Problem Symptoms Table

WARNING: This page is about a different car, the 2009 Lexus GS 450h. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to the system before inspecting the suspected areas below.

PUSH-BUTTON START

Symptom	Suspected area	See
Power Source Mode does not Change	1. B2271	Refer to DTC B2271: Ignition Hold Monitor Malfunction
	2. B2272	Refer to DTC B2272: Ignition 1 Monitor Malfunction
	3. B2273	Refer to DTC B2273: Ignition 2 Monitor Malfunction
	4. B2274	Refer to DTC B2274: ACC Monitor Malfunction
	5. B2278	Refer to DTC B2278: Power Switch Circuit Malfunction
	6. Power Switch Indicator Circuit	Refer to Power Switch Indicator Circuit
	7. Room Oscillator does not Recognize Key	Refer to Room Oscillator does not Recognize Key
	8. Power Switch	Refer to INSPECTION
	9. ID Code Box	-
	10. Key	-
	11. Certification ECU	-
	12. Power Source Control ECU	-
	13. Wire Harness	Refer to Power Source Mode does not Change
Power Source Mode does not Change to ON (READY)	1. DTC for Smart Access System with Push-button Start	Refer to DIAGNOSTIC TROUBLE CODE CHART
	2. Power Source Mode does not Change	Refer to Power Source Mode does not Change
	3. Engine Immobiliser System	Refer to HOW TO PROCEED WITH TROUBLESHOOTING
	4. Electric Steering Lock	Refer to HOW TO PROCEED WITH TROUBLESHOOTING
	5. Hybrid Control System	Refer to HOW TO PROCEED WITH TROUBLESHOOTING
	6. SFI System	Refer to HOW TO PROCEED WITH TROUBLESHOOTING
	7. Power Switch	Refer to INSPECTION
	8. Power Source Control ECU	-
	9. Wire Harness	Refer to Power Source Mode does not Change to ON (READY)