AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B1438/49, B1439/-49, B1443/E49

DESCRIPTION

This sensor detects the position of the air outlet damper and sends appropriate signals to the A/C amplifier assembly.

The position sensor is built into the air outlet control servo motor.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. READ VALUE USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Operate the MODE switch.

   5. Enter the following menus: Body Electrical / Air Conditioner / Data List.

   6. Check the value(s) by referring to the table below.

      Air Conditioner

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Air Outlet Damper Position	Air outlet damper position / Min.: -32.68%, Max.: 133.33%	FACE: -16.7% B/L: 10% FOOT-0: 50% (Manual operation) FOOT/DEF: 90% DEF: 116.7%	-
      Air Outlet Damper Target	Air outlet damper target position / Min.: -32.68%, Max.: 133.33%	FACE: -16.7% B/L: 10% FOOT-0: 50% (Manual operation) FOOT/DEF: 90% DEF: 116.7%	-

      OK
      The display is as specified in the normal condition column.

   
   

   NG

   CHECK HARNESS AND CONNECTOR (NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY - AIR CONDITIONING CONTROL ASSEMBLY) Click here

   OK

2. CHECK FOR DTC

   
   

   1. Clear the DTCs Click here.

   2. Check the DTCs Click here.

      OK
      DTC is not output.

   
   

   OK

   END

   NG

   REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

3. CHECK HARNESS AND CONNECTOR (NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY - AIR CONDITIONING CONTROL ASSEMBLY)

   
   

   1. Disconnect the D20 air conditioning control assembly.

   2. Disconnect the A29 No. 3 air conditioning radiator damper servo sub-assembly (air outlet).

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

      Standard Resistance

      Test Connection Condition Specified Condition A29-1(GND) - D20-6(SG) Always Below 1Ω A29-2(VZ) - D20-13(S5) Always Below 1Ω A29-3(TP) - D20-16(TPO) Always Below 1Ω A29-4(DEF) - D20-19(A0D) Always Below 1Ω A29-5(FACE) - D20-20A0F) Always Below 1Ω A29-1(GND) - Body ground Always 10 kΩ or higher A29-2(VZ) - Body ground Always 10 kΩ or higher A29-3(TP) - Body ground Always 10 kΩ or higher A29-4(DEF) - Body ground Always 10 kΩ or higher A29-5(FACE) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS AND CONNECTOR

   OK

4. INSPECT NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

   
   

   1. Remove the No. 3 air conditioning radiator damper servo sub-assembly (air outlet) Click here.

   2. Potentiometer circuit inspection

      
      

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

         Standard resistance

         Tester Connection	Condition	Specified Condition
         A29-1(GND) - A29-2(VZ)	Always	4.2 to 7.8 kΩ

         

         Text in Illustration

         *a	Component without harness connected (No. 3 air conditioning radiator damper servo sub-assembly)

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

         Standard resistance

         Tester Connection	Condition	Specified Condition
         A29-1(GND) - A29-3(TP)	FACE position	3.4 to 6.2 kΩ
         A29-1(GND) - A29-3(TP)	DEF position	0.8 to 1.6 kΩ

         

         Text in Illustration

         *a	FACE
         *b	DEF

      3. As the arm of the No. 3 air conditioning radiator damper servo motor moves from the FACE side to the DEF side, the resistance decreases gradually without interruption.

         

   3. Motor circuit inspection

      
      

      1. When the terminal 5 (FACE) of the connector A29 is connected to the battery positive terminal, and terminal 4 (DEF) of the connector A29 is connected to the battery negative terminal, confirm that the arm smoothly rotates from DEF to FACE.

         Tech Tips

         Because the arm does not automatically stop at servo unit inspection, at inspection, turn off the power supply near FACE

      2. When the terminal 4 (DEF) of the connector A29 is connected to the battery positive terminal, and terminal 5 (FACE) of the connector A29 is connected to the battery negative terminal, confirm that the arm smoothly rotates from FACE to DEF.

         Tech Tips

         Because the arm does not automatically stop at servo unit inspection, at inspection, turn off the power supply near DEF

   
   

   OK

   REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

   NG

   REPLACE NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here