Toyota Prius: Solar Sensor

Toyota Prius (XW60) 2023-2025 Service Manual / Vehicle Interior / Heating / Air Conditioning / Solar Sensor

On-vehicle Inspection
Removal
Installation

On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT AUTOMATIC LIGHT CONTROL SENSOR (w/ Automatic Light Control System)

Pre-procedure1

(a) Disconnect the G1 automatic light control sensor connector.

Procedure1

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

Standard Voltage:

Click Location & Routing(G1) Click Connector(G1)

Tester Connection	Condition	Specified Condition	Result
G1-1 (CLTB) - G1-2 (CLTE)	Ignition switch off	Below 1 V	V
G1-1 (CLTB) - G1-2 (CLTE)	Ignition switch on (IG)	11 to 14 V	V

Standard Resistance:

Click Location & Routing(G1) Click Connector(G1)

Tester Connection	Condition	Specified Condition	Result
G1-2 (CLTE) - Body ground	Always	Below 1 Ω	Ω

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

Post-procedure1

Procedure2

(d) Connect an oscilloscope to terminals G1-2 (CLTE) and G1-4 (CLTS) of the automatic light control sensor connector and check the waveform.

Component with harness connected

(Automatic Light Control Sensor)

Waveform

OK:

Click Location & Routing(G1) Click Connector(G1)

Tester Connection	Condition	Tool Setting	Specified Condition
G1-2 (CLTE) - G1-4 (CLTS)	Ignition switch on (IG)	2 V/DIV., 10 ms./DIV.	Pulse generation (See waveform)

Tester Connection

Condition

Tool Setting

Specified Condition

G1-2 (CLTE) - G1-4 (CLTS)

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.

2. INSPECT COOLER (SOLAR SENSOR) THERMISTOR (w/o Automatic Light Control System)

(a) Check the wire harness.

(1) Disconnect the G2 cooler (solar sensor) thermistor connector.

(2) Disconnect the K73 air conditioning amplifier assembly connector.

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

Standard Resistance:

Click Location & Routing(G2,K73) Click Connector(G2) Click Connector(K73)

Tester Connection	Condition	Specified Condition	Result
G2-1 - K73-2 (S5-1)	Always	Below 1 Ω	Ω
G2-2 - K73-9 (TS)	Always	Below 1 Ω	Ω
G2-1 - Body ground	Always	10 kΩ or higher	kΩ
G2-2 - Body ground	Always	10 kΩ or higher	kΩ

If the resistance is not as specified, repair the wire harness.

(4) Reconnect the K73 air conditioning amplifier assembly connector.

(5) Turn the ignition switch on (IG).

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

Standard Voltage:

Click Location & Routing(G2) Click Connector(G2)

Tester Connection	Condition	Specified Condition	Result
G2-1 - G2-2	Ignition switch off	Below 1 V	V
G2-1 - G2-2	Ignition switch on (IG)	4.5 to 5.5 V	V

If the voltage is not as specified, replace the air conditioning amplifier assembly.

(b) Check the cooler (solar sensor) thermistor.

(1) Reconnect the G2 cooler (solar sensor) thermistor connector.

(2) Turn the ignition switch on (IG).

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

Standard Voltage:

Tester Connection	Condition	Specified Condition	Result
1 - 2	Sensor subjected to electric light	0.8 to 4.3 V	V
1 - 2	Sensor covered with cloth	Below 0.8 V	V

NOTICE:

The connection procedure for using a digital tester such as a TOYOTA electrical tester is shown above. When using an analog tester, connect the negative (-) lead to terminal 1 and the positive ( ) lead to terminal 2 of the cooler (solar sensor) thermistor.
Do not bring the positive and negative tester probes too close to each other as a short circuit may occur.

HINT:

Use an incandescent light for inspection. Bring it within about 30 cm (11.8 in.) of the cooler (solar sensor) thermistor.
As the inspection light is moved away from the sensor, the voltage decreases.
Check from the rear of the connector while it is connected to the cooler (solar sensor) thermistor.

If the voltage is not as specified, replace the cooler (solar sensor) thermistor.

*a	Component with harness connected (Cooler (Solar Sensor) Thermistor)

Removal

REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during solar sensor removal/installation are shown below.

CAUTION:

Be sure to read Precaution thoroughly before servicing.

Click here

NOTICE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

Click here

HINT:

When the cable is disconnected / reconnected to the auxiliary battery terminal, systems temporarily stop operating. However, each system has a function that completes learning the first time the system is used.

Learning completes when Toyota Prius vehicle is driven

Effect/Inoperative Function When Necessary Procedures are not Performed	Necessary Procedures	Link
Front Camera System	Drive the Toyota Prius vehicle straight ahead at 35 km/h (22 mph) or more for 5 seconds or more.

Learning completes when vehicle is operated normally

Effect/Inoperative Function When Necessary Procedures are not Performed	Necessary Procedures	Link
1: w/o Power Back Door System 2: w/ Power Back Door System
Power Door Lock Control System*1 Back door opener	Perform door unlock operation with door control switch or electrical key transmitter sub-assembly switch.
Power Back Door System*2	Reset back door close position
Air Conditioning System	After the ignition switch is turned to ON, the servo motor standard position is recognized.	-