AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System), Diagnostic DTC:B1429/29

DESCRIPTION

The air duct temperature sensor RH*1 or LH*2 (for front passenger side) detects the duct temperature and sends the appropriate signals to the air conditioning amplifier assembly.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER (AIR DUCT TEMPERATURE SENSOR)

   
   

   1. Use the Data List to check if the air duct temperature sensor RH*1 or LH*2 (for front passenger side) is functioning properly.

      Air Conditioner

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Foot Duct Sensor (Rear P)	Min.: -12.7°C (9.14°F) Max.: 76.55°C (169.79°F)	Actual air duct temperature sensor (for passenger side) displayed	Open in the circuit: -12.7°C (9.14°F) Short in the circuit: 76.55°C (169.79°F)

      Tech Tips

      *1: for LHD

      *2: for RHD

      OK
      The display is as specified in the normal condition.

   
   

   NG

   CHECK AIR DUCT TEMPERATURE SENSOR Click here

   OK

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

2. CHECK AIR DUCT TEMPERATURE SENSOR

   

   
   

   1. for LHD

      
      

      1. Remove the air duct temperature sensor RH Click here.

   2. for RHD

      
      

      1. Remove the air duct temperature sensor LH Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 1 (+) - 2 (-) at 10°C (50°F) 9.4 to 10.5 kΩ at 15°C (59°F) 7.5 to 8.3 kΩ at 20°C (68°F) 6.0 to 6.5 kΩ at 25°C (77°F) 4.5 to 5.2 kΩ at 30°C (86°F) 3.8 to 4.2 kΩ at 35°C (95°F) 3.1 to 3.4 kΩ at 40°C (104°F) 2.5 to 2.8 kΩ at 45°C (113°F) 2.0 to 2.3 kΩ at 50°C (122°F) 1.6 to 2.0 kΩ at 55°C (131°F) 1.3 to 1.6 kΩ at 60°C (140°F) 1.1 to 1.4 kΩ

      Note

      
      

      • Touching the sensor even slightly may change the resistance value. Hold the connector of the sensor.

      • When measuring the resistance, the sensor temperature must be the same as the ambient temperature.

      Tech Tips

      As the temperature increases, the resistance decreases (see the graph).

      If the resistance value is not as specified, replace the sensor.

      Result

      Result	Proceed to
      OK	A
      NG (for LHD)	B
      NG (for RHD)	C

   
   

   B

   REPLACE AIR DUCT TEMPERATURE SENSOR RH Click here

   C

   REPLACE AIR DUCT TEMPERATURE SENSOR LH Click here

   A

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

   

   
   

   1. for LHD

      
      

      1. Disconnect the L12 sensor connector.

      2. Disconnect the E35 amplifier connector.

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

         Standard Resistance
         Tester Connection Condition Specified Condition E35-26 (TR4) - L12-1 (+) Always Below 1 Ω E35-12 (SG-9) - L12-2 (-) E35-26 (TR4) - Body ground Always 10 kΩ or higher E35-12 (SG-9) - Body ground

   2. 

      for RHD

      
      

      1. Disconnect the K21 sensor connector.

      2. Disconnect the E35 amplifier connector.

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

         Standard Resistance
         Tester Connection Condition Specified Condition E35-25 (TR3) - K21-1 (+) Always Below 1 Ω E35-34 (SGND) - K21-2 (-) E35-25 (TR3) - Body ground Always 10 kΩ or higher E35-34 (SGND) - Body ground

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here