Dtc B1468/68 Rear Passenger Side 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 TEMPERATURE SENSOR [RP])

INSPECT COOLER THERMISTOR (REAR ROOM TEMPERATURE SENSOR [for Front Passenger Side])

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

DTC B1468/68 Rear Passenger Side Room Temperature Sensor Circuit


DESCRIPTION

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

DTC Code
DTC Detection Condition
Trouble Area
B1468/68
An open or short in the cooler thermistor (rear room temperature sensor RH*1 or LH*2) circuit.
  1. Cooler thermistor (rear room temperature sensor RH)*1
  2. Cooler thermistor (rear room temperature sensor LH)*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 B1468/68 Rear Passenger Side Room Temperature Sensor Circuit


for RHD:

Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1468/68 Rear Passenger Side Room Temperature Sensor Circuit


INSPECTION PROCEDURE

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

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

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Room Temperature Sensor (RP)
    		Cooler thermistor (rear room temperature sensor RH*1 or LH*2) / Min.: -6.5°C (20.3°F), Max.: 57.25°C (135.05°F)
    		Cooler thermistor (rear room temperature RH*1 or LH*2) displayed
    		Cooler thermistor (rear room temperature RH*1 or LH*2)
    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.


NG
Go to step 2
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

2.INSPECT COOLER THERMISTOR (REAR ROOM TEMPERATURE SENSOR [for Front Passenger Side])

  1. Remove the cooler thermistor (rear room temperature sensor RH*1 or LH*2) (Click here)

  1. Inspect the cooler thermistor (rear room temperature sensor RH*1 or LH*2 (Click here).



NG
REPLACE COOLER THERMISTOR (REAR ROOM TEMPERATURE SENSOR [for Front Passenger Side]) (Click here)
OK


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

  1. for LHD:

    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
      z56-2 - E35-33 (SG)
      		Always
      		Below 1 Ω
      z56-1 - E35-22 (TSET)
      		Always
      		Below 1 Ω
      E35-33 (SG) - E35-22 (TSET)
      		Always
      		Below 1 Ω
      z56-2 or E35-33 (SG) - Body ground
      		Always
      		10 kΩ or higher
      z56-1 or E35-22 (TSET) - Body ground
      		Always
      		10 kΩ or higher

  1. for RHD:

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

    2. Disconnect the E35 air conditioning amplifier connector.

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

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      z56-2 - E35-33 (SG)
      		Always
      		Below 1 Ω
      z56-1 - E35-21 (TR)
      		Always
      		Below 1 Ω
      E35-33 (SG) - E35-21 (TR)
      		Always
      		Below 1 Ω
      z56-2 or E35-33 (SG) - Body ground
      		Always
      		10 kΩ or higher
      z56-1 or E35-21 (TR) - Body ground
      		Always
      		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)