AIR CONDITIONING SYSTEM(for Manual Air Conditioning System), Diagnostic DTC:B1497

DESCRIPTION

• for Front Side

  The air conditioning harness assembly connects the air conditioning amplifier assembly and the servo motors. The air conditioning amplifier assembly supplies power and sends operation instructions to each servo motor through the air conditioning harness assembly. Each servo motor sends damper position information to the air conditioning amplifier assembly.

• for Rear Side

  The No. 2 air conditioning harness assembly connects the air conditioning amplifier assembly and the servo motors. The air conditioning amplifier assembly supplies power and sends operation instructions to each servo motor through the No. 2 air conditioning harness assembly. Each servo motor sends damper position information to the air conditioning amplifier assembly.

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

WIRING DIAGRAM

1. for Front Side

   

2. for Rear Side

   

CAUTION / NOTICE / HINT

PROCEDURE

1. PERFORM ACTIVE TEST USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Air Conditioner / Active test.

   5. Check the operation by referring to the table below.

      
      Body Electrical > Air Conditioner > Active Test

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      Air Mix Servo Targ Pulse(D)	No. 1 air conditioning radiator damper servo sub-assembly (air mix) pulse	Min.: 128 Max.: 383	Operates between 7 to 105 pulses
      Air Outlet Servo Pulse (D)	No. 1 air conditioning radiator damper servo sub-assembly (air outlet) pulse	Min.: 128 Max.: 383	Operates between 8 to 97 pulses
      Air Inlet Damper Targ Pulse	Blower damper servo sub-assembly (air inlet) pulse	Min.: 128 Max.: 383	Operates between 7 to 28 pulses
      A/M Servo Pulse(F&R D)	Rear air mix damper servo sub-assembly pulse	Min.: 128 Max.: 383	Operates between 9 to 54 pulses
      A/O Servo Pulse(F&R D)	Rear mode damper servo sub-assembly pulse	Min.: 128 Max.: 383	Operates between 7 to 83 pulses

      
      Body Electrical > Air Conditioner > Active Test

      Tester Display
      Air Mix Servo Targ Pulse(D)

      
      Body Electrical > Air Conditioner > Active Test

      Tester Display
      Air Outlet Servo Pulse (D)

      
      Body Electrical > Air Conditioner > Active Test

      Tester Display
      Air Inlet Damper Targ Pulse

      
      Body Electrical > Air Conditioner > Active Test

      Tester Display
      A/M Servo Pulse(F&R D)

      
      Body Electrical > Air Conditioner > Active Test

      Tester Display
      A/O Servo Pulse(F&R D)

      OK
      Arm of the damper servo motor selected in the Active Test operates smoothly.

   6. According to the test result, proceed to the next step.

      Result
      Result Proceed to One of the front damper servo motors is malfunctioning A All of the front damper servo motors are malfunctioning B One of the rear damper servo motors is malfunctioning C All of the rear damper servo motors are malfunctioning D All of the damper servo motors are normal E

   
   

   B

   GO TO STEP 6 Click here

   C

   SYSTEM CHECK Click here

   D

   GO TO STEP 11 Click here

   E

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

   A

2. SYSTEM CHECK

   
   

   1. According to the test result, proceed to the next step.

      Result
      Result Proceed to Only the No. 1 air conditioning radiator damper servo sub-assembly (air mix) is malfunctioning A Only the No. 1 air conditioning radiator damper servo sub-assembly (air outlet) is malfunctioning B Only the blower damper servo sub-assembly (air inlet) is malfunctioning C

   
   

   B

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

   C

   REPLACE BLOWER DAMPER SERVO SUB-ASSEMBLY (AIR INLET) Click here

   A

3. REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR MIX)

   
   

   1. Replace the No. 1 air conditioning radiator damper servo sub-assembly (air mix).

      Click here

      Tech Tips

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or known good one and check that the condition returns to normal.

