Automatic High Beam System does not Operate or Operation Indicator does not Illuminate [11/2024 - ]: Procedure

1. Check for vehicle control history.

   Body Electrical > Front Recognition Camera (Front Lighting Control) > Utility 

   Tester Display
   Vehicle Control History (RoB)

   Result

   Result	Proceed to
   X204E is not output	A
   X204E is output	B

Result: 

B 

GO TO VEHICLE CONTROL HISTORY 

Refer to VEHICLE CONTROL HISTORY [11/2024 - ] 

Result: 

A 

See step  2

1. Enter the following menus: Chassis / Front Recognition Camera / Data List.
2. Read the Data List according to the display on the Techstream.

   Chassis > Front Recognition Camera > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Front Recognition Camera High Temperature 2	Forward recognition camera condition	Not High Temperature or High Temperature	Not High Temperature: 65°C (149°F) or lower High Temperature: 65°C (149°F) or higher	If this item is "High Temperature", the automatic high beam system will be temporarily unavailable. If this does not improve even if the inside of the vehicle is left cooled for at least 10 minutes, the forward recognition camera may be malfunctioning. HINT:  In summertime, the windshield glass may reach 100°C (212°F) or higher

   Chassis > Front Recognition Camera > Data List 

   Tester Display
   Front Recognition Camera High Temperature 2

   OK

   "Not High Temperature" is displayed on the Techstream.

   HINT: 

   If "High Temperature" is displayed, move the vehicle to a cool place and allow the temperature of the forward recognition camera to decrease before continuing with troubleshooting.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

END (THE SYSTEM STOPPED OPERATING DUE TO HIGH TEMPERATURES) 

Result: 

OK 

See step  3

1. Check the operation of the automatic high beam indicator light.
   1. Turn the ignition switch to ON.
   2. Turn the light control switch to the AUTO or HEAD position.
   3. Cover the automatic light control sensor to turn the low beam headlights on.
   4. Move the dimmer switch to the high position.
   5. Press the auto high beam switch.

   Result

   Result	Proceed to
   OK (The automatic high beam indicator light and the auto high beam switch indicator illuminate)	A
   NG (Automatic high beam indicator light does not illuminate)	B
   NG (Automatic high beam indicator light and auto high beam switch indicator do not operate)	C

Result: 

B 

See step  5

Result: 

C 

See step  6

Result: 

A 

See step  4

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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.
2. Enter the following menus: Body Electrical / Main Body / Data List.
3. Read the Data List according to the display on the Techstream.

   HINT: 

   As it may take time for the values in the Data List to change, wait at least 10 seconds before reading the Data List.

   Body Electrical > Main Body > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Automatic High Beam Sensor	Automatic high beam sensor current state	Undetec, Can't Detect, No sens, Headlight, Taillight, Speed, Daytime, Village, Other, Delay, Aim Limit, SAE, Optical axis, LIN Err	Condition can be displayed*	If the value of this item is not as specified, the automatic high beam sensor system may be malfunctioning.

   Body Electrical > Main Body > Data List 

   Tester Display
   Automatic High Beam Sensor

   OK

   "Speed" is displayed on the Techstream.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ]

Result: 

NG 

REPLACE FORWARD RECOGNITION CAMERA 

Refer to REMOVAL [12/2021 - ]

1. Enter the following menus: Body Electrical / Combination Meter / Active Test.
2. Perform the Active Test according to the display on the Techstream.

   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

   The automatic high beam indicator illuminates and turns off.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

Refer to REMOVAL [10/2023 - ]

Result: 

NG 

REPLACE COMBINATION METER ASSEMBLY 

Refer to REMOVAL [10/2022 - ]

1. Enter the following menus: Body Electrical / Main Body / Data List.
2. 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	OFF or ON	OFF: Auto high beam switch not pressed ON: Auto high beam switch 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: 

NG 

See step  9

Result: 

OK 

See step  7

1. Enter the following menus: Body Electrical / Main Body / Data List.
2. 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
   Automatic High Beam Sensor	Automatic high beam sensor current state	Undetec, Can't Detect, No sens, Headlight, Taillight, Speed, Daytime, Village, Other, Delay, Aim Limit, SAE, Optical axis, LIN Err	Condition can be displayed*	If the value of this item is not as specified, the automatic high beam sensor system may be malfunctioning.

   Body Electrical > Main Body > Data List 

   Tester Display
   Automatic High Beam Sensor

   OK

   "Daytime" or "Speed" is displayed on the Techstream.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE FORWARD RECOGNITION CAMERA 

Refer to REMOVAL [12/2021 - ]

Result: 

OK 

See step  8

1. Enter the following menus: Body Electrical / Combination Meter / Active Test.
2. Perform the Active Test according to the display on the Techstream.

   OK

   The automatic high beam indicator illuminates and turns off.

   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

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

Refer to REMOVAL [10/2023 - ]

Result: 

NG 

REPLACE COMBINATION METER ASSEMBLY 

Refer to REMOVAL [10/2022 - ]

1. Remoce the auto high beam switch.

   Refer to REMOVAL [11/2018 - ]

2. Inspect the auto high beam switch.

   Refer to INSPECTION [11/2018 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE AUTO HIGH BEAM SWITCH 

Refer to REMOVAL [11/2018 - ]

Result: 

OK 

See step  10

1. Disconnect the G44 main body ECU (multiplex network body ECU) connector.
2. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G42-5 (+B) - G44-26 (AHBI)	Always	Below 1 Ω
   G42-5 (+B) or G44-26 (AHBI) - Body ground	Always	10 kΩ or higher
   G42-2 (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 [10/2023 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR