Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

READ VALUE USING TECHSTREAM

Connect the Techstream to the DLC3
Turn the engine switch on (IG)
Turn the Techstream on

Select the item below in the Data List, and read the value displayed on the Techstream.

Data List / Air Conditioner

DATA LIST / AIR CONDITIONER

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Solar Sensor (P Side)	Passenger side solar sensor / Min 0, Max 255	Passenger side solar sensor value increases as brightness increases	-

OK: The display is as specified in the normal condition column.

Result

RESULT DESCRIPTION

Result	Proceed to
NG	A
OK (When troubleshooting according to the Problem Symptoms Table)	B
OK (When troubleshooting according to the DTC)	C

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )

C: REPLACE A/C AMPLIFIER (See REMOVAL )

A: Go to next step

CHECK SOLAR SENSOR (SENSOR POWER INPUT)

Disconnect the solar sensor connector.

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

Standard Voltage

STANDARD VOLTAGE SPECIFICATIONS

Tester Connection	Condition	Specified Condition
K1-6 (CLTB) - K1-3 (CLTE)	Engine switch off	Below 1 V
K1-6 (CLTB) - K1-3 (CLTE)	Engine switch on (IG)	11 to 14 V

Fig 1: Identifying K1 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 5

OK: Go to next step

INSPECT SOLAR SENSOR

Remove the solar sensor.
Reconnect the solar sensor connector.
Turn the engine switch on (IG).

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

Fig 2: Identifying Solar Sensor Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Voltage

STANDARD VOLTAGE SPECIFICATIONS

Tester Connection	Condition	Specified Condition
K1-2 (TSR) - K1-3 (CLTE)	Sensor is subjected to electric light	0.8 to 4.3 V
K1-2 (TSR) - K1-3 (CLTE)	Sensor is covered with a cloth	Below 0.8 V

NOTE:

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 2 and positive (+) lead to terminal 6 of the solar sensor.
While using the battery during inspection, 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 solar sensor
As the inspection light is moved away from the sensor, the voltage increases.

NG: REPLACE SOLAR SENSOR (See REMOVAL )

OK: Go to next step

CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - A/C AMPLIFIER)

Disconnect the solar sensor connector

Fig 3: Identifying K1 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the A/C amplifier connector.

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

Standard Resistance

STANDARD RESISTANCE SPECIFICATIONS

Tester Connection	Condition	Specified Condition
J58-14 (TSP) - K1-2 (TSR)	Always	Below 1 Ω
J58-14 (TSP) - Body ground	Always	10 kΩ or higher

Fig 4: Identifying J58 Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE A/C AMPLIFIER (See REMOVAL )

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SOLAR SENSOR)

Disconnect the main body ECU connector.

Fig 5: Identifying J74 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

STANDARD RESISTANCE SPECIFICATIONS

Tester Connection	Condition	Specified Condition
J74-6 (CLTB) - K1-6 (CLTB)	Always	Below 1 Ω
J74-4 (CLTE) - K1-3 (CLTE)	Always	Below 1 Ω
J74-6 (CLTB) - Body ground	Always	10 kΩ or higher
J74-4 (CLTE) - Body ground	Always	10 kΩ or higher

Fig 6: Identifying K1 Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK RH)