B1421

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1421/21: Solar Sensor Circuit (Passenger Side)
B1421/21 - Solar Sensor Circuit (Passenger Side)

DESCRIPTION

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 sunlight increases, the output current increases. As the sunlight decreases, the output current decreases. The air conditioning amplifier detects output current from the solar sensor.

HINT
If DTC B1244 is output at the same time, troubleshoot DTC B1244 first.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (SOLAR SENSOR (for Passenger Side))

(a) Use the Data List to check if the passenger side solar sensor is functioning properly.

Air conditioner

OK:

The display is as specified in the normal condition.

NG -- CHECK HARNESS AND CONNECTOR (SOLAR SENSOR)

OK -- REPLACE AIR CONDITIONING AMPLIFIER Removal

2. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR)

(a) Disconnect the M2 solar sensor connector.

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

Standard resistance:

NG -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SOLAR SENSOR AND BODY GROUND)
OK -- Continue to next step.

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

(a) Disconnect the M2 solar sensor connector.

(b) Disconnect the L77 air conditioning amplifier connector.

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

Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK SOLAR SENSOR (TSR - CLTE VOLTAGE)

(a) Remove the solar sensor with its connector still connected Removal.

(b) Apply battery voltage between terminals 6 (CLTB) and 3 (CLTE) of the solar sensor.

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

Standard voltage:

HINT
* As the inspection light is moved away from the sensor, the voltage decreases.
* Use an incandescent light for inspection. Bring it about 30 cm (11.8 in.) from the solar sensor.

NG -- REPLACE AUTOMATIC LIGHT CONTROL SENSOR Removal

OK -- REPLACE AIR CONDITIONING AMPLIFIER Removal

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

(a) Disconnect the L12 and DA main body ECU connectors.

(b) Disconnect the M2 solar sensor connector.

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

Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU