AIR CONDITIONING SYSTEM, Diagnostic DTC:B1497/97

DTC Code DTC Name
B1497/97 BUS IC Communication Malfunction

DESCRIPTION

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

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

  • Air conditioning harness

  • A/C amplifier

WIRING DIAGRAM

A003TH9E50

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT A/C AMPLIFIER


    1. A003SQHE94
      Text in Illustration
      *1

      Component with harness connected

      (A/C Amplifier)

      Remove the A/C amplifier 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 A/C AMPLIFIER Click here

    OK

  2. INSPECT A/C AMPLIFIER


    1. A003SQHE95
      Text in Illustration
      *1

      Component with harness connected

      (A/C Amplifier)

      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

    NG

    REPLACE A/C AMPLIFIER Click here

    OK

    REPLACE AIR CONDITIONING HARNESS Click here