Last Modified: 05-08-2025 6.11:8.1.0 Doc ID: RM100000001JJPL
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 -           ]
Title: WIPER / WASHER: WIPER AND WASHER SYSTEM: B1400; Rain Sensor Malfunction; 2019 - 2025 MY RAV4 RAV4 HV [11/2018 -        ]

DTC

B1400

Rain Sensor Malfunction

DESCRIPTION

This DTC is stored when the rain sensor detects an internal malfunction.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

DTC Output from

B1400

Rain Sensor Malfunction

Detection Condition:

  • IG power source voltage is 9.5 V or more

Malfunction Status:

  • Either of the following is detected
    • Rain sensor internal thermistor malfunction detected for 10 seconds or more
    • LED output malfunction detected for 2 seconds or more

Rain sensor

○

Rain and/or Humidity Sensor

PROCEDURE

1.

CHECK FOR DTC

(a) Clear the DTCs.

Click here 2019 - 2023 MY RAV4 RAV4 HV [11/2018 - 10/2023]; WIPER / WASHER: WIPER AND WASHER SYSTEM: DTC CHECK / CLEAR 2024 MY RAV4 RAV4 HV [10/2023 - 11/2024]; WIPER / WASHER: WIPER AND WASHER SYSTEM: DTC CHECK / CLEAR 2025 MY RAV4 RAV4 HV [11/2024 -        ]; WIPER / WASHER: WIPER AND WASHER SYSTEM: DTC CHECK / CLEAR

Body Electrical > Rain and/or Humidity Sensor > Clear DTCs

(b) Wait 10 seconds or more.

(c) Check for DTCs.

Click here 2019 - 2023 MY RAV4 RAV4 HV [11/2018 - 10/2023]; WIPER / WASHER: WIPER AND WASHER SYSTEM: DTC CHECK / CLEAR 2024 MY RAV4 RAV4 HV [10/2023 - 11/2024]; WIPER / WASHER: WIPER AND WASHER SYSTEM: DTC CHECK / CLEAR 2025 MY RAV4 RAV4 HV [11/2024 -        ]; WIPER / WASHER: WIPER AND WASHER SYSTEM: DTC CHECK / CLEAR

Body Electrical > Rain and/or Humidity Sensor > Trouble Codes

OK:

DTC B1400 is not output

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE RAIN SENSOR