keys LEXUS LS430 2003 Factory Owner's Manual

2.CHECK FOR DTCS
a. Separate the keys from each other. Or, remove the key ring.
b. Delete the DTC (see DTC CHECK/CLEAR
).
c. Insert a key into the ignition cylinder. Remove it. Repeat for all the other keys.
d. Check that no code is output.
NG: Go to step 3
OK: END
3.CHECK TRANSPONDER KEY ECU ASSY
a. Using an oscilloscope or the hand-held tester, check the waveform between the terminals of the T8
amplifier connector and T9 ECU connector. The waveform should be similar to the illustration .
OK: No noise present (see illustration ).
Fig. 40: Identifying Waveform

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WAVEFORM REFERENCE TABLE
TOOL SETTING REFERENCE TABLE
Tester connectionSpecified condition
T9-10 (CODE) - T8-4 (CODE)No noise is present