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Home >> Lexus >> 2020 >> UX 200 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 (Smart Access System W/ Push-Button Start (Start Function) (Symptom Tests) (2 Of 2) (Hybrid)) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, HV Model) >> Power Source Mode does not Change to ON (READY) [07/2022 - ] >> Description

Power Source Mode does not Change to ON (READY) [07/2022 - ]: 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.

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

RELATED DATA LIST AND ACTIVE TEST ITEMS

Problem Symptom Data List and Active Test
Power source mode does not change to ON (READY) Power Source Control 
  • Stop Light Switch1
  • Shift P Signal
  • IG Relay Monitor (Inside)
  • IG Relay Monitor (Outside)
  • Latch Circuit
  • Starter Request Signal
  • Power Supply Condition

Smart Access 
  • Immobiliser
  • Engine Start Request
  • L Code Check
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