relay LEXUS LS430 2003 Factory Repair Manual

Theft warning ECU assy:
DATA LIST - THEFT WARNING ECU ASSY
2.ACTIVE TEST
HINT:
Performing the hand-held tester's ACTIVE TEST allows relay, VSV, actuator and other items to be
operated without removing any parts. Performing the ACTIVE TEST early in troubleshooting is one way
to save time. The DATA LIST can be displayed during the ACTIVE TEST.
a. Connect the hand-held tester (with CAN VIM) to the DLC3.
b. Turn the ignition switch ON.
c. Perform the ACTIVE TEST by following the directions on the tester screen.
Steering lock ECU:
ACTIVE TEST - STEERING LOCK ECU
DIAGNOSTIC TROUBLE CODE CHART
sub-key/min. 0, max. 15sub-key
REGIST MAS CODENumber of registered
master key/min. 0, max.
15Number of registered
master key-
REG CODE SPACEMemory space for key
codes registration/ NOT
FULL or FULLNOT FUL: Possible to
register more key codes
FULL: Cannot register
any more key codes-
Item
Measurement Item/
Display (Range)
Normal ConditionDiagnostic Note
ACC SWIgnition switch signal/ON
or OFFOFF: Ignition switch is
OFF ON: Ignition switch
is ACC-
IG SWIgnition switch signal/ON
or OFFOFF: Ignition switch is
OFF or ACC ON:
Ignition switch is ON-
ItemTester DetailsDiagnostic Note
SECURITY INDICTurn security indicator ON/OFF-
DTCDescription
DTC B2780PUSH SWITCH/KEY UNLOCK WARNING
SWITCH MALFUNCTION

Fig. 24: Theft Warning ECU Assy Data List
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2.ACTIVE TEST
HINT:
Performing the hand-held tester's ACTIVE TEST allows relay, VSV, actuator and other items to be
operated without removing any parts. Performing the ACTIVE TEST early in troubleshooting is one way
to save time. The DATA LIST can be displayed during the ACTIVE TEST.
a. Connect the hand-held tester (with CAN VIM) to the DLC3.
b. Turn the ignition switch ON.
c. Perform the ACTIVE TEST by following the directions on the tester screen.
Transponder key ECU assy:
TRANSPONDER KEY ECU ASSY - ACTIVE TEST
DIAGNOSTIC TROUBLE CODE CHART
1.TRANSPONDER KEY ECU DTC CHART
ItemTester Details
SECURITY INDICTurn security indicator ON/OFF
DTCDescription
DTC B2780PUSH SWITCH/KEY UNLOCK WARNING
SWITCH MALFUNCTION
DTC B2793TRANSPONDER CHIP MALFUNCTION
DTC B2794UNMATCHED ENCRYPTION CODE
DTC B2795UNMATCHED KEY CODE
DTC B2796, DTC B2798NO COMMUNICATION IN IMMOBILIZER
SYSTEM
DTC B2797COMMUNICATION MALFUNCTION NO.1
DTC B2799ENGINE IMMOBILIZER SYSTEM
MALFUNCTION

PROBLEM SYMPTOMS TABLE
Fig. 93: Problem Symptoms Table

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
The rear sunshade system is part of the large-scale multiplex communication system. This system features
shared communication wiring that reduces the wiring complexity of the communication lines. The first step in
any repair is to confirm the proper operation of the communication system. Proceed with troubleshooting after
the communication has been verified (see MULTIPLEX COMMUNICATION SYSTEM
).
INSPECTION
1.INSPECT RELAY (Marking: RR S/SHADE)
a. Remove the RR S/SHADE relay from the luggage room J/B.
b. Measure the resistance of the RR S/SHADE relay.

Fig. 94: Inspecting RR S/SHADE Relay
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Standard:
RR S/SHADE RELAY - RESISTANCE TABLE
If the result is not as specified, replace the relay.
2.INSPECT TRACTION CONTROL SWITCH
(REAR SUNSHADE SWITCH FOR FRONT SIDE)
a. Measure the resistance of the switch.
Standard:
Tester ConnectionSpecified Condition
3 - 510 kohms or higher
3 - 5Below 1 ohms (when battery voltage is applied to
terminals 1 and 2)

Fig. 96: Inspecting Rear Sunshade Switch
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
If the result is not as specified, replace the switch.
4.INSPECT LUGGAGE ROOM JUNCTION BLOCK ECU
a. Disconnect the relay connector.
b. Measure the voltage of each terminal of the wire harness side connector.
Standard:
LUGGAGE ROOM JUNCTION BLOCK ECU - VOLTAGE TABLE
Tester ConnectionConditionSpecified Condition
1 (IG) - Body groundIgnition switch ON10 to 14 V
1 (IG) - Body groundIgnition switch OFF or ACCBelow 1 V
2 (REV) - Body groundIgnition switch ON, Shift position
R10 to 14 V
2 (REV) - Body groundIgnition switch ON, Shift position Below 1 V

Fig. 99: Connecting Battery Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Reverse the polarity and check that the rear sunshade moves down.
If all the check results are as specified above and normal wire harness is confirmed, replace the rear
sunshade control relay (see REPLACEMENT
).
REPLACEMENT
HINT:
The installation procedures are the removal procedures in reverse order. However, only installation
procedures requiring additional information are included.
A bolt without a torque specification is shown in the standard bolt chart (see SPECIFIED TORQUE
FOR STANDARD BOLTS ).

Fig. 14: Driver Seat ECU - Data List Chart (3 Of 3)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2.ACTIVE TEST
HINT:
Using the hand-held tester's ACTIVE TEST allows relay, VSV, actuator, and other items to be operated
without removing any parts. Reading the ACTIVE TEST early in troubleshooting is one way to save

INSPECTION PROCEDURE
1.INSPECT FUSE (D/C CUT, D P/SEAT, MPX-IG, AM1, MPX-B1)
a. Remove the D/C CUT fuse from the FL block.
b. Remove the D P/SEAT, MPX-IG and AM1 fuses from the driver side J/B.
c. Remove the MPX-B1 fuse from the passenger side J/B.
d. Measure the resistance of the fuse.
Standard: Below 1 ohms
NG: REPLACE FUSE
OK: GO TO NEXT STEP
2.INSPECT RELAY (Marking: D-IG1)
a. Remove the D-IG1 relay from the driver side J/B.
b. Measure the resistance of the relay.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Tester connectionSpecified condition
3 - 510 kohms or higher
3 - 5Below 1 ohms (when battery voltage is applied to terminals 1 and 2)

Fig. 16: Identifying D-IG1 Relay Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE RELAY
OK: GO TO NEXT STEP
3.CHECK WIRE HARNESS (DRIVER SEAT ECU - BATTERY AND BODY GROUND)
a. Disconnect the D27 and D28 ECU connectors.
b. Measure the voltage and resistance of the wire harness side connectors.
Fig. 17: Identifying D27 And D28 Driver Seat ECU Connectors Terminals

NG: REPLACE FUSE
OK: GO TO NEXT STEP
2.INSPECT RELAY (D-IG1)
a. Remove the D-IG1 relay from the driver side J/B.
b. Measure the resistance of the relay.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Fig. 19: Identifying D
-IG1 Relay Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE RELAY
OK: GO TO NEXT STEP
3.CHECK WIRE HARNESS (DRIVER DOOR ECU - BATTERY AND BODY GROUND)
Tester connectionSpecified condition
3 - 510 kohms or higher
3 - 5Below 1 ohms (when battery voltage is applied to terminals 1 and 2)