High Beam Headlight Circuit
LIGHTING (EXT): LIGHTING SYSTEM: High Beam Headlight Circuit
- High Beam Headlight Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the high beam headlights.
WIRING DIAGRAM
1. w/ Daytime Running Light System:
2. w/o Daytime Running Light System:
INSPECTION PROCEDURE
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
1. CHECK OPERATION (LOW BEAM HEADLIGHTS)
(a) Check the operation of the 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 power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Active Test.
(e) Check that the high beam headlights illuminate.
Main Body
OK:
High beam headlights illuminate.
NG -- CHECK VEHICLE CONDITION
OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Exterior Lighting System
3. CHECK VEHICLE CONDITION
(a) Check the vehicle condition.
Result:
B -- INSPECT HEADLIGHT DIMMER RELAY (DIM)
A -- Continue to next step.
4. INSPECT RUNNING LIGHT RELAY (DRL)
(a) Connect a positive (+) lead from the battery to terminal 6 (+B).
(b) Connect a negative (-) lead from the battery to terminals 4 (H) and 3 (E).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPLACE RUNNING LIGHT RELAY
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (BATTERY - DRL RELAY)
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (DRL RELAY - BODY GROUND)
(a) 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.
7. CHECK HARNESS AND CONNECTOR (DRL RELAY - MAIN BODY ECU)
(a) Disconnect the F8 main body ECU (multiplex network body ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Testing and Inspection
8. INSPECT HEADLIGHT DIMMER RELAY (DIM)
(a) Remove the headlight dimmer relay from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE HEADLIGHT DIMMER RELAY
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT DIMMER RELAY)
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - MAIN BODY ECU)
(a) Disconnect the F8 main body ECU (multiplex network body ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Testing and Inspection