Certification ECU Communication Stop Mode [03/2023 - ]: Description

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2025 Lexus NX 350, 2025 Lexus NX 250, 2024 Lexus NX 350, 2024 Lexus NX 250, and 2023 Lexus NX 350. However, it is still accessible from the selected car via links, so may be relevant.

Detection Item	Symptom	Trouble Area
Certification ECU Communication Stop Mode	Communication stop for "Certification (Smart)" and/or "Power Management" is indicated on the "Communication Bus Check" screen of the GTS. Refer to DIAGNOSIS SYSTEM [03/2023 - 03/2024] , or refer to DIAGNOSIS SYSTEM [03/2024 - ]	Certification ECU (smart key ECU assembly) branch line or connector Power source circuit of certification ECU (smart key ECU assembly) Certification ECU (smart key ECU assembly) ground circuit Certification ECU (smart key ECU assembly)