AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System), Diagnostic DTC:B1447/47

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DESCRIPTION

The rear air mix damper servo sub-assembly sends pulse signals to indicate the damper position to the air conditioning amplifier. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the rear air mix damper to any position. As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted and the temperature of the air blowing toward the rear is controlled.

The air conditioning amplifier communicates with the servo through the No. 2 air conditioning harness assembly.

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INSPECTION PROCEDURE

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PROCEDURE

1. Click here

   CHECK FOR DTC

   
   

   1. Clear the DTCs (Click here).

   2. Check for DTCs (Click here).

      Table 1. Result

      Result	Proceed to
      DTC B1447/47 is not output	A
      DTC B1447/47 is output	B
      DTC B1447/47 and B1497/97 are output	C

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

   READ VALUE USING INTELLIGENT TESTER (REAR AIR MIX DAMPER SERVO)

   
   

   1. Use the Data List to check if the rear air mix damper servo sub-assembly is functioning properly (Click here).

      Table 2. Air Conditioner

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Air Mix Servo Targ Pulse (R)	Rear air mix damper servo sub-assembly target pulse / Min.: 0, Max.: 255	9 (pulse): MAX COOL 54 (pulse): MAX HOT	-
      Air Mix Servo Actual Pulse (R)	Rear air mix damper servo sub-assembly actual pulse / Min.: 0, Max.: 255	9 (pulse): MAX COOL 54 (pulse): MAX HOT	-

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

      Table 3. Result

      Result	Proceed to
      OK (When troubleshooting according to the DTC)	A
      OK (When troubleshooting according to Problem Symptoms Table	B
      Both target pulse and actual pulse do not display	C
      Target pulse displays normally, but actual pulse does not display	D

   
   
   • AClick here
   • BClick here
   • CClick here
   • DClick here
3. Click here

   CHECK FOR DTC

   
   

   1. Clear the DTCs (Click here).

   2. Check for DTCs (Click here).

      OK
      DTC B1447 is not output.

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK REAR AIR MIX DAMPER SERVO SUB-ASSEMBLY

   
   

   1. Replace the rear air mix damper servo sub-assembly (Click here).

      Tip:

      Since the rear air mix damper servo sub-assembly cannot be inspected while it is removed from the vehicle, replace the rear air mix damper servo sub-assembly with a new or normally functioning one.

   2. Clear the DTCs (Click here).

   3. Check for DTCs (Click here).

      OK
      DTC B1447 is not output.

   
   
   • OKClick here
   • NGClick here
5. Click here

   CHECK AIR CONDITIONING HARNESS ASSEMBLY

   
   

   1. Temporarily replace the air conditioning harness assembly with a new or normally functioning one (Click here).

   2. Clear the DTCs (Click here).

   3. Check for DTCs (Click here).

      OK
      DTC B1447 is not output.

   
   
   • OKClick here
   • NGClick here
6. Click here

   USE SIMULATION METHOD TO CHECKClick here

7. Click here

   GO TO B1497/97Click here

8. Click here

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

9. Click here

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

10. Click here

    END (REAR AIR MIX DAMPER SERVO SUB-ASSEMBLY IS FAULTY)

11. Click here

    END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)