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).

(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

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.

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

2.

INSPECT COOLER THERMISTOR (ROOM TEMPERATURE SENSOR)

(a) Remove the cooler thermistor (room temperature sensor).

Click here 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]; HEATING / AIR CONDITIONING: ROOM TEMPERATURE SENSOR: REMOVAL

(b) Inspect the cooler thermistor (room temperature sensor).

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; HEATING / AIR CONDITIONING: ROOM TEMPERATURE SENSOR: INSPECTION

NG

REPLACE COOLER THERMISTOR (ROOM TEMPERATURE SENSOR)

OK

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.

(c) Measure the resistance according to the value(s) in the table below.

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

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR