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

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

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A004Z9DE05

PROCEDURE


  1. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A00502IE03
      Text in Illustration
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Remove the air conditioning amplifier assembly with the connectors still connected.

    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

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  2. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A004X27E03
      Text in Illustration
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      z1-4 (B BUS) - z1-2 (BUS G) Power switch off Below 1 V
      z1-4 (B BUS) - z1-2 (BUS G) Power switch on (IG) 11 to 14 V
      z1-3 (BUS) - z1-2 (BUS G) Power switch on (IG) Pulse generation

    OK

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here