HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1411; Room Temperature Sensor Circuit; 2019 MY RAV4 HV [11/2018

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001FPGY
Model Year Start: 2019	Model: RAV4 HV	Prod Date Range: [11/2018 - 02/2019]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1411; Room Temperature Sensor Circuit; 2019 MY RAV4 HV [11/2018 - 02/2019]

DTC

B1411

Room Temperature Sensor Circuit

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) 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	Diagnosis condition: Ambient temperature is -30°C (-22°F) or more Malfunction status: Open or short in room temperature sensor circuit Detection time: None (Present malfunction), continuously for 4 seconds or more (Past malfunction)	Cooler thermistor (room temperature sensor) Harness or connector Air conditioning amplifier assembly	Memorized

HINT:

If the cabin temperature is approximately -18.6°C (-1.48°F) or lower, DTC B1411 may be output even though the system is normal.

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM (ROOM TEMPERATURE SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(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

Cooler thermistor (room temperature sensor) system malfunction

When open circuit: -6.50°C (20.30°F)
When short circuit: 57.25°C (135.05°F)

Body Electrical > Air Conditioner > Data List

Tester Display
Room Temperature Sensor

OK:

The display is as specified in the normal condition column.

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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

REPLACE COOLER THERMISTOR (ROOM TEMPERATURE SENSOR)

3.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - COOLER THERMISTOR (ROOM TEMPERATURE SENSOR))

(a) Disconnect the G47 air conditioning amplifier assembly connector.

(b) Disconnect the G60 cooler thermistor (room temperature sensor) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G47-5 (TR) - G60-1	Always	Below 1 Ω
G47-3 (SG-1) - G60-2	Always	Below 1 Ω
G47-5 (TR) or G60-1 - Other terminals and body ground	Always	10 kΩ or higher
G47-3 (SG-1) or G60-2 - Other terminals and body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR