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

A017B1FE04

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK AIR CONDITIONING AMPLIFIER


    1. A017GAQE16

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

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

      Standard resistance
      Tester Connection Condition Specified Condition
      z17-2 (BUS G) - Body ground Always Below 1 Ω

    NG

    CHECK GROUND LINE AND AIR CONDITIONING AMPLIFIER

    OK

  2. CHECK AIR CONDITIONING AMPLIFIER


    1. A017GAQE17

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

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

      Standard voltage
      Tester Connection Condition Specified Condition
      z17-2 (BUS G) - z17-4 (B BUS) Ignition switch on (IG) 11 to 14 V
      z17-2 (BUS G) - z17-3 (BUS) Ignition switch on (IG) Pulse generation

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY