DTC B2312: Power Window Switch Malfunction [06/2018 - ]: Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

The power window regulator motor assemblies are operated by the multiplex network master switch assembly, power window regulator switch assembly or rear power window regulator switch assemblies. The power window regulator motor assemblies have motor, regulator and ECU functions.

This DTC is stored when the ECU built into a power window regulator motor assembly and multiplex network master switch assembly determine that the multiplex network master switch assembly, power window regulator switch assembly or rear power window regulator switch assembly is stuck.

MASTER SWITCH

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2312	Power Window Switch Malfunction	Multiplex network master switch assembly stuck Multiplex network master switch assembly held in same position for more than 20 seconds Multiplex network master switch assembly operated for 20 seconds or more	Multiplex network master switch assembly

D-DOOR MOTOR

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2312	Power Window Switch Malfunction	Multiplex network master switch assembly stuck Multiplex network master switch assembly held in same position for more than 20 seconds	Multiplex network master switch assembly Power window regulator motor assembly (for driver door) Wire harness or connector

P-DOOR MOTOR

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2312	Power Window Switch Malfunction	Power window regulator switch assembly stuck Power window regulator switch assembly held in same position for more than 20 seconds	Power window regulator switch assembly Power window regulator motor assembly (for front passenger door) Wire harness or connector

RL-DOOR MOTOR

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2312	Power Window Switch Malfunction	Rear power window regulator switch assembly (for LH door) stuck Rear power window regulator switch assembly (for LH door) held in same position for more than 20 seconds	Rear power window regulator switch assembly (for LH door) Power window regulator motor assembly (for rear LH door) Wire harness or connector

RR-DOOR MOTOR

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2312	Power Window Switch Malfunction	Rear power window regulator switch assembly (for RH door) stuck Rear power window regulator switch assembly (for RH door) held in same position for more than 20 seconds	Rear power window regulator switch assembly (for RH door) Power window regulator motor assembly (for rear RH door) Wire harness or connector