   2. Check for DTCs.

      Click here

      
      Body Electrical > Air Conditioner > Trouble Codes

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

   
   

   A

   END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR MIX) WAS DEFECTIVE)

   B

   GO TO STEP 6 Click here

4. REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR OUTLET)

   
   

   1. Replace the No. 1 air conditioning radiator damper servo sub-assembly (air outlet).

      Click here

      Tech Tips

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or known good one and check that the condition returns to normal.

   2. Check for DTCs.

      Click here

      
      Body Electrical > Air Conditioner > Trouble Codes

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

   
   

   A

   END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR OUTLET) WAS DEFECTIVE)

   B

   GO TO STEP 6 Click here

5. REPLACE BLOWER DAMPER SERVO SUB-ASSEMBLY (AIR INLET)

   
   

   1. Replace the blower damper servo sub-assembly (air inlet).

      Click here

      Tech Tips

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or known good one and check that the condition returns to normal.

   2. Check for DTCs.

      Click here

      
      Body Electrical > Air Conditioner > Trouble Codes

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

   
   

   A

   END (BLOWER DAMPER SERVO SUB-ASSEMBLY (AIR INLET) WAS DEFECTIVE)

   B

6. REPLACE AIR CONDITIONING HARNESS ASSEMBLY

   
   

   1. Replace the air conditioning harness assembly.

      Click here

      Tech Tips

      Since the air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning harness assembly with a new or known good one and check that the condition returns to normal.

   2. Check for DTCs.

      Click here

      
      Body Electrical > Air Conditioner > Trouble Codes

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

   
   

   A

   END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)

   B

7. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

   
   

   1. Disconnect the F80 air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition F80-21 (B) - Body ground Always 11 to 14 V

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

8. SYSTEM CHECK

   
   

   1. According to the test result, proceed to the next step.

      Result
      Result Proceed to Only the rear air mix damper servo sub-assembly is malfunctioning A Only the rear mode damper servo sub-assembly is malfunctioning B

   
   

   B

   REPLACE REAR MODE DAMPER SERVO SUB-ASSEMBLY Click here

   A

9. REPLACE REAR AIR MIX DAMPER SERVO SUB-ASSEMBLY

   
   

   1. Replace the rear air mix damper servo sub-assembly.

      Click here

      Tech Tips

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or known good one and check that the condition returns to normal.

   2. Check for DTCs.

      Click here

      
      Body Electrical > Air Conditioner > Trouble Codes

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

   
   

   A

   END (REAR AIR MIX DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

   B

   GO TO STEP 6 Click here

10. REPLACE REAR MODE DAMPER SERVO SUB-ASSEMBLY

    
    

    1. Replace the rear mode damper servo sub-assembly.

       Click here

       Tech Tips

       Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or known good one and check that the condition returns to normal.

    2. Check for DTCs.

       Click here

       
       Body Electrical > Air Conditioner > Trouble Codes

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

    
    

    A

    END (REAR MODE DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

    B

11. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - NO. 2 AIR CONDITIONING HARNESS ASSEMBLY)

    
    

    1. Disconnect the L20 No. 2 air conditioning harness assembly connector.

    2. Disconnect the F81 air conditioning amplifier assembly connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition F81-27 (R BBU) - L20-4 (R BBU) Always Below 1 Ω F81-1 (R BUS) - L20-3 (R BUS) Always Below 1 Ω F81-25 (R BUG) - L20-2 (R BUG) Always Below 1 Ω F81-27 (R BBU) - Body ground Always 10 kΩ or higher F81-1 (R BUS) - Body ground Always 10 kΩ or higher F81-25 (R BUG) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

12. REPLACE NO. 2 AIR CONDITIONING HARNESS ASSEMBLY

    
    

    1. Replace the No. 2 air conditioning harness assembly.

       Click here

       Tech Tips

       Since the No. 2 air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the No. 2 air conditioning harness assembly with a new or known good one and check that the condition returns to normal.

    2. Check for DTCs.

       Click here

       
       Body Electrical > Air Conditioner > Trouble Codes

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

    
    

    A

    END (NO. 2 AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)

    B

13. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    
    

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

       Standard Voltage
       Tester Connection Condition Specified Condition F81-28 (+B2) - Body ground Always 11 to 14 V

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR