SEAT HEATER SYSTEM, Diagnostic DTC:B14B3

DTC Code DTC Name
B14B3 Lost Communication with Rear Panel LIN

DESCRIPTION

The refreshing seat switch (for rear side)*1 or rear seat heater switch*2 sends signals to the air conditioning amplifier assembly via LIN communication.

If the LIN communication system is malfunctioning, the air conditioning amplifier assembly will not operate even if the refreshing seat switch (for rear side)*1 or rear seat heater switch*2 is operated.


DTC No. Detection Item DTC Detection Condition Trouble Area
B14B3 Lost Communication with Rear Panel LIN Lost communication with refreshing seat switch (for Rear Side)*1 or rear seat heater switch*2

  • Refreshing seat switch (for rear side)*1

  • Rear seat heater switch*2

  • Air conditioning amplifier assembly

  • Wire harness or connector

WIRING DIAGRAM

B005PBUE29

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B14B3 is not output.
      Result
      Result Proceed to
      OK A
      NG (w/o Rear No. 2 Seat) B
      NG (w/ Rear No. 2 Seat) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - REAR SEAT HEATER SWITCH - BODY GROUND) Click here

    B

  3. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - REFRESHING SEAT SWITCH (FOR REAR SIDE) - BODY GROUND)


    1. B005NMDC03
      *a

      Front view of wire harness connector

      (to Refreshing Seat Switch (for Rear Side))

      Disconnect the J15 refreshing seat switch (for rear side) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J15-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      J15-1 (IG) - Body ground Engine switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      J15-5 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - REFRESHING SEAT SWITCH (FOR REAR SIDE))


    1. Disconnect the J48 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
      J48-24 (RLIN) - J15-3 (RLIN) Always Below 1 Ω
      J48-24 (RLIN) or J15-3 (RLIN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE REFRESHING SEAT SWITCH (FOR REAR SIDE)


    1. Temporarily replace the refreshing seat switch (for rear side) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B14B3 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (REFRESHING SEAT SWITCH (FOR REAR SIDE) WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  8. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - REAR SEAT HEATER SWITCH - BODY GROUND)


    1. B005NMDC06
      *a

      Front view of wire harness connector

      (to Rear Seat Heater Switch)

      Disconnect the V6 rear seat heater switch connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      V6-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      V6-1 (IG) - Body ground Engine switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      V6-5 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - REAR SEAT HEATER SWITCH)


    1. Disconnect the J48 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
      J48-24 (RLIN) - V6-3 (RLIN) Always Below 1 Ω
      J48-24 (RLIN) or V6-3 (RLIN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. REPLACE REAR SEAT HEATER SWITCH


    1. Temporarily replace the rear seat heater switch with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  12. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B14B3 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (REAR SEAT HEATER SWITCH WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here