Automatic High Beam System does not Operate or Operation Indicator does not Illuminate [09/2017 - 05/2019]: Procedure

1. Check the operation of the automatic high beam indicator light.
   • Turn the power switch on (IG).
   • Turn the light control switch to the Auto or Head position.
   • Turn the headlight dimmer switch to the High position.
   • Turn the combination switch assembly (automatic high beam main switch) on.

   OK

   Automatic high beam indicator light illuminate.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  4

Result: 

OK 

See step  2

1. Using the Techstream, read the Data List.

   Refer to DATA LIST / ACTIVE TEST [09/2017 - 05/2019]

   1. Shine a light on the automatic high beam sensor*.

      HINT: 

      *: If troubleshooting is being performed in a bright area, such as outside on a sunny day, it will not be necessary to perform this step.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *1	Forward Recognition Camera (Automatic High Beam Sensor)
      *2	Work Light or Equivalent
      *a	100 mm (3.94 in.) or less

      Body Electrical > Main Body > Data List 

      Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
      Auto H Beam STS0	Automatic high beam sensor state past 0	Undetec, CAM NA, No sens, Hlight, Taillgt, Speed, Daytime, Village, Malfunc, Delay, Aim Lmt, SAE Mod, Undefin or LIN Err	Condition can be displayed	-

      Body Electrical > Main Body > Data List 

      Tester Display
      Auto H Beam STS0

      OK

      The Data List value displays "Daytime".

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [09/2017 - 05/2019] 

Result: 

OK 

See step  3

1. Using the Techstream, read the Data List.

   Refer to DATA LIST / ACTIVE TEST [09/2017 - 05/2019]

   1. Cover the automatic high beam sensor with an opaque object, such as cardboard.
      NOTE:

      • Make sure that there is no clearance between the cardboard or equivalent object and the area of the windshield glass in front of the automatic high beam sensor.
      • If there is any clearance, light may shine on the automatic high beam sensor and the value of the Data List will not change.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *1	Cardboard or Equivalent Object
      *a	150 mm (5.91 in.) or higher
      *b	3 mm (0.118 in.) or higher

      Body Electrical > Main Body > Data List 

      Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
      Auto H Beam STS0	Automatic high beam sensor state past 0	Undetec, CAM NA, No sens, Hlight, Taillgt, Speed, Daytime, Village, Malfunc, Delay, Aim Lmt, SAE Mod, Undefin or LIN Err	Condition can be displayed	-

      Body Electrical > Main Body > Data List 

      Tester Display
      Auto H Beam STS0

      OK

      The Data List value displays "Speed".

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2017 - 05/2019] 

Result: 

NG 

REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [09/2017 - 05/2019] 

1. Using the Techstream, read the Data List.

   Refer to DATA LIST / ACTIVE TEST [09/2017 - 05/2019]

   Body Electrical > Main Body > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Auto High Beam Main Switch	Combination switch assembly (automatic high beam main switch) signal	OFF or ON	OFF: Combination switch assembly (automatic high beam main switch) off ON: Combination switch assembly (automatic high beam main switch) on	-

   Body Electrical > Main Body > Data List 

   Tester Display
   Auto High Beam Main Switch

   OK

   Normal condition listed above is displayed.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  7

Result: 

OK 

See step  5

1. Using the Techstream, read the Data List.

   Refer to DATA LIST / ACTIVE TEST [09/2017 - 05/2019]

   Body Electrical > Main Body > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Auto H Beam STS0	Automatic high beam sensor state past 0	Undetec, CAM NA, No sens, Hlight, Taillgt, Speed, Daytime, Village, Malfunc, Delay, Aim Lmt, SAE Mod, Undefin or LIN Err	Condition can be displayed	-

   Body Electrical > Main Body > Data List 

   Tester Display
   Auto H Beam STS0

   OK

   The Data List value displays "Daytime" or "Speed".

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [09/2017 - 05/2019] 

Result: 

OK 

See step  6

1. Perform the Active Test according to the display on the Techstream.

   Refer to DATA LIST / ACTIVE TEST [09/2017 - 05/2019]

   Body Electrical > Combination Meter > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Automatic High Beam Indicator	Automatic high beam indicator light	OFF or ON	-

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Automatic High Beam Indicator

   OK

   Automatic high beam indicator light illuminate.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [10/2014 - 05/2019] 

Result: 

NG 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2017 - ] 

1. Remove the combination switch assembly (automatic high beam main switch).

   Refer to REMOVAL [10/2014 - ]

2. Inspect the combination switch assembly (automatic high beam main switch).

   Refer to INSPECTION [10/2014 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE COMBINATION SWITCH ASSEMBLY (AUTOMATIC HIGH BEAM MAIN SWITCH). Refer to  REMOVAL [10/2014 - ] 

Result: 

OK 

See step  8

1. Disconnect the I33 combination switch assembly (automatic high beam main switch) connector.
2. Disconnect the I47 main body ECU (multiplex network body ECU) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I33-1 (+B) - I47-23 (AHBI)	Always	Below 1 Ω
   I33-10 (E) - Body ground	Always	Below 1 Ω
   I33-1 (+B) or I47-23 (AHBI) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [10/2014 - 05/2019] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR