2003 LEXUS LS430 reset

Body groundBody groundOFFto 5.5 V
RESET (C12-8) -
Body groundY-G - Body
groundTRIP RESET signal
Ignition switch ON, TRIP
RESET switch ON -->
OFFBelow 1 V --> 4.5
to 5.5 V
BELT (C12-9) -
Body groundL - Body
groundSeat belt condition
signal (Passenger side)P-BELT indicator light ON
--> OFFBelow 1 V --> 10
to 14 V
S E (C12-10) -
Body groundW - Body
groundGround (Switch)AlwaysBelow 1 ohms
ES (C12-11) -
Body groundW-B - Body
groundGroundAlwaysBelow 1 ohms
+B (C12-12) -
Body groundL-Y - Body
groundBatteryAlways10 to 14 V
+B (C12-13) -
Body groundR - Body
groundBatteryAlways10 to 14 V
TURN L(C12-14)
- Body groundG-B - Body
groundTurn signal L
Ignition switch ON, turn
signal LH indicator OFF --
> ONBelow 1 V --> 10
to 14 V
TURN R (C12-15)
- Body groundL-B (SB) -
Body groundTurn signal R
Ignition switch ON, turn
signal RH indicator OFF --
> ONBelow 1 V --> 10
to 14 V
ILL- (C12-16) -
Body groundW-L - Body
groundIllumination signalIgnition switch ONPulse generation
H (C12-17) - Body
groundP - Body
groundTurn signal L
Ignition switch ON,
HEIGHT HI indicator ON
--> OFFBelow 1 V --> 10
to 14 V
SI (C12-18) -
Body groundW-G - Body
groundSpeed signal (Input)Ignition switch ON and
turn the wheel slowlyPulse generation
(See waveform 2)
+S (C12-19) -
Body groundV-W - Body
groundSpeed signal (Output)Ignition switch ON and
turn the wheel slowlyPulse generation
E2 (C12-22) -
Body groundW-B - Body
groundGroundAlwaysBelow 1 ohms

Fig. 79: Identifying M4 And C12 Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
WIRING DIAGRAM
Fig. 80: ODO/TRIP Switch Wiring Diagram

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.READ VALUE OF HAND-HELD TESTER
a. Operate the hand-held tester according to the steps on the display and select the "DATA LIST".
METER:
DATA LIST REFERENCE
ItemMeasurement Item/ Range (Display)Normal ConditionDiagnostic Note
ODO/TRIP SWODO/TRIP switch is ON / OFFON: Switch is pushed
OFF: Switch is released-
TRIP RESET SWTRIP RESET switch is ON / OFFON: Switch is pushed
OFF: Switch is released-

OK:
Switch condition (ON/OFF) can be switched by actual operation.
NG: Go to step 2
OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
2.INSPECT TRIP SWITCH
a. Disconnect the trip switch connector.
b. Measure the resistance according to the value (s) in the table below.
Standard
TRIP SWITCH CONNECTOR RESISTANCE SPECIFICATIONS
NG: REPLACE TRIP SWITCH
Terminal NoConditionSpecified condition
T10-1 - T10-2ODO/TRIP switch OFF --> ON10 kohms or higher --> Below 1 ohms
T10-3 - T10-2RESET switch OFF --> ON10 kohms or higher --> Below 1 ohms

Standard:
Float down (switch on): Below 1 ohms
f. Pour the fluid back in the reservoir tank.
9.INSPECT WASHER LEVEL WARNING SWITCH
a. Disconnect the connector from the washer level warning switch.
b. Turn the ignition switch to the ON position.
c. Ground the terminal of the wire harness side connector, then check the washer level warning light.
OK:
Washer level warning light comes on.
10.MAINTENANCE LIQUID RESETTING PROCEDURE
a. Check that the display for ODO/TRIP shows no value (BLANK).
b. Turn the ignition switch off.
c. Pressing the reset switch, turn the ignition switch to the ON (keep pressing at least for 5 seconds).
d. The reset procedure is completed.
HINT:
During reset procedure:
"Mileage Reset" is displayed and the master warning light comes on with a buzzer sound.
Completion of reset procedure:
"Mileage Reset" and the master warning light go off.
If the ignition switch is turned off during reset procedure, reset mode is canceled.
If the reset switch is turned off during the reset procedure, reset mode is canceled and the display
shows the condition prior to the reset procedure.
If "Maint Reqd Soon" is displayed, it goes off 15 seconds after turning the ignition switch to the
ON position.

SYSTEM NAME AND PAGE REFERENCE
1.Pay attention to the following points when inspecting the cruise control system.
a. Push the cruise control main switch ON-OFF button off when not using the cruise control.
b. Be careful of vehicle speed increase when driving downhill with the cruise control on.
c. RESUME/ACCEL operation, after canceling the cruise control, works as RESUME, and works as
ACCEL while the cruise control system is in operation.
d. Push the cruise control main switch ON-OFF button off and reset the cruise control if the CRUISE
main indicator light blinks while the cruise control system is in operation. When the cruise control
cannot be set by this procedure or cancelled immediately after setting, there may be a malfunction
in the system.
e. Do not use the cruise control system where the road conditions are as follows:
Heavy traffic
Steep downhill
Sharp turns
Icy or snowy roads
Slippery roads
System NameSee Procedure
Front Power Seat Control SystemINITIALIZATION

release it. Check that vehicle speed decreases by approximately 1.6 km/h (1.0 mph) (Tap-
down function).
Fig. 7: Checking COAST Function

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
d. Inspect the CANCEL function.
1. Push the ON-OFF button on.
2. Drive at the required speed (40 km/h (25 mph) or higher).
3. Push the cruise control main switch to SET/COAST.
4. When doing one of the following, check that the cruise control system is cancelled and that
the normal driving mode is reset.
Depressing the brake pedal
Moving the shift lever to any position except D (6th, 5th, and 4th gears)
Pushing the ON-OFF button off
Pulling the cruise control main switch to CANCEL

Fig. 8: Checking CANCEL Function
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
e. Inspect the RES (RESUME) function.
1. Push the ON-OFF button on.
2. Drive at the required speed (40 km/h (25 mph) or higher).
3. Push the cruise control main switch to SET/COAST.
4. When doing one of the following, check that the cruise control system is cancelled and that the
normal driving mode is reset.
Depressing the brake pedal
Moving the shift lever to any position except D (6th, 5th, and 4th gears)
Pulling the cruise control main switch to CANCEL
5. After pushing the cruise control main switch to RES/ ACC at a driving speed of more than 40 km/h
(25 mph), check that the vehicle restores the speed prior to the cancellation.

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
If the value does not change to 0°, it is possible that the sensor is aiming at something
different. Reconfirm that there are no reflective materials in the surroundings.
3. Cover the sensor's right half with metal that can block radio wave (such as aluminum foil) in
order to reset the driving learning values (approximately 10 seconds).
Fig. 38: Covering Sensor With Metal

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
When the reset is completed, the buzzer sounds for 10 seconds.