Toyota Tundra Service Manual: Automatic High Beam System does not Operate or Operation Indicator does not Illuminate

DESCRIPTION

The main body ECU (multiplex network 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.

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PROCEDURE

(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 illuminate.

NG

GO TO STEP 4

OK

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

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(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

NG

REPLACE FORWARD RECOGNITION CAMERA

OK

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

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(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

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE FORWARD RECOGNITION CAMERA

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

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OK:

Normal condition listed above is displayed.

NG

GO TO STEP 7

OK

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

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OK:

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

NG

REPLACE FORWARD RECOGNITION CAMERA

OK

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

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OK:

Automatic high beam indicator light illuminate.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE COMBINATION METER ASSEMBLY

(a) Remove the auto high beam switch.

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(b) Inspect the auto high beam switch.

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NG

REPLACE AUTO HIGH BEAM SWITCH

OK

(a) Disconnect the J170 automatic high beam main switch connector.

(b) Disconnect the J165 main body ECU (multiplex network body ECU) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR