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 INTELLIGENT TESTER (AIR CONDITIONER)

INSPECT REAR ROOM TEMPERATURE SENSOR

CHECK HARNESS AND CONNECTOR (REAR ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER)

DTC B1468/68 Rear Passenger Side Room Temperature Sensor Circuit


DESCRIPTION

The rear room temperature sensor RH*1 or LH*2 (for front passenger side) 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 rear room temperature for 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 rear room temperature sensor RH*1 or LH*2 and reads voltage changes as changes in the resistance of the rear room temperature sensor RH*1 or LH*2.

DTC Code
DTC Detection Condition
Trouble Area
B1468/68
An open or short in the rear room temperature sensor RH*1 or LH*2 circuit.
  1. Rear room temperature sensor RH*1
  2. Rear room temperature sensor LH*2
  3. Harness or connector between rear room temperature sensor RH and air conditioning amplifier assembly*1
  4. Harness or connector between rear room temperature sensor LH and air conditioning amplifier assembly*2
  5. Air conditioning amplifier assembly
HINT:
*1: for LHD
*2: for RHD

WIRING DIAGRAM


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


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 INTELLIGENT TESTER (AIR CONDITIONER)

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

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Room Temperature Sensor (RP)
    		Rear room temperature sensor for RH*1 or LH*2 /
    Min.: -6.5°C (20.3°F)
    Max.: 57.25°C (135.05°F)
    		Actual rear room temperature for RH*1 or LH*2 displayed
    		Open in the circuit: -6.5°C (20.3°F).
    Short in the circuit: 57.25°C (135.05°F).
    HINT:
    *1: for LHD
    *2: for RHD
    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 REAR ROOM TEMPERATURE SENSOR
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

  1. for LHD
    Remove the rear room temperature sensor RH (Click here).

  1. for RHD
    Remove the rear room temperature sensor LH (Click here).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (+) - 2 (-)
    		10°C (50°F)
    		3.00 to 3.73 kΩ
    15°C (59°F)
    		2.45 to 2.88 kΩ
    20°C (68°F)
    		1.95 to 2.30 kΩ
    25°C (77°F)
    		1.60 to 1.80 kΩ
    30°C (86°F)
    		1.28 to 1.47 kΩ
    35°C (95°F)
    		1.00 to 1.22 kΩ
    40°C (104°F)
    		0.80 to 1.00 kΩ
    45°C (113°F)
    		0.65 to 0.85 kΩ
    50°C (122°F)
    		0.50 to 0.70 kΩ
    55°C (131°F)
    		0.44 to 0.60 kΩ
    60°C (140°F)
    		0.36 to 0.50 kΩ
    NOTICE:
    Even slightly touching the sensor may change the resistance value. Be sure to hold the connector of the sensor.
    HINT:
    As the temperature increases, the resistance decreases (see the graph).
    Result
    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C


B
REPLACE REAR ROOM TEMPERATURE SENSOR RH (Click here)

C
REPLACE REAR ROOM TEMPERATURE SENSOR LH (Click here)
A


3.CHECK HARNESS AND CONNECTOR (REAR ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER)
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
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

  1. for LHD

    1. Disconnect the z56 sensor connector.

    2. Disconnect the E35 amplifier connector.

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

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      z56-2 (-)- E35-2 (SG-6)
      		Always
      		Below 1 Ω
      z56-1 (+) - E35-19 (TR7)
      E35-2 (SG-6) - Body ground
      		Always
      		10 kΩ or higher
      E35-19 (TR7) - Body ground

  1. for RHD

    1. Disconnect the z55 sensor connector.

    2. Disconnect the E35 amplifier connector.

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

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      z55-2 (-) - E35-2 (SG-6)
      		Always
      		Below 1 Ω
      z55-1 (+) - E35-18 (TR)
      E35-2 (SG-6) - Body ground
      		Always
      		10 kΩ or higher
      E35-18 (TR) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)