AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System), Diagnostic DTC:B1421/21

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   READ VALUE USING INTELLIGENT TESTER (SOLAR SENS-P)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch on (IG) and turn the intelligent tester main switch on.

   3. Select the item below in the Data List, and read the value displayed on the intelligent tester.

      Table 1. Data List / Air Conditioner:

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Solar Sens-P	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 Proceed to NG A OK (Checking from PROBLEM SYMPTOMS TABLE) B OK (Checking from DTC) C

   
   
   • AClick here
   • BClick here
   • CClick here
2. Click here

   CHECK SOLAR SENSOR (SENSOR POWER INPUT)

   
   
   1. 

      Disconnect the F1 solar sensor connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition F1-6 (CLTB) - F1-3 (CLTE) Ignition switch off Below 1 V F1-6 (CLTB) - F1-3 (CLTE) Ignition switch on (IG) 11 to 14 V

   
   
   • NGClick here
   • OKClick here
3. Click here

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

   
   
   1. 

      Disconnect the D6 main body ECU connector.

   2. Disconnect the F1 solar sensor connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition D6-20 (CLTB) - F1-6 (CLTB) Always Below 1 Ω D6-18 (CLTE) - F1-3 (CLTE) Always Below 1 Ω D-20 (CLTB) - Body ground Always 10 kΩ or higher D6-18 (CLTE) - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK SOLAR SENSOR

   
   
   1. 

      Remove the solar sensor (Click here) with its connector still connected.

   2. Connect the battery's positive (+) lead to terminal 6 (CLTB) and the negative (-) lead to terminal 3 (CLTE) of the solar sensor.

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

      Standard voltage
      Tester Connection Condition Specified Condition F1-2 (TSR) - F1-3 (CLTE) Sensor is subjected to electric light 0.8 to 4.3 V F1-2 (TSR) - F1-3 (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 6 and positive (+) lead to terminal 3 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.

      Tip:
      

      • 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 decreases.

   
   
   • OKClick here
   • NGClick here
5. Click here

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

   
   
   1. 

      Disconnect the F1 solar sensor connector.

   2. Disconnect the D37 air conditioning amplifier connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition D373-32 (TSP) - F1-2 (TSR) Always Below 1 Ω D33-32 (TSP) - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
6. Click here

   REPLACE AIR CONDITIONING AMPLIFIERClick here

7. Click here

   REPLACE SOLAR SENSORClick here

8. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR

9. Click here

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLEClick here

10. Click here

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)