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
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 -- INSPECT HEADLIGHT DIMMER RELAY (DIM)
OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Exterior Lighting System
3. 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:
Text in Illustration
NG -- REPLACE HEADLIGHT DIMMER RELAY
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (H-LP HI MAIN FUSE - 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.
5. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - HEADLIGHT ASSEMBLY)
(a) Disconnect the A8 or A39 headlight assembly connector (for LED headlight).
(b) Disconnect the A10 or A41 headlight assembly connector (for expect LED headlight).
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for LH side, for LED Headlight
for RH side, for LED Headlight
for LH side, for expect LED Headlight
for RH side, for expect LED Headlight
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - MAIN BODY ECU)
(a) Disconnect the 2C 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 -- Continue to next step.
7. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
(a) Remove the instrument panel junction block assembly.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Removal
OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal