Automatic High Beam Switch Circuit [11/2015 - 07/2020]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
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	Automatic high beam main switch (No. 2 combination switch assembly) signal	ON or OFF	ON: Automatic high beam main switch (No. 2 combination switch assembly) pressed OFF: Automatic high beam main switch (No. 2 combination switch assembly) not pressed	-

   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 [11/2015 - 12/2018]  , or refer to  PROBLEM SYMPTOMS TABLE [12/2018 - 07/2020] 

Result: 

NG 

See step  2

1. Remove the automatic high beam main switch (No. 2 combination switch assembly).

   Refer to REMOVAL [11/2015 - ]

2. Inspect the automatic high beam main switch (No. 2 combination switch assembly).

   Refer to INSPECTION [11/2015 - ]

   OK

   Automatic high beam main switch is normal.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE AUTOMATIC HIGH BEAM MAIN SWITCH (NO. 2 COMBINATION SWITCH ASSEMBLY). Refer to  REMOVAL [11/2015 - ] 

Result: 

OK 

See step  3

1. Disconnect the F17 main body ECU (multiplex network body ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   (F49, F17)

   (F49)

   (F17)

   Tester Connection	Condition	Specified Condition
   F49-9 (+B) - F17-17 (AHBI)	Always	Below 1 Ω
   F49-9 (+B) or F17-17 (AHBI) - Body ground	Always	10 kΩ or higher
   F49-8 (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 [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 07/2020] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR