Using Lexus Hand-held Tester
WARNING: This page is about a different car, the 2002 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
Install Lexus hand-held tester to DLC1 or DLC3. DLC1 is located in engine compartment on right fender apron. See Figure. DLC3 is located under left side of instrument panel. Read DTC by following prompts on tester. See tester operator's manual for instructions.