Dtc B1419/19 Rear Room Temperature Sensor Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS (ROOM TEMP SENSOR [REAR])

INSPECT COOLER THERMISTOR (REAR ROOM TEMPERATURE SENSOR)

CHECK HARNESS AND CONNECTOR (COOLER THERMISTOR [REAR ROOM TEMPERATURE SENSOR] - AIR CONDITIONING AMPLIFIER ASSEMBLY)

DTC B1419/19 Rear Room Temperature Sensor Circuit


DESCRIPTION

  1. *1: for LHD
  2. *2: for RHD
The cooler thermistor (rear room temperature sensor LH*1 or RH*2) is installed in the rear quarter trim board LH*1 or RH*2 to detect the rear room temperature and control the heater and air conditioner "auto" mode. The resistance of the rear room temperature sensor LH*1 or RH*2 changes in accordance with the cooler thermistor (rear room temperature sensor LH*1or RH*2) seat. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.
The air conditioning amplifier assembly applies a voltage (5 V) to the cooler thermistor (rear room temperature sensor LH*1 or RH*2) and reads voltage changes as changes in the resistance of the cooler thermistor (rear room temperature sensor LH* or RH*2)

DTC Code
DTC Detection Condition
Trouble Area
B1419/19
An open or short in the cooler thermistor (rear room temperature sensor LH*1 or RH*2) circuit.
  1. Cooler thermistor (rear room temperature sensor LH)*1
  2. Cooler thermistor (rear room temperature sensor RH)*2
  3. Harness or connector
  4. Air conditioning amplifier assembly

WIRING DIAGRAM


for LHD:

Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1419/19 Rear Room Temperature Sensor Circuit


for RHD:

Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1419/19 Rear Room Temperature Sensor Circuit


INSPECTION PROCEDURE

1.READ VALUE USING GTS (ROOM TEMP SENSOR [REAR])
  1. *1: for LHD
  2. *2: for RHD

  1. Use the Data List to check if the rear room temperature sensor LH*1 or RH*2 is functioning properly (Click here).

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Room Temp Sensor (Rear)
    		Cooler thermistor (rear room temperature sensor for LH*1,RH*2) / Min.: -6.5°C (20.3°F), Max.: 57.25°C (135.05°F)
    		Actual rear room temperature for LH*1 or RH*2 displayed
    		Cooler thermistor (rear room temperature sensor for LH*1 or RH*2) system malfunction:
    1. Open in the circuit: -6.5°C (20.3°F)
    2. Short in the circuit: 57.25°C (135.05°F)
    OK:
    The display is as specified in the normal condition.
    Result
    Result
    		Proceed to
    OK (When troubleshooting according to the DTC)
    		A
    OK (When troubleshooting according to Problem Symptoms Table)
    		B
    NG
    		C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

C
Go to step 2
A

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

2.INSPECT COOLER THERMISTOR (REAR ROOM TEMPERATURE SENSOR)

  1. for LHD:

    1. Remove the cooler thermistor (rear room temperature sensor LH) (Click here).

  1. for RHD

    1. Remove the cooler thermistor (rear room temperature sensor RH) (Click here).

  1. Inspect the cooler thermistor (rear room temperature sensor) (Click here).

    Result
    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C


B
REPLACE COOLER THERMISTOR (REAR ROOM TEMPERATURE SENSOR LH) (Click here)

C
REPLACE COOLER THERMISTOR (REAR ROOM TEMPERATURE SENSOR RH) (Click here)
A


3.CHECK HARNESS AND CONNECTOR (COOLER THERMISTOR [REAR ROOM TEMPERATURE SENSOR] - AIR CONDITIONING AMPLIFIER ASSEMBLY)

  1. for LHD:

    1. Disconnect the z55 cooler thermistor (rear room temperature sensor LH) connector.

    2. Disconnect the E35 air conditioning amplifier assembly connector.

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

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      z55-1 - E35-21 (TR)
      		Always
      		Below 1 Ω
      z55-2 - E35-33 (SG)
      		Always
      		Below 1 Ω
      z55-1 - z55-2
      		Always
      		10 kΩ or higher
      z55-1 or E35-21 (TR) - Body ground
      		Always
      		10 kΩ or higher
      z55-2 or E35-33 (SG) - Body ground
      		Always
      		10 kΩ or higher

  1. for RHD:

    1. Disconnect the z56 cooler thermistor (rear room temperature sensor RH) connector.

    2. Disconnect the E35 air conditioning amplifier assembly connector.

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

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      z56-1 - E35-22 (TEST)
      		Always
      		Below 1 Ω
      z56-2 - E35-33 (SG)
      		Always
      		Below 1 Ω
      z55-1 - z55-2
      		Always
      		10 kΩ or higher
      z56-1 or E35-22 (TEST) - Body ground
      		Always
      		10 kΩ or higher
      z56-2 or E35-33 (SG) - Body ground
      		Always
      		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)