Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Motor Control Relay Stuck ON (B2345)

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual / Vehicle Exterior / Sliding Roof / Convertible / Panoramic Moon Roof System / Motor Control Relay Stuck ON (B2345)

DESCRIPTION

This DTC will be stored if the operation of the sliding roof or roof sunshade is suspended and a pulse input of 10 Hz or more is detected when the motor relay is off.

Sliding Roof

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B2345

Motor Control Relay Stuck ON

Position failure (When the sliding roof ECU (sliding roof drive gear assembly) enters fail-safe mode due to a problem with the gear position)

Sliding roof ECU (Sliding roof drive gear assembly)
Sliding Sunshade

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B2345

Motor Control Relay Stuck ON

Position failure (When the roof sunshade ECU (sliding roof drive gear assembly) enters fail-safe mode due to a problem with the gear position)

Roof sunshade ECU (Sliding roof drive gear assembly)

CAUTION / NOTICE / HINT

NOTICE:

  • If the sliding roof ECU (sliding roof drive gear assembly) or roof sunshade ECU (sliding roof drive gear assembly) is removed and reinstalled or replaced, the sliding roof ECU (sliding roof drive gear assembly) or roof sunshade ECU (sliding roof drive gear assembly) must be initialized.

    Click here

  • DTC B2345 is stored in the sliding roof ECU (sliding roof drive gear assembly) and roof sunshade ECU (sliding roof drive gear assembly).

PROCEDURE

1.

CHECK FOR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Sliding Roof > Clear DTCs Body Electrical > Sliding Sunshade > Clear DTCs

(b) Check for DTCs.

Click here

Body Electrical > Sliding Roof > Trouble Codes Body Electrical > Sliding Sunshade > Trouble Codes

OK:

DTC B2345 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

CHECK DTC OUTPUT

(a) Check the parts from which this DTC has been output.

Result

Proceed to

DTC output from sliding roof ECU (sliding roof drive gear assembly)

A

DTC output from roof sunshade ECU (sliding roof drive gear assembly)

B
A

REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY)

B

REPLACE ROOF SUNSHADE ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY)

    Position Initialization Incomplete (B2343)
    DESCRIPTION This DTC is stored when the sliding roof ECU (sliding roof drive gear assembly) or roof sunshade ECU (sliding roof drive gear assembly) has not been initialized. Sliding Roof DTC No. ...

    Remote Control System does not Operate
    DESCRIPTION The main body ECU (multiplex network body ECU) receives remote control signals from the driver door key cylinder or wireless transmitter. Then, the main body ECU (multiplex network body EC ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Rear No. 1 Seat Inner Belt Assembly(for 60/40 Split Seat Type Lh Side): Removal
    REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during rear No. 1 seat inner belt assembly removal/installation are shown below. Necessary Procedure After Part ...

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Transfer Assembly: Removal
    REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during transfer assembly removal/installation are shown below. Necessary Procedure After Parts Removed/Installe ...

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

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

    © 2026 Copyright www.lexusrx.net
    0.0116