AIR CONDITIONING SYSTEM, Diagnostic DTC:B14B9

DTC Code DTC Name
B14B9 Open in Ion Generator Circuit

DESCRIPTION

The ion generator is controlled by the air conditioning amplifier and operates in accordance with the blower with fan motor. The air conditioning amplifier sends a drive signal to the ion generator. When the ion generator receives the drive signal and starts to operate, it outputs an operation condition signal to the air conditioning amplifier.

DTC Code DTC Detection Condition Trouble Area
B14B9 Open in ion generator circuit

  • Ion generator

  • Air conditioning amplifier

  • Harness or connector

WIRING DIAGRAM

A01GMZOE02

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (ION GENERATOR - BODY GROUND)


    1. A01GNDWE01

      Disconnect the M3 ion generator connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      M3-5 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (ION GENERATOR - BATTERY)


    1. A01GNDWE02

      Disconnect the M3 ion generator connector.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      M3-2 (IG) - Body ground Engine switch off Below 1 V
      M3-2 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (ION GENERATOR - AIR CONDITIONING AMPLIFIER)

    A01GIA7E04

    1. Disconnect the M3 ion generator connector.

    2. Disconnect the L76 air conditioning amplifier connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L76-22 (NAIN) - M3-1 (IG+) Always Below 1 Ω
      L76-8 (NANO) - M3-5 (POL) Always Below 1 Ω
      L76-22 (NAIN) - Body ground Always 10 kΩ or higher
      L76-8 (NANO) - Body ground Always 10 kΩ or higher
      L76-22 (NAIN) - L76-8 (NANO) Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK ION GENERATOR


    1. Replace the ion generator with a new or normally functioning one Click here.

      Tech Tips

      Since the ion generator cannot be inspected while it is removed from the vehicle, replace the ion generator with a new or a known good one and check that the condition returns to normal.

    2. Check for the DTC.

      Result
      Result Proceed to
      DTC B14B9 is output A
      DTC B14B9 is not output B

    B

    END (ION GENERATOR IS DEFECTIVE)

    A

    REPLACE AIR CONDITIONING AMPLIFIER Click here