AIR CONDITIONING SYSTEM, Diagnostic DTC:B14B9

DTC Code DTC Name
B14B9 Open in Ion Generator Circuit

DESCRIPTION

The No. 1 ion generator sub-assembly is controlled by the air conditioning amplifier assembly and operates in accordance with the blower with fan motor assembly. The air conditioning amplifier assembly sends a drive signal to the No. 1 ion generator sub-assembly. When the ion generator receives the drive signal and starts to operate, it outputs an operation condition signal to the air conditioning amplifier assembly.

DTC No. DTC Detection Condition Trouble Area
B14B9 Open in No. 1 ion generator sub-assembly circuit
  • No. 1 ion generator sub-assembly

  • Air conditioning amplifier assembly

  • Harness or connector

WIRING DIAGRAM

A01FHEOE07

INSPECTION PROCEDURE

Note


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

  • Before disconnecting the cable form the negative (-) battery terminal or replacing the air conditioning amplifier assembly, record the last operation state of the air conditioning for each transmitter. After replacement, it is necessary to perform memory registration for each transmitter Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (NO. 1 ION GENERATOR SUB-ASSEMBLY - BODY GROUND)


    1. A01FIRHE01
      Text in Illustration
      *a

      Front view of harness connector

      (to No. 1 Ion Generator Sub-assembly)

      Disconnect the No. 1 ion generator sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N70-5 (GND) - Body ground Always Below 1 Ω

    NG
    OK
  2. CHECK HARNESS AND CONNECTOR (NO. 1 ION GENERATOR SUB-ASSEMBLY - BATTERY)


    1. A01FIRHE02
      Text in Illustration
      *a

      Front view of harness connector

      (to No. 1 Ion Generator Sub-assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N70-2 (IG) - Body ground Engine switch off Below 1 V
      N70-2 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (NO. 1 ION GENERATOR SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the N79 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N79-22 (NAIN) - N70-1 (IG+) Always Below 1 Ω
      N79-9 (NANO) - N70-4 (PCL) Always Below 1 Ω
      N79-22 (NAIN) - Body ground Always 10 kΩ or higher
      N79-9 (NANO) - Body ground Always 10 kΩ or higher
      N79-22 (NAIN) - N79-9 (NANO) Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (When troubleshooting according to Problem Symptoms Table) B
      OK (When troubleshooting according to the DTC) C

    B
    C
    A
  4. CHECK NO. 1 ION GENERATOR SUB-ASSEMBLY


    1. Replace the No. 1 ion generator sub-assembly with a new or normally functioning one Click here.

      Tech Tips

      Since the No. 1 ion generator sub-assembly cannot be inspected while it is removed from the vehicle, replace the No. 1 ion generator sub-assembly 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
    A