Check Bus 4 Line for Short to GND [10/2018 - 08/2021]: Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus UX 250h, 2023 Lexus UX 250h, 2022 Lexus UX 250h, 2021 Lexus UX 250h, and 2020 Lexus UX 250h. However, it is still accessible from the selected car via links, so may be relevant.

There may be a short circuit between one of the CAN bus lines and GND when there is no resistance between terminal 22 (CA2H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 7 (CA2L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.

Symptom	Trouble Area
No resistance exists between terminal 22 (CA2H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 7 (CA2L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.	Short to GND in CAN main bus line Short to GND in CAN branch line ECM Hybrid vehicle control ECU Central gateway ECU (network gateway ECU) Brake booster with master cylinder assembly Airbag ECU assembly Steering sensor Power steering ECU with motor assembly Brake actuator assembly Tire pressure ECU and receiver Occupant Detection ECU No. 4 CAN junction connector No. 7 CAN junction connector

Symptom

Trouble Area

No resistance exists between terminal 22 (CA2H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 7 (CA2L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.

Short to GND in CAN main bus line
Short to GND in CAN branch line
ECM
Hybrid vehicle control ECU
Central gateway ECU (network gateway ECU)
Brake booster with master cylinder assembly
Airbag ECU assembly
Steering sensor
Power steering ECU with motor assembly
Brake actuator assembly
Tire pressure ECU and receiver
Occupant Detection ECU
No. 4 CAN junction connector
No. 7 CAN junction connector