AIR CONDITIONING SYSTEM, Diagnostic DTC:B14B3

DTC Code DTC Name
B14B3 Lost Communication with Rear Panel LIN

DESCRIPTION

The rear control switch communicates with the air conditioning amplifier assembly through the LIN communication system.

If the LIN communication system malfunctions, the air conditioning amplifier assembly does not operate even if the rear control switch is operated.

DTC No. DTC Detection Condition Trouble Area
B14B3 Lost communication with the rear control switch.

  • Rear control switch

  • Air conditioning amplifier assembly

  • LIN communication system

  • Harness or connector

WIRING DIAGRAM

A01FDVVE17

INSPECTION PROCEDURE

Note


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

  • When the battery is disconnected or the air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization Click here.

  • 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 (REAR CONTROL SWITCH - BATTERY)


    1. A01FEPWE01
      Text in Illustration
      *a

      Front view of harness connector

      (to Rear Control Switch)

      Disconnect the rear control switch connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Z1-7 (IG+) - Body ground Engine switch off Below 1 V
      Z1-7 (IG+) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (REAR CONTROL SWITCH - BODY GROUND)


    1. A01FEPWE02
      Text in Illustration
      *a

      Front view of harness connector

      (to Rear Control Switch)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Z1-5 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - REAR CONTROL SWITCH)


    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
      Z1-9 (RLIN) - N79-21 (RLIN) Always Below 1 Ω
      Z1-9 (RLIN) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK REAR CONTROL SWITCH


    1. Replace the rear control switch with a new or normally functioning one Click here.

      Tech Tips

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

      OK
      rear control switch operation returns to normal.
      Result
      Result Proceed to
      NG A
      OK (When troubleshooting according to Problem Symptoms Table) B
      OK (When troubleshooting according to the DTC) C

    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

    END (REAR CONTROL SWITCH WAS DEFECTIVE)