AIR CONDITIONING SYSTEM, Diagnostic DTC:B1443/43

DESCRIPTION

• for LHD:

  The No. 1 air conditioning radiator damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the air outlet damper to the appropriate position, which controls the air outlet switching.

  The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.

• for RHD:

  The No. 2 air conditioning radiator damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the air outlet damper to the appropriate position, which controls the air outlet switching.

  The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.

• *1: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

• *2: for LHD

• *3: for RHD

WIRING DIAGRAM

1. for LHD

   

2. for RHD

   

CAUTION / NOTICE / HINT

PROCEDURE

1. CONFIRM MODEL

   
   

   1. Choose the model to be inspected.

      Result
      Result Proceed to for LHD A for RHD B

   
   

   B

   CHECK FOR DTC Click here

   A

2. CHECK FOR DTC

   
   

   1. Check for DTCs.

      Click here

      
      Body Electrical > Air Conditioner > Trouble Codes

      Result
      Result Proceed to DTC B1497/97 is not output A DTC B1497/97 is output B

   
   

   B

   GO TO DTC B1497/97 Click here

   A

3. INSPECT NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)

   
   

   1. Check that the No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

      Click here

      OK
      Check that the No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

      Result
      Proceed to OK NG

   
   

   NG

   INSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY CORRECTLY

   OK

4. INSPECT NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)

   
   

   1. Check for a wire harness caught between the links of the motors and dampers.

      OK
      No wire harnesses are caught between the links of the motors and dampers.

      Result
      Proceed to OK NG

   
   

   NG

   REMOVE PINCHED WIRE HARNESS

   OK

5. INSPECT AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)

   
   

   1. Remove the No. 1 air conditioning radiator damper servo sub-assembly.

      Click here

   2. Operate the dampers by hand.

      OK
      The dampers are easily operated by hand.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE AIR CONDITIONING RADIATOR ASSEMBLY Click here

   OK

6. PERFORM ACTIVE TEST USING GTS

   
   

   1. Remove the No. 3 air conditioning radiator damper servo sub-assembly.

      Click here

   2. Connect the No. 3 air conditioning radiator damper servo sub-assembly connector to the No. 1 air conditioning radiator damper servo sub-assembly.

   3. Connect the GTS to the DLC3.

   4. Turn the power switch on (IG).

   5. Turn the GTS on.

   6. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

   7. Perform the Active Test according to the display on the GTS.

      
      Body Electrical > Air Conditioner > Active Test

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      A/O Servo Pulse(Rr D)	No. 3 air conditioning radiator damper servo sub-assembly pulse*	Min.: 128 Max.: 383	Operates between 250 to 297 pulses

      
      

      • *: Thus this Active Test is for the No. 3 air conditioning radiator damper servo sub-assembly, in this case it is used to check the operation of the No. 1 air conditioning radiator damper servo sub-assembly.

      
      Body Electrical > Air Conditioner > Active Test

      Tester Display
      A/O Servo Pulse(Rr D)

      OK
      The No. 1 air conditioning radiator damper servo sub-assembly operates.

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

   NG

   REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here

7. CHECK FOR DTC

   
   

   1. Check for DTCs.

      Click here

      
      Body Electrical > Air Conditioner > Trouble Codes

      Result
      Result Proceed to DTC B1497/97 is output A DTC B1441/41, B1442/42, B1443/43 and B1446/46 are output B DTC B1443/43 is output C

   
   

   A

   GO TO DTC B1497/97 Click here

   B

   REPLACE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here

   C

8. INSPECT NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)

   
   

   1. Check for a wire harness caught between the links of the motors and dampers.

      OK
      No wire harnesses are caught between the links of the motors and dampers.

      Result
      Proceed to OK NG

   
   

   NG

   REMOVE PINCHED WIRE HARNESS

   OK

9. INSPECT AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)

   
   

   1. Remove the No. 2 air conditioning radiator damper servo sub-assembly.

      Click here

   2. Operate the dampers by hand.

      OK
      The dampers are easily operated by hand.

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here

   NG

   REPLACE AIR CONDITIONING RADIATOR ASSEMBLY Click here