Dtc B14B2 Lost Communication With Front Panel Lin

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Heating Air Conditioning. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BATTERY AND BODY GROUND)

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

CHECK AIR CONDITIONING CONTROL ASSEMBLY

DTC B14B2 Lost Communication with Front Panel LIN


DESCRIPTION

The air conditioning control 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 air conditioning control assembly is operated.

DTC No.
DTC Detection Condition
Trouble Area
B14B2
Lost communication with the air conditioning control assembly
  1. Air conditioning control assembly
  2. Air conditioning amplifier
  3. LIN communication system
  4. Harness or connector

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B14B2 Lost Communication With Front Panel Lin


INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BATTERY AND BODY GROUND)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B14B2 Lost Communication With Front Panel Lin

  1. Disconnect the F10 air conditioning control assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    F10-1 (GND) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    F10-7 (IG+) - Body ground
    		Ignition switch off
    		Below 1 V
    Ignition switch ON
    		11 to 14 V
Text in Illustration
*a
Front view of wire harness connector
(to Air Conditioning Control Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

  1. Disconnect the F10 air conditioning control assembly connector.

  1. Disconnect the E81 air conditioning amplifier assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    F10-5 (LIN1) - E81-37 (LIN1)
    		Always
    		Below 1 Ω
    F10-5 (LIN1) or E81-37 (LIN1) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK AIR CONDITIONING CONTROL ASSEMBLY

  1. Replace the air conditioning control assembly with a new or known good one (Click here).

  1. When troubleshooting according to the DTC:

    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      OK:
      DTC B14B2 is not output.

  1. When troubleshooting according to Problem Symptoms Table:

    1. Check the air conditioning control assembly operates normally.

      HINT:
      Since the air conditioning control assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning control assembly with a new or known good one and check that the condition returns to normal.
      OK:
      Air conditioning control assembly operation returns to normal.


B
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

C
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)
A

END (AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE)