How To Proceed With Troubleshooting

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 this procedure to troubleshoot the theft deterrent system.
* Use the Techstream

VEHICLE BROUGHT TO WORKSHOP
CUSTOMER PROBLEM ANALYSIS
1. Interview the customer to confirm the trouble (See HOW TO PROCEED WITH TROUBLESHOOTING )

INSPECT COMMUNICATION FUNCTION OF MULTIPLEX COMMUNICATION SYSTEM (BEAN)*

Use the Techstream to check for normal function of the multiplex communication system (See DIAGNOSTIC TROUBLE CODE CHART )

Result

RESULT REFERENCE

Result	Proceed to
DTC is not output	A
DTC is output	B

B: Go To MULTIPLEX COMMUNICATION ARTICLE (See DIAGNOSTIC TROUBLE CODE CHART )

A: Go to next Step

SYMPTOM SIMULATION

PROBLEM SYMPTOMS TABLE

Result

RESULT REFERENCE

Result	Proceed to
Fault is not listed in problem symptoms table	A
Fault is listed in problem symptoms table	B

B: Go to step 7

A: Go to next Step

PERFORM TROUBLESHOOTING ACCORDING TO MALFUNCTION SYMPTOM*
1. Terminals of ECU (See TERMINALS OF ECU ).
2. System Description (See SYSTEM DESCRIPTION )
3. Data List/Active Test (See DATA LIST / ACTIVE TEST ).
REPAIR OR REPLACE
CONFIRMATION TEST
NEXT: END