DESCRIPTION
The cooler thermistor (room temperature sensor) is installed in the instrument panel to detect the cabin temperature, which is used to control the air conditioning system. The resistance of the cooler thermistor (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 air conditioning amplifier assembly applies voltage (5 V) to the cooler thermistor (room temperature sensor) thermistor and reads voltage changes due to changes in the resistance of the cooler thermistor (room temperature sensor).
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Memory |
---|---|---|---|---|
B1411 |
Room Temperature Sensor Circuit |
Any of the following conditions is met:
|
|
Memorized (4 seconds or more)* |
HINT:
If the cabin temperature is approximately -56.0°C (-68.8°F) or lower, DTC B1411 may be output even though the system is normal.
DTC Detection Conditions
Vehicle Condition |
|||
---|---|---|---|
Pattern 1 |
Pattern 2 |
||
Diagnosis Condition |
Ignition switch ON |
○ |
○ |
Malfunction Status |
Open in cooler thermistor (room temp. sensor) circuit |
○ |
- |
Short in cooler thermistor (room temp. sensor) circuit |
- |
○ |
|
Detection Time |
4 seconds or more |
4 seconds or more |
|
Number of Trips |
1 trip |
1 trip |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
WIRING DIAGRAM
PROCEDURE
1. |
READ VALUE USING TECHSTREAM (ROOM TEMPERATURE SENSOR) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Air Conditioner > Data List
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|---|
Room Temperature Sensor |
Cooler thermistor (room temperature sensor) |
Min.: -6.50°C (20.30°F) Max.: 57.25°C (135.05°F) |
Actual cabin temperature displayed |
- |
Tester Display |
---|
Room Temperature Sensor |
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 | ![]() |
GO TO STEP 4 |
|
2. |
INSPECT COOLER THERMISTOR (ROOM TEMPERATURE SENSOR) |
(a) Remove the cooler thermistor (room temperature sensor).
Click here
(b) Inspect the cooler thermistor (room temperature sensor).
Click here
NG | ![]() |
REPLACE COOLER THERMISTOR (ROOM TEMPERATURE SENSOR) |
|
3. |
CHECK HARNESS AND CONNECTOR (COOLER THERMISTOR (ROOM TEMPERATURE SENSOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) Disconnect the F72 air conditioning amplifier assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F72-30 (TR) - F60-1 |
Always |
Below 1 Ω |
F72-31 (SG-1) - F60-2 |
Always |
Below 1 Ω |
F72-30 (TR) or F60-1 - Body ground |
Always |
10 kΩ or higher |
F72-31 (SG-1) or F60-2 - Body ground |
Always |
10 kΩ or higher |
OK | ![]() |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
4. |
CHECK FOR DTC |
(a) Clear the DTCs.
Click here
(b) Check for DTCs.
Click here
Result |
Proceed to |
---|---|
DTCs are not output |
A |
DTCs are output |
B |
A | ![]() |
USE SIMULATION METHOD TO CHECK |
B | ![]() |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
Toyota CH-R Service Manual > Occupant Classification System: Dtc Check / Clear
DTC CHECK / CLEAR
DTC CHECK
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON, and wait for at least 10 seconds.
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / Occupant Detection / Trouble
Codes.
Body E ...
Toyota CH-R Service Manual > Audio And Visual System(for Radio And Display Type): Speaker Circuit
DESCRIPTION
If there is a short in a speaker circuit, the radio and display receiver assembly
detects it and stops output to the speakers.
Thus sound cannot be heard from the speakers even if there is no malfunction
in the radio and display receiver assembly, DCM (telematics transceiver)*1 or ...