Headlight (Hi-Beam) Circuit
LIGHTING: LIGHTING SYSTEM: Headlight (HI-BEAM) Circuit
- Headlight (HI-BEAM) Circuit
DESCRIPTION
The body ECU controls the headlight relay, No. 2 daytime running light relay (Marking: DRL NO. 2) and No. 4 daytime running light relay (Marking: DRL NO. 4).
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. 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 the operation.
Main Body (Main Body ECU)
OK:
Headlight (HIGH) comes on.
OK -- CHECK WIRE HARNESS (MAIN BODY ECU - DIMMER SWITCH)
NG -- Continue to next step.
2. CHECK HEADLIGHT (LOW)
(a) Check that the headlight (LOW) comes on when the light control switch is on (HEAD).
OK:
Headlight (LOW) comes on.
NG -- GO TO HEADLIGHT RELAY CIRCUIT
OK -- Continue to next step.
3. INSPECT FUSE (HEAD LH, HEAD RH)
(a) Remove the HEAD LH fuse and HEAD RH fuse from the engine room No. 2 relay block.
(b) Measure the resistance of the fuses.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
4. INSPECT DAYTIME RUNNING LIGHT RELAY (Marking: DRL NO. 2, DRL NO. 3, DRL NO. 4)
(a) Remove the No. 2 relay, No. 3 relay and No. 4 relay from the engine room No. 2 relay block.
(b) Measure the resistance of the relays.
Standard resistance:
No. 2, No. 4
No. 3
NG -- REPLACE DAYTIME RUNNING LIGHT RELAY
OK -- Continue to next step.
5. INSPECT HEADLIGHT BULB (HIGH)
(a) Remove the headlight bulb (HIGH).
(b) Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1, then check that the bulb illuminates.
NG -- REPLACE HEADLIGHT BULB (HIGH)
OK -- Continue to next step.
6. CHECK WIRE HARNESS (MAIN BODY ECU - BATTERY)
(a) Disconnect the E16 main body ECU connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
7. CHECK WIRE HARNESS (MAIN BODY ECU)
(a) Remove the headlight relay from the engine room No. 2 relay block.
(b) Disconnect the E15 main body ECU connector.
(c) Measure the voltage of the wire harness side connector.
Standard voltage:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
8. CHECK WIRE HARNESS (HEADLIGHT RELAY - NO. 3 DAYTIME RUNNING LIGHT RELAY AND BODY GROUND)
(a) Remove the No. 3 daytime running light relay from the engine room No. 2 relay block.
(b) Measure the voltage and resistance of the relay block.
Standard voltage:
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
9. CHECK WIRE HARNESS (BATTERY - NO. 2 DAYTIME RUNNING LIGHT RELAY, BULB AND BODY GROUND)
(a) Remove the No. 2 daytime running light relay from the engine room No. 2 relay block.
(b) Remove the A14 and A22 headlight bulb connectors.
(c) Measure the voltage and resistance of the relay block.
Standard voltage:
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)
10. CHECK WIRE HARNESS (MAIN BODY ECU - DIMMER SWITCH)
(a) Disconnect the E15 main body ECU connector.
(b) Disconnect the E12 headlight dimmer switch connector.
(c) Disconnect the IJ instrument panel junction block connector.
(d) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
11. INSPECT HEADLIGHT DIMMER SWITCH
(a) Remove the headlight dimmer switch.
(b) Measure the resistance of the switch.
Standard resistance:
NG -- REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY
OK -- REPAIR OR REPLACE HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - BODY GROUND)