- Rear room temperature sensor
- Harness or connector between rear air conditioning room temperature sensor and air conditioning amplifier
- Air conditioning amplifier
| 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 |
B1419/19 |
Rear Room Temperature Sensor Circuit |
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 |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1419/19 |
Rear room temperature sensor circuit (Open or short) |
|
WIRING DIAGRAM
PROCEDURE
|
1. |
READ VALUE USING AIR CONDITIONING AMPLIFIER ASSEMBLY |
(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 |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Room Temp Sensor (Rear) |
Rear room temperature sensor / Min.: -6.5°C (20.3°F) Max.: 57.25°C (135.05°F) |
Actual cabin temperature is 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 column.
Result
|
Result |
Proceed to |
|---|---|
|
NG |
A |
|
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) |
B |
|
OK (When troubleshooting according to the DTC) |
C |
| B |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| C |
|
|
|
2. |
INSPECT REAR ROOM TEMPERATURE SENSOR |
(a) Remove the rear room temperature sensor.
|
*a |
Component without harness connected (to Rear Room Temperature Sensor) |
- |
- |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K11-1 - K11-2 |
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:
- 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).
| NG |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (REAR ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER) |
(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 |
Condition |
Specified Condition |
|---|---|---|
|
D186-20 (TR) - K11-1 |
Always |
Below 1 Ω |
|
D186-8 (RGND) - K11-2 |
Always |
Below 1 Ω |
|
D186-20 (TR) - Body ground |
Always |
10 kΩ or higher |
|
D186-8 (RGND) - Body ground |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|