Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT AUTOMATIC LIGHT CONTROL SENSOR

(a) Disconnect the G23 automatic light control sensor connector.

*a	Front view of wire harness connector (to Automatic Light Control Sensor)

(b) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
1: for HV Model 2: for Gasoline Model
G23-1 (CLTB) - G23-2 (CLTE)	Power switch off*1	Below 1 V
	Engine switch off*2	Below 1 V
	Power switch on (IG)*1	11 to 14 V
	Engine switch on (IG)*2	11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
G23-2 (CLTE) - Body ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction on the wire harness side.

(d) Connect an oscilloscope to terminals G23-2 (CLTE) and G23-4 (CLTS) of the automatic light control sensor connector and check the waveform.

Component with harness connected

(Automatic Light Control Sensor)

Waveform

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

*1: for HV Model

*2: for Gasoline Model

G23-2 (CLTE) - G23-4 (CLTS)

Power switch on (IG)*1

2 V/DIV., 10 ms./DIV.

Pulse generation

(See waveform)

Engine switch on (IG)*2

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.

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Toyota Avalon (XX50) 2019-2022 Owners Manual