Toyota Camry (XV70): Room Temperature Sensor Circuit (B1411)
DESCRIPTION
The cooler (room temp. sensor) thermistor 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 (room temp. sensor) thermistor 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 (room temp. sensor) thermistor and reads voltage changes due to changes in the resistance of the cooler (room temp. sensor) thermistor.
|
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Memory |
|---|---|---|---|---|
| B1411 |
Room Temperature Sensor Circuit |
Open or short in room temperature sensor circuit |
| Memorized (4 sec. or more)* |
- *: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.
HINT:
If the cabin temperature is approximately -18.6°C (-1.48°F) or lower, DTC B1411 may be stored even though the system is normal.
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 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 (room temp. sensor) thermistor |
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.
| OK | .gif) | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
|
|
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| 2. |
INSPECT COOLER (ROOM TEMP. SENSOR) THERMISTOR |
(a) Remove the cooler (room temp. sensor) thermistor.
Click here
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(b) Inspect the cooler (room temp. sensor) thermistor.
Click here
| NG | | REPLACE COOLER (ROOM TEMP. SENSOR) THERMISTOR |
|
| 3. |
CHECK HARNESS AND CONNECTOR (COOLER (ROOM TEMP. SENSOR) THERMISTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) Disconnect the K55 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 |
|---|---|---|
|
K67-1 (+) - K55-14 (TR) |
Always | Below 1 ? |
|
K67-2 (-) - K55-1 (SG-1) |
Always | Below 1 ? |
|
K67-1 (+) or K55-14 (TR) - Other terminals and body ground |
Always | 10 k? or higher |
|
K67-2 (-) or K55-1 (SG-1) - Other terminals and body ground |
Always | 10 k? or higher |
| OK | | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
|
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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SEE MORE:
Installation
INSTALLATION PROCEDURE 1. INSTALL NO. 2 CYLINDER HEAD GASKET
(a) Place a new No. 2 cylinder head gasket on the cylinder block sub-assembly as shown in the illustration.
*a Lot No.
Front of Engine
NOTICE:
Remove any oil from the contact surfaces.
Make sure t
Precaution
PRECAUTION PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL
NOTICE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected.
System Name See Procedure
Lane Tracing Assist System
