AIR CONDITIONING SYSTEM, Diagnostic DTC:B1497

DTC Code DTC Name
B1497 Communication Malfunction (Bus Ic)

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 Communication Malfunction (Bus Ic)

  • Diagnosis condition: None

  • Malfunction status: Error or open in communication line between air conditioning amplifier assembly and servo motor

  • Air conditioning harness assembly

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

  • No. 2 air conditioning radiator damper servo sub-assembly

  • No. 3 air conditioning radiator damper servo sub-assembly

  • 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

  • No. 1 blower damper servo sub-assembly

  • Air conditioning amplifier assembly

 Memorized

WIRING DIAGRAM

Figure 1. for LHD:

B004Y73E02
B004X2BE03

Figure 2. for RHD:

B004Y73E03
B004X2BE04

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (SERVO PULSE)


    1. Connect the GTS to the DLC3.

    2. Turn the power 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 Restrict Condition
      Air Mix Servo Targ Pulse(D)

        for LHD:

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


        for RHD:

      • No. 4 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operation

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 254 to 326 pulses


        for RHD:

      • Operates between 186 to 258 pulses
      Air Mix Servo Targ Pulse(P)

        for LHD:

      • No. 4 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) operation


        for RHD:

      • No. 6 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) operation

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 186 to 258 pulses


        for RHD:

      • Operates between 254 to 326 pulses
      Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly pulse

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 258 to 290 pulses


        for RHD:

      • Operates between 222 to 254 pulses
      Cool A/M Servo Pulse(D)

        for LHD:

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


        for RHD:

      • No. 4 air conditioning radiator damper servo sub-assembly (driver side lower air mix) operation

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 254 and 358 pulses


        for RHD:

      • Operates between 154 to 258 pulses
      Cool A/M Servo Pulse(P)

        for LHD:

      • No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) operation


        for RHD:

      • No. 6 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) operation

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 154 and 258 pulses


        for RHD:

      • Operates between 254 to 326 pulses
      Face A/O Servo Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FACE) operation

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 258 and 364 pulses


        for RHD:

      • Operates between 148 to 254 pulses
      Foot A/O Servo Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FOOT) operation

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 258 and 365 pulses


        for RHD:

      • Operates between 147 to 254 pulses
      Face A/O Servo Pulse(P)

        for LHD:

      • No. 6 air conditioning radiator damper servo sub-assembly (front passenger side MODE FACE) operation


        for RHD:

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

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 148 and 254 pulses


        for RHD:

      • Operates between 258 and 364 pulses
      Foot A/O Servo Pulse(P)

        for LHD:

      • No. 6 air conditioning radiator damper servo sub-assembly (front passenger side MODE FOOT) operation


        for RHD:

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

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 147 and 254 pulses


        for RHD:

      • Operates between 258 and 365 pulses
      A/M Servo Pulse(F&R D)

        for LHD:

      • No. 2 air conditioning radiator damper servo sub-assembly (air mix (rear LH)) operation


        for RHD:

      • No. 4 air conditioning radiator damper servo sub-assembly (air mix (rear RH)) operation

      Min.: 128

      Max.: 383

      		 Operates between 154 and 258 pulses
      A/M Servo Pulse(F&R P)

        for LHD:

      • No. 4 air conditioning radiator damper servo sub-assembly (air mix (rear RH)) operation


        for RHD:

      • No. 6 air conditioning radiator damper servo sub-assembly (air mix (rear LH)) operation

      Min.: 128

      Max.: 383

      		 Operates between 154 and 258 pulses
      A/O Servo Pulse(F&R D)

        for LHD:

      • Heater air damper servo assembly (MODE FACE (rear LH)) operation


        for RHD:

      • Heater air damper servo assembly (MODE FACE (rear RH)) operation

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 234 and 263 pulses


        for RHD:

      • Operates between 249 and 278 pulses
      A/O Servo Pulse(F&R P)

        for LHD:

      • Heater air damper servo assembly (MODE FACE (rear RH)) operation


        for RHD:

      • Heater air damper servo assembly (MODE FACE (rear LH)) operation

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 234 and 263 pulses


        for RHD:

      • Operates between 249 and 278 pulses
      A/O Servo Pulse(Rr D)

        for LHD:

      • No. 1 rear cooling unit damper servo sub-assembly (MODE LH) operation


        for RHD:

      • No. 1 rear cooling unit damper servo sub-assembly (MODE RH) operation

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 234 and 278 pulses


        for RHD:

      • Operates between 237 and 275 pulses
      A/O Servo Pulse(Rr P)

        for LHD:

      • No. 1 rear cooling unit damper servo sub-assembly (MODE RH) operation


        for RHD:

      • No. 1 rear cooling unit damper servo sub-assembly (MODE LH) operation

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 237 and 275 pulses


        for RHD:

      • Operates between 234 and 278 pulses
      DEF A/O Servo Pulse(D) No. 3 air conditioning radiator damper servo sub-assembly (MODE DEF) operation

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 242 and 348 pulses


        for RHD:

      • Operates between 164 and 270 pulses
      Air Outlet Rear FOOT (Driver Side)

        for LHD:

      • No. 5 air conditioning radiator damper servo sub-assembly (MODE FOOT (rear LH)) operation


        for RHD:

      • No. 5 air conditioning radiator damper servo sub-assembly (MODE FOOT (rear RH)) operation

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 253 and 267 pulses


        for RHD:

      • Operates between 245 and 259 pulses
      Air Outlet Rear FOOT (Passenger Side)

        for LHD:

      • No. 5 air conditioning radiator damper servo sub-assembly (MODE FOOT (rear RH)) operation


        for RHD:

      • No. 5 air conditioning radiator damper servo sub-assembly (MODE FOOT (rear LH)) operation

      Min.: 128

      Max.: 383

      		 Operates between 245 and 259 pulses

      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 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
      Face A/O Servo Pulse(D)

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

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

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

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

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

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

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      A/O Servo Pulse(F&R P)

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

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

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

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Outlet Rear FOOT (Driver Side)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Outlet Rear FOOT (Passenger Side)
      OK
      Damper servo motor is operated.
      Result
      Result Proceed to
      All damper servo motors are not operated A
      Any damper servo motor is not operated B
      All damper servo motors are operated C

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

  2. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (POWER SOURCE CIRCUIT)


    1. Disconnect the air conditioning amplifier assembly connector.

      B004XROC01
      *a

      Component without harness connected

      (Air Conditioning Amplifier Assembly)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (BUSG) - Body ground Always Below 1 Ω
      7 (BUSG) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3 (BUS G) - Body ground Power switch off 11 to 14 V
      9 (BUS G) - Body ground Power switch off 11 to 14 V

    4. Using an oscilloscope, check the waveform.

      Item Content
      Tester Connection

      2 (BUS) - 1 (BUS G)

      8 (BUS) - 7 (BUS G)
      Tool Setting 2 V/DIV., 20 μs/DIV.
      Condition Power switch on (IG)
      OK
      The waveform displays properly.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here