AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System), Diagnostic DTC:B1497/97

DTC Code DTC Name
B1497/97 BUS IC Communication Malfunction

DESCRIPTION

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

DTC No. DTC Detection Condition Trouble Area
B1497/97 Communication line error or open

  • Air conditioning harness

  • Air conditioning amplifier

WIRING DIAGRAM

A011860E02

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT AIR CONDITIONING AMPLIFIER (GROUND LINE)

    A01170AE10
    Text in Illustration
    *1

    Component with harness connected

    (Air Conditioning Amplifier)

    1. Remove the air conditioning amplifier with its connectors still connected Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z1-2 (BUS G) - Body ground Always Below 1 Ω

    3. Reinstall the air conditioning amplifier.


    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

  2. INSPECT AIR CONDITIONING AMPLIFIER

    A01170AE11
    Text in Illustration
    *1

    Component with harness connected

    (Air Conditioning Amplifier)

    1. Remove the air conditioning amplifier with its connectors still connected Click here.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      z1-4 (B BUS ) - z1-2 ( BUS G) Always 11 to 14 V
      z1-3 (BUS) - z1-2 (BUS G) Ignition switch ON Pulse generation

    3. Reinstall the air conditioning amplifier.


    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

    REPLACE AIR CONDITIONING HARNESS Click here