Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001FPE6
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 -           ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): B1413; Evaporator Temperature Circuit or Evaporator Fin Thermistor; 2019 - 2024 MY RAV4 [11/2018 -        ]

DTC

B1413

Evaporator Temperature Circuit or Evaporator Fin Thermistor

DESCRIPTION

The No. 1 cooler thermistor is installed to the evaporator in the air conditioning unit to detect the temperature of the cooled air that has passed through the evaporator, which is used to control the air conditioning system. It sends signals to the air conditioning amplifier assembly. The resistance of the No. 1 cooler thermistor changes in accordance with the temperature of the cooled air that has passed through the evaporator. 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 No. 1 cooler thermistor and reads voltage changes as the resistance of the No. 1 cooler thermistor changes. This sensor is used for frost prevention.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1413

Evaporator Temperature Sensor Circuit

  • Diagnosis condition: None
  • Malfunction status: Open or short in evaporator temperature sensor circuit
  • Detection time: None (Present malfunction), continuously for 4 seconds or more (Past malfunction)
  • No. 1 cooler thermistor
  • Air conditioning harness assembly
  • Air conditioning amplifier assembly

Memorized

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING TECHSTREAM (EVAPORATOR FIN THERMISTOR)

(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

Evaporator Fin Thermistor

No. 1 cooler thermistor

Min.: -29.70°C (-21.46°F)

Max.: 59.55°C (139.19°F)

Actual evaporator temperature displayed

No. 1 cooler thermistor system malfunction

  • When open circuit: -29.70°C (-21.46°F)
  • When short circuit: 59.55°C (139.19°F)

Body Electrical > Air Conditioner > Data List

Tester Display

Evaporator Fin Thermistor

OK:

The display is as specified in the normal condition column.

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

2.

INSPECT NO. 1 COOLER THERMISTOR

(a) Remove the No. 1 cooler thermistor.

Click here 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]; HEATING / AIR CONDITIONING: FRONT EVAPORATOR TEMPERATURE SENSOR: REMOVAL 2019 - 2024 MY RAV4 RAV4 HV [02/2019 -        ]; HEATING / AIR CONDITIONING: FRONT EVAPORATOR TEMPERATURE SENSOR: REMOVAL

(b) Inspect the No. 1 cooler thermistor.

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

NG

REPLACE NO. 1 COOLER THERMISTOR 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]; HEATING / AIR CONDITIONING: FRONT EVAPORATOR TEMPERATURE SENSOR: REMOVAL 2019 - 2024 MY RAV4 RAV4 HV [02/2019 -        ]; HEATING / AIR CONDITIONING: FRONT EVAPORATOR TEMPERATURE SENSOR: REMOVAL

OK

3.

INSPECT AIR CONDITIONING HARNESS ASSEMBLY

(a) Remove the air conditioning harness assembly.

Click here 2019 - 2020 MY RAV4 [11/2018 - 08/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FKS): DISASSEMBLY 2021 - 2024 MY RAV4 [08/2020 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FKS): DISASSEMBLY

*a

Front view of air conditioning harness assembly connector

(to Air Conditioning Amplifier Assembly)

*b

Front view of air conditioning harness assembly connector

(to No. 1 Cooler Thermistor)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z11-6 (TEA) - 2

Always

Below 1 Ω

z11-5 (SGA) - 1

Always

Below 1 Ω

z11-6 (TEA) or 2 - Other terminals and body ground

Always

10 kΩ or higher

z11-5 (SGA) or 1 - Other terminals and body ground

Always

10 kΩ or higher

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPLACE AIR CONDITIONING HARNESS ASSEMBLY 2019 - 2020 MY RAV4 [11/2018 - 08/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FKS): DISASSEMBLY 2021 - 2024 MY RAV4 [08/2020 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FKS): DISASSEMBLY