Heating Air Conditioning. 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 INTELLIGENT TESTER (AIR CONDITIONER)

INSPECT REAR ROOM TEMPERATURE SENSOR

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

DTC B1419/19 Rear Room Temperature Sensor Circuit

DESCRIPTION

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

DTC Code	DTC Detection Condition	Trouble Area
B1419/19	An open or short in the rear room temperature sensor LH1 or RH2 circuit.	Rear room temperature sensor LH1 Rear room temperature sensor RH2 Harness or connector between rear room temperature sensor LH and air conditioning amplifier assembly1 Harness or connector between rear room temperature sensor RH and air conditioning amplifier assembly2 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
B1419/19 Rear Room Temperature Sensor Circuit

INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (AIR CONDITIONER)

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

Air Conditioner
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Room Temp Sensor (Rear)	Rear room temperature sensor for LH1 or RH2 / Min.: -6.5°C (20.3°F) Max.: 57.25°C (135.05°F)	Actual rear room temperature for LH1 or RH2 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.

Go to step 2

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

2.INSPECT REAR ROOM TEMPERATURE SENSOR

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

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

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

REPLACE REAR ROOM TEMPERATURE SENSOR LH (Click here)

REPLACE REAR ROOM TEMPERATURE SENSOR RH (Click here)

A

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

for LHD
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
  z55-1 (+) - E35-18 (TR)
  Always
  Below 1 Ω
  z55-2 (-) - E35-2 (SG-6)
  E35-18 (TR) - Body ground
  Always
  10 kΩ or higher
  E35-2 (SG-6) - Body ground

for RHD
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

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

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

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