Automatic High Beam Switch Circuit [02/2017 - 09/2019]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Data List.
5. Read the Data List according to the display on the Techstream.

   Body Electrical > Main Body > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Auto High Beam Main Switch	Auto high beam switch signal	ON or OFF	ON: Auto high beam switch pressed OFF: Auto high beam switch not pressed	-

   Body Electrical > Main Body > Data List 

   Tester Display
   Auto High Beam Main Switch

   OK

   Normal conditions listed above are displayed.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [02/2017 - 09/2019] 

Result: 

NG 

See step  2

1. Remove the auto high beam switch.

   Refer to REMOVAL [02/2017 - ]

2. Inspect the auto high beam switch.

   Refer to INSPECTION [02/2017 - ]

   OK

   Auto high beam switch is normal.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE AUTO HIGH BEAM SWITCH. Refer to  REMOVAL [02/2017 - ] 

Result: 

OK 

See step  3

1. Disconnect the F15 main body ECU (multiplex network body ECU) connector.
2. Measure the resistance according to the value(s) in the chart below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F6-6 (+B) - F15-17 (AHBI)	Always	Below 1 Ω
   F6-6 (+B) or F15-17 (AHBI) - Body ground	Always	10 kΩ or higher
   F6-3 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [02/2017 - 10/2017]  , or refer to  REMOVAL [10/2017 - 08/2020] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR