Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Rain Sensor Malfunction (B1400)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Exterior / Wiper / Washer / Wiper And Washer System / Rain Sensor Malfunction (B1400)

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
  • When the battery voltage is 9.5 V or more, the rain sensor temperature is abnormal for 10 seconds or more.
  • When the battery voltage is 9.5 V or more, the output of the LED built into the rain sensor is abnormal for 2 seconds or more.

Rain Sensor

○

Rain Sensor

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Rain Sensor > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Turn the engine switch on (IG).

(b) Check for DTCs.

Click here

Body Electrical > Rain Sensor > Trouble Codes

Result

Proceed to

DTC B1400 is not output.

A

DTC B1400 is output.

B
A

USE SIMULATION METHOD TO CHECK

B

REPLACE RAIN SENSOR

    Lost Communication with Wiper System LIN BUS (B1373)
    DESCRIPTION The main body ECU (multiplex network body ECU) communicates with the windshield wiper motor and link assembly (wiper ECU), windshield wiper switch assembly and rain sensor via LIN communic ...

    Wiper Motor Power Source Circuit
    DESCRIPTION This circuit is the power source circuit for the combination meter assembly. This circuit provides two types of power sources; one is a constant power source, and the other is an IG power ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Automatic Transaxle System: How To Proceed With Troubleshooting
    CAUTION / NOTICE / HINT HINT: The ECM is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there are no malfunctions in the CAN communication system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NE ...

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Safety Connect System: Diagnosis System
    DIAGNOSIS SYSTEM DESCRIPTION (a) The DCM (telematics transceiver) control the vehicle safety connect system functions. Safety connect system data and Diagnostic Trouble Codes (DTCs) can be read through the vehicle Data Link Connector 3 (DLC3). In some cases, a malfunction may be occurring in the saf ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2025 Copyright www.lexusrx.net
    0.014