2003 LEXUS LS430 ignition

Fig. 59: Identifying Seat Climate Control Blower Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: Go to next step
3.CHECK WIRE HARNESS (CLIMATE CONTROL BLOWER (CLIMATE CONTROL ECU) -
BODY GROUND)
a. Disconnect the C21 blower connector.
b. Measure the resistance of the wire harness side connector.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
C21-7 (IG) - Body groundIgnition switch ON10 to 14 V

Fig. 61: Identifying PJ Passenger Side J/B Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: Go to step 5
OK: REPAIR OR REPLACE HARNESS AND CONNECTOR (PASSENGER SIDE J/B -
CLIMATE CONTROL BLOWER (CLIMATE CONTROL ECU))
5.CHECK WIRE HARNESS (PASSENGER SIDE J/B - BODY GROUND
a. Disconnect the PA and PE J/B connectors.
b. Measure the voltage of the wire harness side connectors.
Tester ConnectionConditionSpecified Condition
PJ-9 - Body groundIgnition switch ON10 to 14 V

Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Tester ConnectionConditionSpecified Condition
PA-1 - Body groundAlways10 to 14 V
PE-6 - Body groundIgnition switch ON10 to 14 V

1.INSPECT FUSE (RR S/HTR)
a. Remove the RR S/HTR fuse from the luggage room J/B.
b. Measure the resistance of the relay.
Standard: Below 1 ohms
NG: REPLACE FUSE
OK: Go to next step
2.CHECK WIRE HARNESS (SEAT CLIMATE CONTROL BLOWER (CLIMATE CONTROL
ECU) - BATTERY)
a. Disconnect the C27 or C29 blower connector.
b. Measure the voltage of the wire harness side connector.
Standard:
Rear LH
TESTER CONNECTION AND SPECIFIED CONDITION
Rear RH
TESTER CONNECTION AND SPECIFIED CONDITION - REAR RH
Tester ConnectionConditionSpecified Condition
C27-10 (IG) - Body groundIgnition switch ON10 to 14 V
Tester ConnectionConditionSpecified Condition
C29-10 (IG) - Body groundIgnition switch ON10 to 14 V

5.CHECK WIRE HARNESS (LUGGAGE ROOM J/B ASSY - BODY GROUND)
a. Disconnect the LC J/B connector.
b. Measure the voltage of the J/B connector.
Standard:
Rear LH
TESTER CONNECTION AND SPECIFIED CONDITION - REAR RH
Rear RH
TESTER CONNECTION AND SPECIFIED CONDITION - REAR RH
Tester ConnectionConditionSpecified Condition
LC-3 - Body groundIgnition switch ON10 to 14 V
Tester ConnectionConditionSpecified Condition
LC-4 - Body groundIgnition switch ON10 to 14 V

TESTER CONNECTION AND SPECIFIED CONDITION
Fig. 72: Identifying L
-IG1 Relay Terminals And Circuit
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE RELAY
OK: Go to next step
9.CHECK WIRE HARNESS (LUGGAGE ROOM J/B ECU - BATTERY AND BODY GROUND)
a. Disconnect the L14 J/B ECU connector.
b. Measure the voltage of the wire harness side connector.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Tester ConnectionSpecified Condition
3 - 510 kohms or higher
3 - 5Below 1ohms (when battery voltage is applied to terminal 1 and 2)
Tester ConnectionConditionSpecified Condition
L14-8 (IG (O)) - Body groundIgnition switch OFF10 to 14 V
L14-14 (P-GND) - Body groundAlwaysBelow 1ohms

REMOVAL AND INSTALLATION OF BATTERY TERMINAL
a. Before performing electronic work, disconnect the battery negative (-) terminal cable in order to prevent
it from shorting and burning out.
b. When disconnecting and reconnecting the battery cable, turn the ignition switch and lighting switch off
and loosen the terminal nut completely. Perform operations without twisting or prying on the terminal.
c. When the battery terminal cable is removed, the memories of the clock, radio, DTCs, etc. are erased. So
before removing it, check and make a note of them.
INITIALIZE SYSTEM REFERENCE
System NameSee Procedure
Front Power Seat Control SystemINITIALIZATION

INSPECTION ).
b. Computer area
The items from "Range Over ***/Range Approx ***" to "BLANK" can be changed with the
DISP1 (switch) of the steering pad switch.
c. Graphic area
Open Door Display:
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51005600110003[
HINT:
If the warning item other than the door warning is detected at the same time, the master warning
comes on/blinks in accordance to direction from the displayed item in the warning area.
Park Sonar Display:
See HOW TO PROCEED WITH TROUBLESHOOTING for details on the park sonar display.
The display blinks when the clearance is the closest.
Others:
The items "COMPASS", "OUTSIDE TEMPERATURE" and "BLANK" can be changed with the
DISP2 (switch) of the steering pad switch.
While +B is connected, the mode that was on when the ignition switch was turned off the last time
is displayed.
When the display is changed from radar cruise, it is displayed for only 6 seconds and then returns
to the radar cruise display.
While the radar cruise is on, "RADAR CRUISE READY" is displayed in the warning area if the
park sonar and door open displays are in the graphic area.
Radar Cruise Display:
See HOW TO PROCEED WITH TROUBLESHOOTING for details on the radar cruise
display.
The radar cruise set display is interrupted for only 6 seconds while the park sonar and/or open door
(displays) are on.
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4800030047004c0056005700440051004600480003005a004c[th other vehicles is getting to be too
close. This warning has priority over all.
1.VEHICLE BROUGHT TO WORKSHOP
2.(SEE CUSTOMER PROBLEM ANALYSIS CHECK
)
3.PROBLEM SYMPTOM CONFIRMATION (SEE PROBLEM SYMPTOMS TABLE
)
4.CHECK MULTIPLEX COMMUNICATION SYSTEM (SEE HOW TO PROCEED WITH
TROUBLESHOOTING )
a. Check for DTC outputs