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 > Camshaft Oil Control Solenoid (for Bank 1): Components
    COMPONENTS ILLUSTRATION *1 CAMSHAFT TIMING OIL CONTROL SOLENOID ASSEMBLY (for Intake Side of Bank 1) *2 CAMSHAFT TIMING OIL CONTROL SOLENOID ASSEMBLY (for Exhaust Side of Bank 1) *3 O-RING - - N*m (kgf*cm, ft.*lbf): Specified torque ● Non-reusable part Adhesiv ...

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Intuitive Parking Assist System (w/ Intelligent Clearance Sonar System): Customize Parameters
    CUSTOMIZE PARAMETERS CUSTOMIZE INTUITIVE PARKING ASSIST SYSTEM (a) Customizing with the Techstream. NOTICE: When the customer requests a change in a function, first make sure that the function can be customized. Be sure to make a note of the current settings before customizing. When troublesh ...

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

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

    © 2025 Copyright www.lexusrx.net
    0.0143