Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Automatic High Beam System does not Operate or Operation Indicator does not Illuminate

Toyota Tacoma 2015-2018 Service Manual / Lighting / Lighting System / 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

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.

NG

GO TO STEP 4

OK

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

NG

REPLACE FORWARD RECOGNITION CAMERA

OK

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

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE FORWARD RECOGNITION CAMERA

4.

READ VALUE USING TECHSTREAM

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

Click here Main Body

Main Body

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 off

ON: Auto high beam switch on

-

OK:

Normal condition listed above is displayed.

NG

GO TO STEP 7

OK

5.

READ VALUE USING TECHSTREAM

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

Click here Main Body

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".

NG

REPLACE FORWARD RECOGNITION CAMERA

OK

6.

PERFORM ACTIVE TEST USING TECHSTREAM

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

Click here Combination Meter

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.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE COMBINATION METER ASSEMBLY

7.

INSPECT AUTO HIGH BEAM SWITCH

(a) Remove the auto high beam switch.

Click here (b) Inspect the auto high beam switch.

(b) Inspect the auto high beam switch.

Click here

NG

REPLACE AUTO HIGH BEAM SWITCH

OK

8.

CHECK HARNESS AND CONNECTOR (AUTO HIGH BEAM SWITCH - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] AND BODY GROUND)

(a) Disconnect the A41 auto high beam switch connector.

(b) Disconnect the M6 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A41-4 (+B) - M6-17 (AHBI)

Always

Below 1 Ω

A41-1 (E) - Body ground

Always

Below 1 Ω

A41-4 (+B) or M6-17 (AHBI) - Body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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