AIR CONDITIONING SYSTEM, Diagnostic DTC:B1497/97

DTC Code DTC Name
B1497/97 BUS IC Communication Malfunction

DESCRIPTION

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.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1497/97 BUS IC Communication Malfunction

Any of the following conditions is met:


  • Error in communication line

  • Open in communication line

  • Air conditioning harness assembly

  • No. 1 air conditioning radiator damper servo sub-assembly

  • No. 2 air conditioning radiator damper servo sub-assembly (driver side air mix)

  • No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix)

  • No. 3 air conditioning radiator damper servo sub-assembly (front passenger side lower)*2

  • No. 3 air conditioning radiator damper servo sub-assembly (driver side lower)*3

  • No. 4 air conditioning radiator damper servo sub-assembly

  • No. 5 air conditioning radiator damper servo sub-assembly

  • No. 6 air conditioning radiator damper servo sub-assembly*1

  • No. 7 air conditioning radiator damper servo sub-assembly

  • No. 1 blower damper servo sub-assembly

  • No. 3 air conditioning radiator damper servo sub-assembly (rear air mix)*1

  • Air conditioning amplifier assembly

Memorized

(10 seconds or more)

Tech Tips

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

DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Engine switch to on (IG) ○ ○
Malfunction Status Error in communication line ○ -
Open in communication line - ○
Detection Time 10 seconds or more 10 seconds or more
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

B002D7FE01

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • Before disconnecting the cable from the negative (-) battery terminal or replacing the air conditioning amplifier assembly, record the last operation state of the air conditioning for each transmitter. After replacement, it is necessary to perform memory registration for each transmitter.

    Click here

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    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. 2 air conditioning radiator damper servo sub-assembly (driver side air mix)

      Min.: 128

      Max.: 383

      Operates between 254 to 360 pulses*2

      Operates between 152 to 258 pulses*3
      Air Mix Servo Targ Pulse(P) No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix)

      Min.: 128

      Max.: 383

      Operates between 152 to 258 pulses*2

      Operates between 254 to 360 pulses*3
      Air Outlet Servo Pulse (D) No. 6 air conditioning radiator damper servo sub-assembly*4 or No. 5 air conditioning radiator damper servo sub-assembly*5

      Min.: 128

      Max.: 383

      Operates between 140 to 254 pulses*4

      Operates between 258 to 372 pulses*5
      Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly

      Min.: 128

      Max.: 383

      Operates between 206 to 238 pulses*2

      Operates between 274 to 306 pulses*3
      Rear Air Mix Servo Targ Pulse No. 3 air conditioning radiator damper servo sub-assembly (rear air mix)*1

      Min.: 128

      Max.: 383

      		 Operates between 254 to 360 pulses
      Air Outlet Servo Pulse (P) No. 5 air conditioning radiator damper servo sub-assembly*6 or No. 6 air conditioning radiator damper servo sub-assembly*5

      Min.: 128

      Max.: 383

      Operates between 258 to 372 pulses*6

      Operates between 140 to 254 pulses*5
      Cool A/M Servo Pulse(D) No. 4 air conditioning radiator damper servo sub-assembly*2 or No. 3 air conditioning radiator damper servo sub-assembly (driver side lower)*3

      Min.: 128

      Max.: 383

      		 Operates between 254 to 360 pulses
      Cool A/M Servo Pulse(P) No. 3 air conditioning radiator damper servo sub-assembly (front passenger side lower)*2 or No. 4 air conditioning radiator damper servo sub-assembly*3

      Min.: 128

      Max.: 383

      		 Operates between 254 to 360 pulses
      A/O Servo Pulse(Rr D) No. 7 air conditioning radiator damper servo sub-assembly

      Min.: 128

      Max.: 383

      		 Operates between 242 to 353 pulses
      DEF A/O Servo Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly

      Min.: 128

      Max.: 383

      		 Operates between 164 to 270 pulses

      • *1: w/ Rear Control Switch

      • *2: for LHD

      • *3: for RHD

      • *4: for LHD or RHD without Rear Control Switch

      • *5: for RHD with Rear Control Switch

      • *6: for LHD with Rear Control Switch


      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Mix Servo Targ Pulse(D)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Mix Servo Targ Pulse(P)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Outlet Servo Pulse (D)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Outlet Servo Pulse (P)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Inlet Damper Targ Pulse

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Cool A/M Servo Pulse(D)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Cool A/M Servo Pulse(P)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      A/O Servo Pulse(Rr D)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Rear Air Mix Servo Targ Pulse

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      DEF A/O Servo Pulse(D)
      OK
      Damper servo motors signal changes according to the target pulse specified by the Active Test.

