Toyota Yaris: Solar Sensor / On-vehicle Inspection

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Heating / Air Conditioning / Solar Sensor / On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT AUTOMATIC LIGHT CONTROL SENSOR

(a) Check the wire harness.

(1) Disconnect the automatic light control sensor.

(2) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

H78-1 (CLTB) - H78-2 (CLTE)

Ignition switch on (IG)

11 to 14 V

If the specified condition is not met, replace the vehicle wire harness.

*a

Front view of wire harness connector

(Automatic Light Control Sensor)

(b) Check the resistance.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

H78-2 (CLTE) - Body ground

Always

Below 1 Ω

If the specified condition is not met, replace the vehicle wire harness.

*a

Front view of wire harness connector

(Automatic Light Control Sensor)

(c) Check the automatic light control sensor.

(1) Connect the automatic light control sensor.

(2) Check the waveform. Use the oscilloscope and check the waveform in the terminal spaces.

NOTICE:

With the connector connected as is, check from the rear side of the connector.

*a

Component with harness connected

(Automatic Light Control Sensor)

*b

Waveform

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

H78-4 (CLTS) - H78-2 (CLTE)

Ignition switch on (IG)

2 V/DIV.,10 ms/DIV.

Pulse generation

(See waveform)

HINT:

The communication waveform changes according to the surrounding brightness.

If the result is not as specified, the automatic light control sensor may be malfunctioning.

    Components

    C..

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