Problem Symptoms Table

WARNING: This page is about a different car, the 2008 Lexus IS F. 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 problem symptoms. If multiple suspected areas are listed, 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 this system before inspecting the suspected areas below.

Fig 1: Identifying D/C CUT Fuse

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

PROBLEM SYMPTOMS CHART

Symptom	Suspected Area	See
Steering wheel cannot be unlocked (the engine cannot be started)	Initialization	INITIALIZATION
	Check for DTCs in the smart access system with push-button start	DIAGNOSTIC TROUBLE CODE CHART
	Check for DTCs in the engine immobilizer system	DIAGNOSTIC TROUBLE CODE CHART
	Check that the LCK/UNLOCK REC item in the Data List of the certification ECU displays YES within 10 seconds after starting the engine (I it displays NO, see "No steering unlock command" in this table)	DATA LIST / ACTIVE TEST
	Check the output from the IGE terminal of the steering lock ECU	STEERING LOCK MOTOR DRIVE POWER CIRCUIT
	Steering lock ECU power source circuit	POWER SOURCE CIRCUIT
	Replace the steering lock ECU	DISASSEMBLY
Steering wheel cannot be unlocked (no steering unlock command)	Check that the S CODE MACH item in the Data List of the certification ECU displays OK (If it displays NG, replace the ID code box)	DATA LIST / ACTIVE TEST
	Check that the L CODE MACH item in the Data List of the certification ECU displays OK (If it displays NG, replace the ID code box)	DATA LIST / ACTIVE TEST
	Replace the certification ECU	-
Steering wheel cannot be locked	Check for DTCs in the smart access system push-button start	DIAGNOSTIC TROUBLE CODE CHART
	Check for DTCs in the engine immobilizer system	DIAGNOSTIC TROUBLE CODE CHART
	With the engine switch off and the shift lever in P, open and close the driver door After that, check that the LCK/UNLOCK REC item in the Data List of the certification ECU displays YES within 10 seconds (If it displays NO, see "No steering lock command" in this table)	DATA LIST / ACTIVE TEST
	Check the output from the IGE terminal of the steering lock ECU	STEERING LOCK MOTOR DRIVE POWER CIRCUIT
	Steering lock ECU power source circuit	POWER SOURCE CIRCUIT
	Replace the certification ECU	-
Steering wheel cannot be locked (no steering lock command)	Courtesy light switch circuit	FRONT DOOR COURTESY SWITCH
	Check that the S CODE MACH item in the Data List of the certification ECU displays OK (If it displays NG, replace the ID code box)	DATA LIST / ACTIVE TEST
	Check that the L CODE MACH item in the Data List of the certification ECU displays OK (If it displays NG, replace the ID code box)	DATA LIST / ACTIVE TEST
	Replace the certification ECU	-

Push Button Start Function

PROBLEM SYMPTOMS CHART

Symptom	Suspected Area	See
Engine does not start	Initialization	INITIALIZATION
	Check for DTCs in the smart access system with push-button start	DIAGNOSTIC TROUBLE CODE CHART
	Check for DTCs in the engine immobilizer system	DIAGNOSTIC TROUBLE CODE CHART
	Check that the engine switch is turned on	-
	Check cranking operation (If cranking operation is possible, see "Engine dose not start due to the engine immobilizer" in this table)	-
	Check the SHIFT P SIG item in the Data List of the power source control ECU and confirm that the shift signal is normal	-
	Check whether the steering wheel is locked or unlocked (If it is locked, see "Steering wheel cannot be unlocked" in the steering lock function table)	-
	Check the output from the SLP1 terminal of the steering lock ECU	UNLOCK POSITION SENSOR SIGNAL CIRCUIT
	Check the output signal from the engine switch of the certification ECU (DTC B2275)	DTC B2275 STSW MONITOR MALFUNCTION
	Replace the power source control ECU	-
Engine does not start due to the engine immobilizer	Check that the L CODE MACH item in the Data List of the certification ECU displays OK (If it displays NG, replace the ID code box)	DATA LIST / ACTIVE TEST
	Check that the ENG START REQ item in the Data List of the certification ECU displays YES (If it displays NO, replace the certification ECU)	DATA LIST / ACTIVE TEST
	Check that the S CODE MACH item in the Data List of the certification ECU displays OK (If it displays NG, replace the ID code box)	DATA LIST / ACTIVE TEST
	Replace the ID code box	-