Problem Symptoms Table

WARNING: This page is about a different car, the 2007 Lexus GS 350. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Use the table below to help determine the case 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

PROBLEM SYMPTOMS CHART

Symptom	Suspected Area	See
Power Source Mode does not Change	1.B2271	DTC B2271 IGNITION HOLD MONITOR MALFUNCTION
	2. B2272	DTC B2272 IGNITION 1 MONITOR MALFUNCTION
	3. B2273	DTC B2273 IGNITION 2 MONITOR MALFUNCTION
	4. B2274	DTC B2274 ACC MONITOR MALFUNCTION
	5. B2278	DTC B2278 ENGINE SWITCH CIRCUIT MALFUNCTION
	6. Engine Switch Indicator Circuit	ENGINE SWITCH INDICATOR CIRCUIT
	7. Room Oscillator does not Recognize Key	ROOM OSCILLATOR DOES NOT RECOGNIZE KEY
	8. Engine Switch	REMOVAL
	9. Immobiliser code ECU	-
	10. Key	DOOR CONTROL TRANSMITTER
	11. Power Source Control ECU	-
	12. Wire Harness	POWER SOURCE MODE DOES NOT CHANGE
Engine does not Start	1. DTC for Push-button Start Function	DIAGNOSTIC TROUBLE CODE CHART
	2. Power Source Mode does not Change	POWER SOURCE MODE DOES NOT CHANGE
	3. Engine Immobiliser System	HOW TO PROCEED WITH TROUBLESHOOTING
	4. Steering Lock System	HOW TO PROCEED WITH TROUBLESHOOTING
	5. SFI System	HOW TO PROCEED WITH TROUBLESHOOTING
	6. Engine Switch	REMOVAL
	7. Power Source Control ECU	-
	8. Wire Harness	ENGINE DOES NOT START