Solar Sensor Circuit (Driver Side) - Air Conditioning System

AIR CONDITIONING: AIR CONDITIONING SYSTEM: 24: Solar Sensor Circuit (Driver Side)

DTC 24 - Solar Sensor Circuit (Driver Side)

DESCRIPTION

A photodiode in the solar sensor detects solar radiation and sends signals to the A/C amplifier.





HINT: This DTC is indicated only for limited grade (right/left independent temperature control system).





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT: If the check is performed in a dark place, DTC 21, 24 (solar sensor circuit abnormal) may be output.

PROCEDURE

1. INSPECT AIR CONDITIONING AMPLIFIER (TS, S5)




(a) Remove the A/C amplifier with the connectors still connected.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:





HINT:
- Use an incandescent light for inspection. Bring it within 30 cm (11.8 in.) of the cooler (solar sensor) thermistor.
- Move the light away from the sensor voltage increases
- Move the light closer to the sensor voltage decreases

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG -- Continue to next step.

2. INSPECT COOLER (SOLAR SENSOR) THERMISTOR




(a) Remove the cooler (solar sensor) thermistor.
(b) Measure the resistance according to the value(s) in the table below.
(c) Connect the positive (+) lead from the ohmmeter to terminal 3 and the negative (-) lead to terminal 1 of the cooler (solar sensor) thermistor.
Standard resistance:





NOTE: The connection procedure for using a digital tester such as an electrical tester is shown above. When using an analog tester, connect the negative (-) lead to terminal 3 and positive (+) lead to terminal 1 of the cooler (solar sensor) thermistor.

HINT:
- As the inspection light is moved away from the sensor, the resistance increases.
- Use an incandescent light for inspection. Bring it within 30 cm (11.8 in.) of the cooler (solar sensor) thermistor.

NG -- REPLACE COOLER (SOLAR SENSOR) THERMISTOR
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (COOLER (SOLAR SENSOR) - AIR CONDITIONING AMPLIFIER)
(a) Check for open and short circuit in the harness and the connector between the cooler (solar sensor) thermistor and the air conditioning amplifier Electronic Circuit Inspection Procedure.

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

4. CHECK DTC
(a) Start up the DTC check mode.
(b) Check that DTC 24 is not output again.
Result:





B -- SYSTEM IS OK
A -- REPLACE AIR CONDITIONING AMPLIFIER