How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2006 Lexus IS 350 and 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Use these procedures to troubleshoot the lighting system.
*: Use the intelligent tester.

VEHICLE BROUGHT TO WORKSHOP
CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK
INSPECT BATTERY VOLTAGE
Standard:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding.

INSPECT MULTIPLEX COMMUNICATION SYSTEM (BEAN)*

Use the intelligent tester to check if the Multiplex Communication System (MPX) is functioning normally.

Result

RESULT REFERENCE

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

B : Go to step 8

A: Go To Next Step

CHECK FOR DTC*

Result

RESULT REFERENCE

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

B : Go to step 8

A: Go To Next Step

PROBLEM SYMPTOMS TABLE

Result

RESULT REFERENCE

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

B : Go to step 8

A: Go To Next Step

OVERALL ANALYSIS AND TROUBLESHOOTING*
1. Data List / Active Test (See DATA LIST / ACTIVE TEST )
2. Terminals of ECU (See TERMINALS OF ECU )
3. Inspection
ADJUST, REPAIR OR REPLACE
CONFIRMATION TEST
END