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.

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Lane Departure Alert System (w/ Steering Control)(for Hv Model): Front Radar Sensor (C1A10)
DESCRIPTION The forward recognition camera uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle. When the forward recognition camera receives information that there is an internal malfunction in the millimeter wave radar sensor assembly, DTC C1A10 is stored. DTC ...

Toyota Avalon (XX50) 2019-2022 Owners Manual