2003 LEXUS LS430 Factory Repair Manual

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Page 3209 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 35: No Communication In Immobilizer System, DTC B2798: Communication Malfunction No. 2 DTC - Wiring Diagram Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. INSPECTION PROCEDURE 1.READ DATA LIST

Page 3210 of 4500

LEXUS LS430 2003 Factory Repair Manual OK: Engine starts. NG: Go to step 3 OK: RE-REGISTER OR REPLACE KEY THAT CANNOT START ENGINE 3.CHECK WIRE HARNESS (STEERING LOCK ECU - TRANSPONDER KEY AMPLIFIER) a. Disconnect the S46 ECU connec

Page 3211 of 4500

LEXUS LS430 2003 Factory Repair Manual

Page 3212 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 36: Checking Wire Harness (Steering Lock ECU -Transponder Key Amplifier) Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step 4.REPLAC

Page 3213 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 38: Communication Malfunction No. 1 - Wiring Diagram Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. INSPECTION PROCEDURE 1.CHECK KEYS a. Check if the smart key being used is near other smart ke

Page 3214 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 39: Checking Keys Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. B: Go to step 3 A: Go to next step 2.CHECK FOR DTCS a. Separate the keys from each other. Or, remove the key ring. b. Delet

Page 3215 of 4500

LEXUS LS430 2003 Factory Repair Manual a. Using an oscilloscope or the hand-held tester check the waveform between the terminals of the T8 amplifier connector and S46 ECU connector. The waveform should be similar to the illustration on t

Page 3216 of 4500

LEXUS LS430 2003 Factory Repair Manual Standard: STEERING LOCK ECU - TRANSPONDER KEY AMPLIFIER - RESISTANCE TABLE Tester connectionSpecified condition S46-17 (CODE) - T8-4 (CODE)Below 1 ohms
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