Automatic Light Control Function Does Not Operate

LIGHTING: LIGHTING SYSTEM: Automatic Light Control Function does not Operate

Automatic Light Control Function does not Operate

WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE:
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.

PROCEDURE

1. READ VALUE USING TECHSTREAM (AUTOMATIC LIGHT CONTROL SENSOR)
(a) Using the Techstream, read the Data List.

Main Body





OK:
Condition sign can be displayed.
OK -- READ VALUE USING TECHSTREAM (HEADLIGHT DIMMER SWITCH)
NG -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR AND BODY GROUND)




(a) Disconnect the L12 ECU connector.
(b) Disconnect the M2 sensor 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.

3. CHECK MAIN BODY ECU (CLTB VOLTAGE)




(a) Disconnect the L12 ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE MAIN BODY ECU
OK -- REPLACE AUTOMATIC LIGHT CONTROL SENSOR
4. READ VALUE USING TECHSTREAM (HEADLIGHT DIMMER SWITCH)
(a) Using the Techstream, read the Data List.

Combination Switch





OK:
Condition sign can be displayed.
NG -- REPLACE MAIN BODY ECU
OK -- Continue to next step.

5. CHECK WINDSHIELD WIPER SWITCH (OPERATION)
(a) Temporarily replace the windshield wiper switch with a new or normally functioning one Removal.
(b) Check the windshield wiper switch operation.
OK:
Windshield wiper switch operation is normal.
NG -- REPLACE MAIN BODY ECU
OK -- REPLACE WINDSHIELD WIPER SWITCH