Engine does not Start [10/2022 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

When the electrical key transmitter sub-assembly is in the cabin and the engine switch is pressed, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode. Additionally, when the shift position is in P and the brake pedal is depressed, the engine can be started by pressing the engine switch.

RELATED DATA LIST AND ACTIVE TEST ITEMS

Problem Symptom	Data List and Active Test
Engine does not start	Power Source Control Stop Light Switch Shift P Signal Condition (Line) Neutral SW/ Clutch SW Starter Relay Driving Request (Starting Control) Starter Relay Power Supply Condition Smart Access Immobilizer Start Request L Code Check S Code Check

Problem Symptom

Data List and Active Test

Engine does not start

Power Source Control

Stop Light Switch
Shift P Signal Condition (Line)
Neutral SW/ Clutch SW
Starter Relay Driving Request (Starting Control)
Starter Relay
Power Supply Condition

Smart Access

Immobilizer
Start Request
L Code Check
S Code Check