Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM100000000ZPD4 |
Model Year Start: 2017 |
Model: Sienna |
Prod Date Range: [08/2016 -
] |
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1419/19; Rear Room Temperature Sensor Circuit; 2017 - 2020 MY Sienna [08/2016 - ] |
DTC
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B1419/19
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Rear Room Temperature Sensor Circuit
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DESCRIPTION
This sensor detects the rear cabin temperature that is used as the basis for temperature control and sends a signal to the air conditioning amplifier.
DTC Code
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DTC Detection Condition
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Trouble Area
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B1419/19
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Rear room temperature sensor circuit (Open or short)
|
-
Rear room temperature sensor
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Harness or connector between rear air conditioning room temperature sensor and air conditioning amplifier
-
Air conditioning amplifier
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WIRING DIAGRAM
PROCEDURE
1.
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READ VALUE USING AIR CONDITIONING AMPLIFIER ASSEMBLY
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(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.
(e) Check the value(s) by referring to the table below.
Air Conditioner
Tester Display
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Measurement Item/Range
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Normal Condition
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Diagnostic Note
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Room Temp Sensor (Rear)
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Rear room temperature sensor /
Min.: -6.5°C (20.3°F)
Max.: 57.25°C (135.05°F)
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Actual cabin temperature is displayed
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Open in the circuit: -6.5°C (20.3°F)
Short in the circuit: 57.25°C (135.05°F)
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OK:
The display is as specified in the normal condition column.
Result
Result
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Proceed to
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NG
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A
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OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)
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B
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OK (When troubleshooting according to the DTC)
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C
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A
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|
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2.
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INSPECT REAR ROOM TEMPERATURE SENSOR
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(a) Remove the rear room temperature sensor.
*a
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Component without harness connected
(to Rear Room Temperature Sensor)
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-
|
-
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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K11-1 - K11-2
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10°C (50°F)
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3.00 to 3.73 kΩ
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15°C (59°F)
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2.45 to 2.88 kΩ
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20°C (68°F)
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1.95 to 2.30 kΩ
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25°C (77°F)
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1.60 to 1.80 kΩ
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30°C (86°F)
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1.28 to 1.47 kΩ
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35°C (95°F)
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1.00 to 1.22 kΩ
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40°C (104°F)
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0.80 to 1.00 kΩ
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45°C (113°F)
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0.65 to 0.85 kΩ
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50°C (122°F)
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0.50 to 0.70 kΩ
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55°C (131°F)
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0.44 to 0.60 kΩ
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60°C (140°F)
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0.36 to 0.50 kΩ
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NOTICE:
-
Hold the sensor only by its connector. Touching the sensor may change the resistance value.
-
When measuring, the sensor temperature must be the same as the rear cabin temperature.
HINT:
As the temperature increases, the resistance decreases (see the graph).
OK
|
|
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3.
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CHECK HARNESS AND CONNECTOR (REAR ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER)
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(a) Disconnect the D186 air conditioning amplifier connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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D186-20 (TR) - K11-1
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Always
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Below 1 Ω
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D186-8 (RGND) - K11-2
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Always
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Below 1 Ω
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D186-20 (TR) - Body ground
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Always
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10 kΩ or higher
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D186-8 (RGND) - Body ground
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Always
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10 kΩ or higher
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NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
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