Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Position Initialization Incomplete (B2343)

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual / Vehicle Exterior / Sliding Roof / Convertible / Panoramic Moon Roof System / 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.

Detection Item

DTC Detection Condition

Trouble Area

B2343

Position Initialization Incomplete

Sliding roof ECU (sliding roof drive gear assembly) has not been initialized.

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B2343

Position Initialization Incomplete

Roof sunshade ECU (sliding roof drive gear assembly) has not been initialized.

Roof sunshade ECU (Sliding roof drive gear assembly)

WIRING DIAGRAM

Refer to DTC B2341.

Click here

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

  • The panoramic moon roof system uses the LIN communication system. First, confirm that there are no malfunctions in the LIN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

  • DTC B2343 is stored in the sliding roof ECU (sliding roof drive gear assembly) and roof sunshade ECU (sliding roof drive gear assembly).

HINT:

If DTC B2342 and B2343 are output simultaneously, perform troubleshooting for DTC B2342 first.

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 B2343 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
B

GO TO STEP 6

A

3.

INITIALIZE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY)

(a) Check that the sliding roof ECU (sliding roof drive gear assembly) can be initialized.

Click here

OK:

Sliding roof ECU (sliding roof drive gear assembly) can be initialized.

NG

REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY)

OK

4.

CHECK SLIDING ROOF OPERATION

(a) Check the sliding roof auto operation function.

Click here

OK:

Auto operation function operates normally.

NG

REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY)

OK

5.

CHECK DTC OUTPUT

(a) Clear the DTCs.

Click here

Body Electrical > Sliding Roof > Clear DTCs

(b) Check for DTCs.

Body Electrical > Sliding Roof > Trouble Codes

OK:

DTC B2343 is not output.

OK

END (MALFUNCTION DUE TO INITIALIZATION FAILURE)
NG

REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY)

6.

INITIALIZE ROOF SUNSHADE ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY)

(a) Check that the roof sunshade ECU (sliding roof drive gear assembly) can be initialized.

Click here

OK:

Roof sunshade ECU (sliding roof drive gear assembly) can be initialized.

NG

REPLACE ROOF SUNSHADE ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY)

OK

7.

CHECK ROOF SUNSHADE OPERATION

(a) Check the roof sunshade auto operation function.

Click here

OK:

Auto operation function operates normally.

NG

REPLACE ROOF SUNSHADE ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY)

OK

8.

CHECK DTC OUTPUT

(a) Clear the DTCs.

Click here

Body Electrical > Sliding Sunshade > Clear DTCs

(b) Check for DTCs.

Body Electrical > Sliding Sunshade > Trouble Codes

OK:

DTC B2343 is not output.

OK

END (MALFUNCTION DUE TO INITIALIZATION FAILURE)
NG

REPLACE ROOF SUNSHADE ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY)

    Switch Failure (B2342)
    DESCRIPTION This DTC is stored when the sliding roof ECU (sliding roof drive gear assembly) or roof sunshade ECU (sliding roof drive gear assembly) detects that the map light assembly is stuck for 30 ...

    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 N ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Automatic Transaxle System: Registration
    REGISTRATION CAUTION / NOTICE / HINT NOTICE: When the automatic transaxle is replaced, the transaxle compensation code must be registered to the ECM (proceed to Procedure 1). After the automatic transaxle is installed, the Quick Response (QR) code label will be positioned where the code cannot be ...

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Electrical Key Oscillator (for Outside Luggage Compartment): Components
    COMPONENTS ILLUSTRATION *A w/o Rear No. 2 Seat *B w/ Rear No. 2 Seat *1 ELECTRICAL KEY ANTENNA *2 REAR BUMPER ENERGY ABSORBER ...

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

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

    © 2026 Copyright www.lexusrx.net
    0.0115