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.
Click here
PROCEDURE
1.
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CHECK AUTOMATIC HIGH BEAM INDICATOR LIGHT
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(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 |
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GO TO STEP 4
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OK |
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2.
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READ VALUE USING TECHSTREAM
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(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
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Measurement Item / Range
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Normal Condition
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Diagnostic Note
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Auto H Beam STS0
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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
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Condition can be displayed
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-
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OK:
The Data List value displays "Daytime".
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*1
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Forward Recognition Camera (Automatic High Beam Sensor)
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*2
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Work Light or Equivalent
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*a
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100 mm (3.94 in.) or less
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NG |
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REPLACE FORWARD RECOGNITION CAMERA
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OK |
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3.
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READ VALUE USING TECHSTREAM
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(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
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Measurement Item / Range
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Normal Condition
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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
|
-
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OK:
The Data List value displays "Speed".
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*1
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Cardboard or Equivalent Object
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*a
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150 mm (5.91 in.) or higher
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*b
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3 mm (0.118 in.) or higher
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OK |
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USE SIMULATION METHOD TO CHECK
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NG |
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REPLACE FORWARD RECOGNITION CAMERA
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4.
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READ VALUE USING TECHSTREAM
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(a) Using the Techstream, read the Data List.
Click here
Main Body
Tester Display
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Measurement Item / Range
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Normal Condition
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Diagnostic Note
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Auto High Beam Main Switch
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Auto high beam switch signal / OFF or ON
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OFF: Auto high beam switch off
ON: Auto high beam switch on
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-
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OK:
Normal condition listed above is displayed.
NG |
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GO TO STEP 7
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OK |
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5.
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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
|
-
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OK:
The Data List value displays "Daytime" or "Speed".
NG |
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REPLACE FORWARD RECOGNITION CAMERA
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OK |
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6.
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PERFORM ACTIVE TEST USING TECHSTREAM
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(a) Using the Techstream, perform the Active Test.
Click here
Combination Meter
Tester Display
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Test Part
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Control Range
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Diagnostic Note
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Automatic High Beam Indicator
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Automatic high beam indicator light
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OFF or ON
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-
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OK:
Automatic high beam indicator light illuminate.
OK |
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REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
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NG |
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REPLACE COMBINATION METER ASSEMBLY
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7.
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INSPECT AUTO HIGH BEAM SWITCH
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(a) Remove the auto high beam switch.
Click here
(b) Inspect the auto high beam switch.
Click here
NG |
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REPLACE AUTO HIGH BEAM SWITCH
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OK |
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8.
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CHECK HARNESS AND CONNECTOR (AUTOMATIC HIGH BEAM MAIN SWITCH - MAIN BODY
ECU [MULTIPLEX NETWORK BODY ECU] AND BODY GROUND)
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(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:
Tester Connection
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Condition
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Specified Condition
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J170-6 (+B) - J165-17 (AHBI)
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Always
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Below 1 Ω
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J170-3 (E) - Body ground
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Always
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Below 1 Ω
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J170-6 (+B) or J165-17 (AHBI) - Body ground
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Always
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10 kΩ or higher
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OK |
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REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
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NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
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