Toyota Fortuner. Dtc 21 Solar Sensor Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (TS VOLTAGE)

INSPECT A/C SOLAR SENSOR

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

DTC 21 Solar Sensor Circuit

DESCRIPTION

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).
Dtc
21 Solar Sensor Circuit

The solar sensor, which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning in AUTO mode. The output current from the solar sensor varies according to the amount of sunlight. When the amount of sunlight increases, the output current increases. As the amount of sunlight decreases, the output current decreases. The air conditioning amplifier detects the output current from the solar sensor.

DTC Code	Detection Item	Trouble Area
21	Open or short in solar sensor circuit (If check is performed in a dark place, DTC 21 may be stored)	A/C solar sensor Harness or connector Air conditioning amplifier assembly

WIRING DIAGRAM

INSPECTION PROCEDURE

1.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (TS VOLTAGE)

Remove the air conditioning amplifier with its connectors still connected.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A15-2 (S5-3) - A15-7 (TS)	Ignition switch ON Sensor subjected to electric light	0.8 to 4.3 V
A15-2 (S5-3) - A15-7 (TS)	Ignition switch ON Sensor covered with a cloth	Below 0.8 V

HINT:

As the inspection light is moved away from the sensor, the voltage decreases.
Use an incandescent light for inspection. Bring it within 30 cm (11.8 in.) of the A/C solar sensor.

Go to step 2

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Toyota Fortuner RM0000012KH002X.html)

2.INSPECT A/C SOLAR SENSOR

Remove the solar sensor.

Measure the resistance according to the value(s) in the table below.
1. Connect the ohmmeter's negative (-) lead to terminal 1 and positive (+) lead to terminal 2.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  1 - 2
  Sensor is subjected to electric light
  Below 10 kΩ
  Sensor is covered with a cloth
  10 kΩ or higher
  NOTICE:
  The connection procedure for 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 1.
  HINT:
  1. As the inspection light is moved away from the sensor, the resistance increases.
  2. Use an incandescent light for inspection. Bring it within 30 cm (11.8 in.) of the A/C solar sensor.

REPLACE A/C SOLAR SENSOR (Toyota Fortuner RM000003S0L000X.html)

OK

3.CHECK HARNESS AND CONNECTOR (A/C SOLAR SENSOR - AIR CONDITIONING AMPLIFIER)

Disconnect the A18 sensor connector.

Disconnect the A15 amplifier connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
A15-2 (S5-3) - A18-1
Always
Below 1 Ω
A15-7 (TS) - A18-2
A15-2 (S5-3) - Body ground
Always
10 kΩ or higher
A15-7 (TS) - Body ground

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Toyota Fortuner RM0000012KH002X.html)

Tester Connection	Condition	Specified Condition
1 - 2	Sensor is subjected to electric light	Below 10 kΩ
1 - 2	Sensor is covered with a cloth	10 kΩ or higher