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

      Result
      Result Proceed to
      One of the damper servo motors is malfunctioning (air mix damper servo motor) A
      One of the damper servo motors is malfunctioning (air outlet damper servo motor) B
      Only the No. 1 blower damper servo sub-assembly is malfunctioning C
      All of the damper servo motors are malfunctioning D

    B

    SYSTEM CHECK Click here

    C

    REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY Click here

    D

    REPLACE AIR CONDITIONING HARNESS 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. 2 air conditioning radiator damper servo sub-assembly (driver side air mix) is malfunctioning A
      Only the No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix) is malfunctioning B
      Only the No. 3 air conditioning radiator damper servo sub-assembly (front passenger side lower)*1 or No. 3 air conditioning radiator damper servo sub-assembly (driver side lower)*2 is malfunctioning C
      Only the No. 4 air conditioning radiator damper servo sub-assembly is malfunctioning D
      Only the No. 3 air conditioning radiator damper servo sub-assembly (rear air mix) is malfunctioning*3 E

      • *1: for LHD

      • *2: for RHD

      • *3: w/ Rear Control Switch


    B

    REPLACE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE AIR MIX) Click here

    C

    REPLACE NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE LOWER) OR NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE LOWER) Click here

    D

    REPLACE NO. 4 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here

    E

    REPLACE NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (REAR AIR MIX) Click here

    A

  3. REPLACE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE AIR MIX)


    1. Replace the No. 2 air conditioning radiator damper servo sub-assembly (driver side 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 B1497/97 is not output A
      DTC B1497/97 is output B

    A

    END (NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [DRIVER SIDE AIR MIX] WAS DEFECTIVE)

    B

    GO TO STEP 14 Click here

  4. REPLACE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE AIR MIX)


    1. Replace the No. 2 air conditioning radiator damper servo sub-assembly (front passenger side 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 B1497/97 is not output A
      DTC B1497/97 is output B

    A

    END (NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [FRONT PASSENGER SIDE AIR MIX] WAS DEFECTIVE)

    B

    GO TO STEP 14 Click here

  5. REPLACE NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE LOWER) OR NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE LOWER)


    1. Replace the No. 3 air conditioning radiator damper servo sub-assembly (front passenger side lower)*1 or No. 3 air conditioning radiator damper servo sub-assembly (driver side lower)*2.

      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.


      • *1: for LHD

      • *2: for RHD

    2. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B1497/97 is not output (for LHD) A
      DTC B1497/97 is not output (for RHD) B
      DTC B1497/97 is output C

    A

    END (NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [FRONT PASSENGER SIDE LOWER] WAS DEFECTIVE)

    B

    END (NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [DRIVER SIDE LOWER] WAS DEFECTIVE)

    C

    GO TO STEP 14 Click here

  6. REPLACE NO. 4 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 4 air conditioning radiator 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 B1497/97 is not output A
      DTC B1497/97 is output B

    A

    END (NO. 4 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

    B

    GO TO STEP 14 Click here

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


    1. Replace the No. 3 air conditioning radiator damper servo sub-assembly (rear 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 B1497/97 is not output A
      DTC B1497/97 is output B

    A

    END (NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [REAR AIR MIX] WAS DEFECTIVE)

    B

    GO TO STEP 14 Click here

  8. 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 is malfunctioning A
      Only the No. 6 air conditioning radiator damper servo sub-assembly is malfunctioning B
      Only the No. 5 air conditioning radiator damper servo sub-assembly is malfunctioning* C
      Only the No. 7 air conditioning radiator damper servo sub-assembly is malfunctioning D

      • *: w/ Rear Control Switch


    B

    REPLACE NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here

    C

    REPLACE NO. 6 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here

    D

    REPLACE NO. 7 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here

    A

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


    1. Replace the No. 1 air conditioning radiator 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 a known good one and check that the condition returns to normal.

    2. Check for DTCs.

      Click here

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

    A

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

    B

    GO TO STEP 14 Click here

  10. REPLACE NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 5 air conditioning radiator 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 a known good one and check that the condition returns to normal.

    2. Check for DTCs.

      Click here

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

    A

    END (NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

    B

    GO TO STEP 14 Click here

  11. REPLACE NO. 6 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 6 air conditioning radiator 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 a known good one and check that the condition returns to normal.

    2. Check for DTCs.

      Click here

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

    A

    END (NO. 6 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

    B

    GO TO STEP 14 Click here

  12. REPLACE NO. 7 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 7 air conditioning radiator 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 B1497/97 is not output A
      DTC B1497/97 is output B

    A

    END (NO. 7 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

    B

    GO TO STEP 14 Click here

  13. REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 1 blower 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 B1497/97 is not output A
      DTC B1497/97 is output B

    A

    END (NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

    B

  14. 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 B1497/97 is not output A
      DTC B1497/97 is output B

    A

    END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)

    B

  15. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. Disconnect the K64 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
      K64-6 (+B1) - 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