(a) for LH:

(1) Disconnect the A10 headlight (high) LH connector.

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

Standard Voltage:





(3) Reconnect the headlight (high) LH connector.

(b) for RH:

(1) Disconnect the A11 headlight (high) RH connector.

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

Standard Voltage:





(3) Reconnect the headlight (high) RH connector.

NG -- INSPECT HEADLIGHT DIMMER RELAY (DIM)

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (HEADLIGHT HIGH BULB - BODY GROUND)

5. INSPECT HEADLIGHT DIMMER RELAY (DIM)





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

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

Standard Resistance:





(c) Reinstall the DIM relay.

NG -- REPLACE DIM RELAY
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (DIM RELAY - HEAD RELAY)





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

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

Standard Voltage:





(c) Reinstall the DIM relay.

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

7. CHECK HARNESS AND CONNECTOR (DIM RELAY - HEADLIGHT (HIGH) BULB)

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





(b) for LH:

(1) Disconnect the A10 headlight (high) LH connector.

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

Standard Resistance:





(3) Reconnect the headlight (high) LH connector.

(c) for RH:

(1) Disconnect the A11 headlight (high) RH connector.

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

Standard Resistance:





(3) Reconnect the headlight (high) RH connector.

(d) Reinstall the DIM relay.

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

8. CHECK HARNESS AND CONNECTOR (DIM RELAY - MAIN BODY ECU)





(a) Disconnect the DB main body ECU connector.

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

Standard Voltage:





(c) Reconnect the main body ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU