Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Rain Sensor Malfunction (B1400)

Lexus RX (RX 350L, RX450h) 2016-2026 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) 2016-2026 Repair Manual > Valve Body Assembly: Components
    COMPONENTS ILLUSTRATION *1 FRONT WHEEL OPENING EXTENSION PAD LH *2 NO. 3 ENGINE UNDER COVER *3 FRONT FENDER APRON SEAL LH - - ILLUSTRATION *1 REFILL PLUG *2 DRAIN PLUG *3 OVERFLOW PLUG *4 GASKET *5 O-RING - - Tightening torque for "Major ar ...

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Outer Mirror Control Ecu: Removal
    REMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH side and LH side. The following procedure is for the LH side. PROCEDURE 1. REMOVE FRONT DOOR INSIDE HANDLE BEZEL PLUG Click here 2. REMOVE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WITH FRONT DOOR UPPER ARMREST BASE ...

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

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

    © 2026 Copyright www.lexusrx.net
    0.0088