AIR CONDITIONING SYSTEM, Diagnostic DTC:B14B3

DTC Code DTC Name
B14B3 Lost Communication with Rear Panel LIN

DESCRIPTION

The cooler control switch assembly 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 cooler control switch assembly is operated.

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

  • Harness or connector between cooler control switch assembly and IG circuit

  • Harness or connector between cooler control switch assembly and body ground

  • LIN communication system

  • Cooler control switch assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01ET2WE05

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (COOLER CONTROL SWITCH ASSEMBLY - IG CIRCUIT)


    1. Disconnect the X1 cooler control switch assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      X1-7 (IG+) - Body ground Ignition switch off Below 1 V
      X1-7 (IG+) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X1-16 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the I77 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
      X1-10 (RLIN) - I77-37 (LIN1) Always Below 1 Ω
      X1-10 (RLIN) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE COOLER CONTROL SWITCH ASSEMBLY


    1. Replace the cooler control switch assembly Click here.

      Tech Tips

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

      OK
      Cooler control switch assembly operation returns to normal.
      Result
      Result Proceed to
      OK A
      NG (When troubleshooting according to Problem Symptoms Table) B
      NG (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 (COOLER CONTROL SWITCH ASSEMBLY WAS DEFECTIVE)