Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - HEATING / AIR CONDITIONING
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 LH*1 or RH*2 circuit. | Rear room temperature sensor LH*1 Rear room temperature sensor RH*2 Harness or connector between rear room temperature sensor LH and air conditioning amplifier assembly*1 Harness or connector between rear room temperature sensor RH and air conditioning amplifier assembly*2 Air conditioning amplifier assembly |
- HINT:
- *1: for LHD
- *2: for RHD
WIRING DIAGRAM
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.
| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| Room Temp Sensor (Rear) | Rear room temperature sensor for LH*1 or 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 | 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.
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| OK | ||
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| 2.INSPECT REAR ROOM TEMPERATURE SENSOR |
for LHD
Remove the rear room temperature sensor LH ().
for RHD
Remove the rear room temperature sensor RH ().
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 | Proceed to |
| OK | A |
| NG (for LHD) | B |
| NG (for RHD) | C |
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| A | |
| 3.CHECK HARNESS AND CONNECTOR (REAR ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER) |
for LHD
Disconnect the z55 sensor connector.
Disconnect the E35 amplifier connector.
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
Disconnect the z56 sensor connector.
Disconnect the E35 amplifier connector.
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
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| OK | ||
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