LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2012 >> IS 350C >> Repair and Diagnosis >> Electrical >> Starter >> Smart Access System With Push-Button Start (For Start Function) (Diagnostic Codes & Symptom Tests) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) >> DTC B2272: Ignition 1 Monitor Malfunction >> Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC B2272: Ignition 1 Monitor Malfunction: Description

This DTC is stored when there is a problem in the IG1 output circuit, which is from the inside of the power source control ECU to the RH-IG or LH-IG relay.

HINT: 

When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC No. DTC Detection Condition Trouble Area
B2272 IG1 relay actuation circuit inside power source control ECU or other related circuit is malfunctioning
  • Main body ECU RH (cowl side junction block RH)
  • Main body ECU LH (cowl side junction block LH)
  • Power source control ECU
  • Wire harness or connector
scientia non olet · About LEMON Manuals