2003 LEXUS LS430 Factory Repair Manual

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Page 3225 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 1: Identifying Component Locations
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Page 3226 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 2: Identifying Engine Immobilizer System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.ENGINE IMMOBILIZER SYSTEM DESCRIPTION
The engine immobilizer system is designed to prevent the v

Page 3227 of 4500

LEXUS LS430 2003 Factory Repair Manual receives the faint electric wave. Upon receiving the faint electric wave, the transponder chip outputs a key
ID code signal. The transponder key coil receives this signal, the transponder key amplifi

receives the faint electric wave. Upon receiving the faint electric wave, the transponder chip outputs a key
ID code signal. The transponder key coil receives this signal, the transponder key amplifier amplifies it,
and then the signal is transmitted to the ECU.
The ECU matches the key's ID code with the vehicle's ID code, which was previously registered in the
ECU, and then communicates the results to the ECM using SFI communication.
After the identification results show that the key's ID code matches the vehicle's ID code and the ECU has
confirmed their match: 1) the immobilizer system does not immobilize the engine and the engine starting
controls (fuel injection control and ignition control) enter standby mode; and 2) the ECU transmits a
security indicator signal that communicates "indicator off" to the theft warning ECU (theft deterrent
ECU). Then, the theft warning ECU turns off the security indicator lamp.
HINT:
<00380056004800030057004b004c00560003005300550052004600480047005800550048000300570052000300570055005200580045004f00480056004b00520052005700030057004b0048000300480051004a004c005100480003004c00500050005200
45004c004f004c005d0048005500030056005c005600570048[m. The hand-held tester should be used in steps
4, 5 and 7.
1.VEHICLE BROUGHT TO WORKSHOP
2.CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK (See CUSTOMER
PROBLEM ANALYSIS CHECK )
3.CRANK ENGINE FOR MORE THAN 10 SECONDS
4.CHECK FOR DTCS
a. Check for DTCs and note any codes that are output.
b. Delete the DTC.
c. Recheck for DTCs. Based on the DTC output in (a), try to force output of the same SFI system
DTC or engine immobilizer system DTC by simulating the operation indicated by the DTC.
1. If the DTC does not reoccur, proceed to A.
2. If the SFI system DTC reoccurs, proceed to B.
3. If the engine immobilizer system DTC reoccurs, proceed to C.
B: Go to SFI SYSTEM (See DIAGNOSTIC TROUBLE CODE CHART
)
C: Go to step 8
A: Go to next step
5.READ DATA LIST USING HAND-HELD TESTER
a. Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN
VIM). Then connect the CAN VIM to the DLC3.
b. Turn the ignition switch ON and push the hand-held tester main switch ON.
c. Read the DATA LIST.

Page 3228 of 4500

LEXUS LS430 2003 Factory Repair Manual Transponder key ECU assy:
Fig. 3: Transponder Key ECU Assy Data List

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: "ON" (Key is in ignition key cylinder) appears on the screen.
NG: S

Page 3229 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 4: Identifying Customer Problem Analysis Check
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
The key has 2 codes: the key code (immobilizer code) and wireless code. All of these code type

Page 3230 of 4500

LEXUS LS430 2003 Factory Repair Manual a. When adding master keys and sub-keys (additional registration).
1. Register the key code (immobilizer code) in the transponder key ECU.
CODE REGISTRATION TABLE (ADDITIONAL REGISTRATION)
b. When

Page 3231 of 4500

LEXUS LS430 2003 Factory Repair Manual registered in the transponder key ECU.
New transponder key ECUs are automatically set to automatic key code registration mode.
Automatic Key Code Registration (New Registration):
Fig. 5: Automati

Page 3232 of 4500

LEXUS LS430 2003 Factory Repair Manual When the immobilizer system is operating normally and the key is pulled out, the security
indicator blinks continuously.
If the key code registration has failed in automatic key code registration m

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