DESCRIPTION
The room temperature sensor is installed in the instrument panel. It detects the cabin temperature to control the air conditioning AUTO mode. The resistance of the room temperature sensor changes in accordance with the cabin temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.
The A/C amplifier applies voltage (5 V) to the room temperature sensor and reads voltage changes as the resistance of the room temperature sensor changes. This sensor also sends appropriate signals to the A/C amplifier.
DTC No. |
DTC Detection condition |
Trouble Area |
---|---|---|
B1411/11 |
Open or short in room temperature sensor circuit |
|
WIRING DIAGRAM
PROCEDURE
1. |
READ VALUE USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body / 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 Temperature Sensor |
Room temperature sensor / Min.: -6.5°C (20.3°F) Max.: 57.25°C (135.05°F) |
Actual cabin temperature displayed |
- |
OK:
The display is as specified in the Normal Condition column.
Result |
Proceed to |
---|---|
NG |
A |
OK (When troubleshooting according to Problem Symptoms Table) |
B |
OK (When troubleshooting according to the DTC) |
C |
B | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
C | ![]() |
REPLACE A/C AMPLIFIER |
|
2. |
INSPECT ROOM TEMPERATURE SENSOR |
(a) Remove the room temperature sensor.
(b) Disconnect the room temperature sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D11-1 - D11-2 |
10°C (50°F) |
3.00 to 3.73 kΩ |
D11-1 - D11-2 |
15°C (59°F) |
2.45 to 2.88 kΩ |
D11-1 - D11-2 |
20°C (68°F) |
1.95 to 2.30 kΩ |
D11-1 - D11-2 |
25°C (77°F) |
1.60 to 1.80 kΩ |
D11-1 - D11-2 |
30°C (86°F) |
1.28 to 1.47 kΩ |
D11-1 - D11-2 |
35°C (95°F) |
1.00 to 1.22 kΩ |
D11-1 - D11-2 |
40°C (104°F) |
0.80 to 1.00 kΩ |
D11-1 - D11-2 |
45°C (113°F) |
0.65 to 0.85 kΩ |
D11-1 - D11-2 |
50°C (122°F) |
0.50 to 0.70 kΩ |
D11-1 - D11-2 |
55°C (131°F) |
0.44 to 0.60 kΩ |
D11-1 - D11-2 |
60°C (140°F) |
0.36 to 0.50 kΩ |
NOTICE:
HINT:
As the temperature increases, the resistance decreases (see the graph).
Text in Illustration
*1 |
Component without harness connected (Room Temperature Sensor) |
*2 |
Sensing Portion |
NG | ![]() |
REPLACE ROOM TEMPERATURE SENSOR |
|
3. |
CHECK HARNESS AND CONNECTOR (ROOM TEMPERATURE SENSOR - A/C AMPLIFIER) |
(a) Disconnect the A/C amplifier connector. |
|
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
OK | ![]() |
REPLACE A/C AMPLIFIER |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Meter Illumination does not Dim at Night
DESCRIPTION
In this circuit, the meter CPU receives auto dimmer signals from the main body
ECU (driver side junction block assembly) using the CAN communication system (CAN
No. 1 Bus). When the meter CPU receives an auto dimmer signal, it dims the meter
...
Hydraulic Test
HYDRAULIC TEST
1. PERFORM HYDRAULIC TEST
(a) Measure the line pressure.
CAUTION:
The line pressure test should always be carried out with at least 2 people. One
person should observe the condition of wheels and wheel chocks while the other is
perform ...
Horn Circuit
DESCRIPTION
When the theft deterrent system is switched from the armed state to the alarm
sounding state, the main body ECU (driver side junction block assembly) transmits
a signal to cause the horn to sound at intervals of 0.4 seconds.
WIRING DIAGRAM
...