LIGHTING (EXT): LIGHTING SYSTEM: Automatic High Beam System does not Operate or Operation Indicator does not Illuminate; 2018 - 2020 MY Sienna [11/2017

Last Modified: 04-05-2023	6.11:8.1.0	Doc ID: RM1000000018ZK7
Model Year Start: 2018	Model: Sienna	Prod Date Range: [11/2017 - ]
Title: LIGHTING (EXT): LIGHTING SYSTEM: Automatic High Beam System does not Operate or Operation Indicator does not Illuminate; 2018 - 2020 MY Sienna [11/2017 - ]

Automatic High Beam System does not Operate or Operation Indicator does not Illuminate

DESCRIPTION

The main body ECU controls the automatic high beam system based on signals received from the forward recognition camera.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
If the forward recognition camera has been replaced with a new one, be sure to perform Forward Recognition Camera Learning.
Click here

PROCEDURE

1.	CHECK AUTOMATIC HIGH BEAM INDICATOR LIGHT

(a) Check the operation of the automatic high beam indicator light.

Turn the ignition switch to ON.
Turn the light control switch to the Auto or Head position.
Turn the headlight dimmer switch to the High position.
Turn the automatic high beam main switch on.

OK:

Automatic high beam indicator light illuminates.

GO TO STEP 4

2.	READ VALUE USING TECHSTREAM

(a) Using the Techstream, read the Data List.

Click here

(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.

Main Body

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, LIN Err	Condition can be displayed	-

OK:

The Data List value displays "Daytime".

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

REPLACE FORWARD RECOGNITION CAMERA

3.	READ VALUE USING TECHSTREAM

(a) Using the Techstream, read the Data List.

Click here

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

NOTICE:

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.

Main Body

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, LIN Err	Condition can be displayed	-

OK:

The Data List value displays "Speed".

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

USE SIMULATION METHOD TO CHECK

REPLACE FORWARD RECOGNITION CAMERA

4.	READ VALUE USING TECHSTREAM

(a) Using the Techstream, read the Data List.

Click here

Main Body

Tester Display

Measurement Item / Range

Normal Condition

Diagnostic Note

Dimmer SW

Dimmer switch high position signal/ON or OFF

ON: Dimmer switch in high or high flash (pass) position

OFF: Dimmer switch in low position

Auto Light SW

Light control switch AUTO position signal/ON or OFF

ON: Light control switch in AUTO position

OFF: Light control switch not in AUTO position

OK:

Normal conditions listed above are displayed.

GO TO STEP 7

5.	READ VALUE USING TECHSTREAM

(a) Using the Techstream, read the Data List.

Click here

Main Body

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, LIN Err	Condition can be displayed	-

OK:

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

REPLACE FORWARD RECOGNITION CAMERA

6.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Using the Techstream, perform the Active Test.

Click here

Combination Meter

Tester Display	Test Part	Control Range	Diagnostic Note
Automatic High Beam Indicator	Automatic high beam indicator light	OFF or ON	Operate with IG ON and the vehicle is stopped.

OK:

Automatic high beam indicator light illuminates.

REPLACE MAIN BODY ECU

REPLACE COMBINATION METER ASSEMBLY

7.	INSPECT HEADLAMP DIMMER SWITCH ASSEMBLY

(a) Remove the headlight dimmer switch assembly.

Click here

(b) Inspect the headlight dimmer switch assembly.

Click here

REPLACE HEADLAMP DIMMER SWITCH ASSEMBLY

8.	CHECK HARNESS AND CONNECTOR (AUTOMATIC HIGH BEAM MAIN SWITCH - MAIN BODY ECU AND BODY GROUND)

(a) Disconnect the D147 headlight dimmer switch assembly connector.

(b) Disconnect the D13 main body ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D147-19 (A) - D13-28 (A)	Always	Below 1 Ω
D147-11 (HU) - D13-5 (HU)	Always	Below 1 Ω
D147-12 (EL) - Body ground	Always	Below 1 Ω
D147-19 (A) or D13-5 (HU) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR