Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - HEATING / AIR CONDITIONING
READ VALUE USING INTELLIGENT TESTER (FRONT ROOM TEMPERATURE SENSOR)
INSPECT ROOM TEMPERATURE SENSOR
CHECK HARNESS AND CONNECTOR (FRONT ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER)
DTC B1411/11 Room Temperature Sensor Circuit
DESCRIPTION
The front room temperature sensor for the front seat is installed in the instrument panel to detect the room temperature and control the heater and air conditioner "auto" mode. The resistance of the room temperature sensor changes in accordance with the front room temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.
The air conditioning amplifier assembly applies voltage (5 V) to the front room temperature sensor and reads voltage changes as the resistance of the front room temperature sensor changes. This sensor also sends the appropriate signals to the air conditioning amplifier assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
| B1411/11 | An open or short in the front room temperature sensor circuit. | Front room temperature sensor Harness or connector between room temperature sensor and air conditioning amplifier assembly Air conditioning amplifier assembly |
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.READ VALUE USING INTELLIGENT TESTER (FRONT ROOM TEMPERATURE SENSOR) |
Use the Data List to check if the front room temperature sensor is functioning properly.
| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| Room Temperature Sensor | Front room temperature sensor / Min.: -6.5°C (20.3°F) Max.: 57.25°C (135.05°F) |
Actual room temperature for front seat displayed | Open in the circuit: -6.5°C (20.3°F). Short in the circuit: 57.25°C (135.05°F). |
- OK:
- The display is as specified in the normal condition.
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| OK | ||
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| 2.INSPECT ROOM TEMPERATURE SENSOR |
Remove the front room temperature sensor ().
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:
- HINT:
- As the temperature increases, the resistance decreases (see the graph).
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| OK | |
| 3.CHECK HARNESS AND CONNECTOR (FRONT ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER) |
w/ Rear Heater
Disconnect the E32 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 E32-1 (+) - E35-9 (TR) Always Below 1 Ω E32-2 (-) - E35-32 (SG-1) E35-9 (TR) - Body ground Always 10 kΩ or higher E35-32 (SG-1) - Body ground
w/o Rear Heater
Disconnect the E32 sensor connector.
Disconnect the E81 amplifier connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition E32-1 (+) - E81-29 (TR) Always Below 1 Ω E32-2 (-) - E81-34 (SG-1) E81-29 (TR) - Body ground Always 10 kΩ or higher E81-34 (SG-1) - Body ground
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| OK | ||
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