LO-Beam Headlight Does Not Illuminate
LIGHTING: LIGHTING SYSTEM: LO-beam Headlight does not Illuminate
- LO-beam Headlight does not Illuminate
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
First perform the communication function inspections in HOW TO PROCEED WITH TROUBLESHOOTING to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.
HINT
If a discharge headlight bulb's condition cannot be determined through a visual check, replace with a normally functioning bulb or interchange the left and right bulbs and check its condition.
PROCEDURE
1. PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT LO)
(a) Using the Techstream, perform the Active Test.
Body No. 5
OK:
Condition sign can be displayed.
NG -- CHECK MULTIPLEX NETWORK FRONT LIGHT ECU (HRLY VOLTAGE)
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM (HEADLIGHT DIMMER SWITCH)
(a) Using the Techstream, read the Data List.
Combination Switch
OK:
Condition sign can be displayed.
NG -- CHECK WINDSHIELD WIPER SWITCH (OPERATION)
OK -- REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY Removal
3. CHECK WINDSHIELD WIPER SWITCH (OPERATION)
(a) Temporarily replace the windshield wiper switch with a new or normally functioning one Removal.
(b) Check that the LO-beam headlight illuminates.
OK:
LO-beam headlight illuminates.
NG -- CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK FRONT LIGHT ECU - WINDSHIELD WIPER SWITCH)
OK -- END (REPLACE WINDSHIELD WIPER SWITCH) Removal
4. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK FRONT LIGHT ECU - WINDSHIELD WIPER SWITCH)
(a) Disconnect the A50 ECU connector.
(b) Disconnect the L25 switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MULTIPLEX NETWORK FRONT LIGHT ECU
5. CHECK MULTIPLEX NETWORK FRONT LIGHT ECU (HRLY VOLTAGE)
(a) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK FRONT LIGHT ECU - ENGINE ROOM NO. 2 RELAY BLOCK)
OK -- Continue to next step.
6. CHECK ENGINE ROOM NO. 2 RELAY BLOCK
(a) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- REPLACE ENGINE ROOM NO. 2 RELAY BLOCK ASSEMBLY
OK -- Continue to next step.
7. INSPECT ENGINE ROOM NO. 2 RELAY BLOCK
(a) Disconnect the 2A relay block connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE ENGINE ROOM NO. 2 RELAY BLOCK
OK -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 2 RELAY BLOCK - HEADLIGHT)
(a) Disconnect the 2A relay block connector.
(b) Disconnect the B1 or B11 light connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
for LH
for RH
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
9. INSPECT HEADLIGHT ASSEMBLY
(a) Remove the headlight assembly Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE HEADLIGHT ASSEMBLY Removal
OK -- Continue to next step.
10. CHECK HEADLIGHT CONTROL ECU (OPERATION)
(a) Temporarily replace the headlight control ECU with a new or normally functioning one Disassembly.
(b) Check that the LO-beam headlight illuminates.
OK:
LO-beam headlight illuminates.
NG -- REPLACE MULTIPLEX NETWORK FRONT LIGHT ECU
OK -- END (REPLACE HEADLIGHT CONTROL ECU) Disassembly
11. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK FRONT LIGHT ECU - ENGINE ROOM NO. 2 RELAY BLOCK)
(a) Disconnect the A50 ECU connector.
(b) Disconnect the 2G relay block connector.
(c) 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.
12. CHECK ENGINE ROOM NO. 2 RELAY BLOCK
(a) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- INSPECT ENGINE ROOM NO. 2 RELAY BLOCK
OK -- REPLACE ENGINE ROOM NO. 2 RELAY BLOCK
13. INSPECT ENGINE ROOM NO. 2 RELAY BLOCK
(a) Disconnect the 2E relay block connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE ENGINE ROOM NO. 2 RELAY BLOCK
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ENGINE ROOM NO. 2 RELAY BLOCK)