How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

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

VEHICLE BROUGHT TO WORKSHOP
INSPECT BATTERY VOLTAGE
Standard voltage: 11 to 14 V

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

CHECK DIAGNOSTIC TROUBLE CODE*

Check for DTCs and note any codes that are output.
Delete the DTC.

Recheck for DTCs. Try to prompt the DTC by simulating the original activity that the DTC suggests.

Result

RESULT CHART

Result	Proceed to
DTC does not reoccur	A
DTC reoccurs	B

B: Go to step 4

A: Go to next step.

OVERALL ANALYSIS AND TROUBLESHOOTING
1. See TERMINALS OF ECU
ADJUST, REPAIR OR REPLACE
CONFIRMATION TEST
NEXT: END