2003 LEXUS LS430 key

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Page 3265 of 4500

LEXUS LS430 2003  Factory Repair Manual a. Check if the engine starts with the vehicle's other keys.  
OK: Engine starts.  
NG: Go to step 3  
OK: RE-REGISTER OR REPLACE KEY THAT CANNOT START ENGINE  
3.CHECK WIRE HARNESS (TRANSPONDER K

Page 3267 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 36: Identifying T9 ECU And T8 Amplifier Connector Terminals 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
Standard:  
TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER - RESISTANCE TABLE 
NG: REPA

Page 3268 of 4500

LEXUS LS430 2003  Factory Repair Manual Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM 
Fig. 38: DTC B2797 
- Wiring Diagram 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
INSPECTION PROCEDURE 
1.CHECK KEYS 
a. Check if the ign

Page 3269 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 39: Checking Keys 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
Result:  
CHECKING KEY RESULT TABLE 
B: Go to step 3  
A: Go to next step  
ResultProceed to
Key is near other keys and/or key rin

Page 3270 of 4500

LEXUS LS430 2003  Factory Repair 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 th

Page 3271 of 4500

LEXUS LS430 2003  Factory Repair Manual NG: FIND CAUSE OF NOISE AND REMOVE IT  
OK: Go to next step  
4.CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSY - TRANSPONDER KEY 
AMPLIFIER) 
a. Disconnect the T9 ECU connector.  
b. Disconnect the T8 a

Page 3273 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 41: Identifying T9 And T8 Amplifier Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
Standard:  
TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER - RESISTANCE TABLE 
NG: REPAIR OR

Page 3274 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 43: DTC B2799 - Wiring Diagram 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
INSPECTION PROCEDURE 
1.CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSY - ECM) 
a. Disconnect the T9 ECU connector.  
b.