warning LEXUS LS430 2003 Factory Service Manual

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Fig. 123: Identifying Skid Control ECU Terminals

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OK: Go to next step
6.INSPECT BRAKE FLUID LEVEL WARNING SWITCH
a. Remove the reservoir tank cap and strainer.
S42-28 (PKB) - Body ground1M ohms or higher

b. Disconnect the brake fluid level warning switch connector.
c. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
NG: REPLACE BRAKE FLUID LEVEL WARNING SWITCH
Fig. 124: Identifying Brake Fluid Level Warning Switch Terminals

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OK: Go to next step
7.CHECK HARNESS OR CONNECTOR (BRAKE FLUID LEVEL WARNING SWITCH SKID
CONTROL ECU)
Tester ConnectionSwitch ConditionSpecified Condition
(B1-1) - (B1-2)Float UP1M ohms or higher
(B1-1) - (B1-2)Float DOWNBelow 1 ohms

a. Disconnect the skid control ECU connector and the brake fluid level warning switch connector.
b. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
c. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Tester ConnectionSpecified Condition
S42-10 (LBL) - (B1-1)Below 1 ohms
Tester ConnectionSpecified Condition
S42-10 (LBL) - Body ground1 Mohms or higher

B: REPAIR CAN COMMUNICATION SYSTEM (SEE PRECAUTION )
A: Go to next step
4.INSPECT COMBINATION METER ASSEMBLY (SLIP INDICATOR LIGHT) (SEE PROBLEM
SYMPTOMS TABLE )
NG: REPAIR OR REPLACE COMBINATION METER ASSEMBLY
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
The skid control buzzer sounds and VSC warning (Multi-information display) comes ON during VSC
operation.
WIRING DIAGRAM
DTC is outputB

VEHICLE CONDITION / TEST DETAILS
d. Check that skid control buzzer sounds by operating with the hand-held tester.
OK: Go to next step
The skid control buzzer sounds in accordance with operation of the hand-held tester.
NG: Go to step 2
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
2.INSPECT SKID CONTROL BUZZER
a. Disconnect the skid control buzzer connector.
b. Apply a battery positive voltage to terminals 1 and 2 of the skid control buzzer connector, and
check that the buzzer sounds.
OK: Go to next step
The skid control buzzer sound is heard.
NG: REPLACE SKID CONTROL BUZZER
ItemVehicle Condition / Test DetailsDiagnostic Note
VSC / BR WARN BUZTurns VSC / BRAKE warning buzzer ON / OFFBuzzer can be heard

Standard:
TESTER CONNECTION SPECIFIED CONDITION
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
Connecting terminals TC and CG of the DLC3 causes the ECU to display the DTC by blinking the ABS
warning light.
WIRING DIAGRAM
Tester ConnectionSpecified Condition
S42-30 (BZ) - Body ground1 Mohms or higher

Fig. 17: Diagnostic Trouble Code Information Chart (2 Of 2)
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*1: For codes in the "Indicator Light" column with a "circ" mark, the absorber control indicator lamp blinks at 1
second intervals.
*2: For codes in the "Indicator Light" column with a " (xcirc)" mark, when trouble occurs, "HEIGHT HI" is
displayed on the multi-information display. Also, the master warning light is lit on the combination meter and
an alarm sounds.
*3: Since the relief pressure of the compressed air is 980 kPa (10 kgf/cm
2 , 142 psi), if vehicle height control is
attempted on a steeply sloping road, when the vehicle is overloaded, or when the vehicle height is jacked up
with the engine running, code "C1751" may be output and vehicle height control may be suspended. (This is not
abnormal.) In this case, however, when detecting the first error, approximately 10 minutes after the ignition
switch was turned to the ON position, vehicle height control is resumed. When the following errors are
detected, it takes 70 minutes until the control is resumed.
*4: If vehicle height control is operated while the wheels are removed or the vehicle is jacked up, code "C1752"
may be output, but this is not abnormal. When code "C1752" is output, vehicle height control is not carried out.
However, control is resumed if the ignition switch is turned off, then to the ON position again.
CIRCUIT DESCRIPTION
The height control sensor sub-assy controls the resistance value by following changes in vehicle height. The
suspension control ECU detects the change in vehicle height from the transformed voltage. The suspension
control ECU outputs a constant voltage of 5 V to the SHB terminal of the height control sensor sub-assy.
In the height control sensor, the voltage is changed due to resistance. The changed voltage is output from the

Fig. 41: Removing Screws
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5.INSTALL HORN BUTTON ASSY (See step 6 on REPLACEMENT
)
6.INSPECT HORN BUTTON ASSY (See ON
-VEHICLE INSPECTION )
7.SRS WARNING LIGHT (See DIAGNOSIS SYSTEM
)
REPLACEMENT
HINT:
See COMPONENTS - FRONT BUMPER , COMPONENTS - REAR BUMPER .
See LOCATION .
Installation is in the reverse order of removal.
1.REMOVE FRONT BUMPER COVER (See step 5 on REPLACEMENT
)
2.REMOVE REAR BUMPER COVER (See step 12 on REPLACEMENT
)

1.REMOVE SWITCH BASE HOLE COVER (See REPLACEMENT )
2.REMOVE INSTRUMENT PANEL SAFETY PAD SUB-ASSY NO. 1 (See step 19 on
REPLACEMENT
)
3.REMOVE CLEARANCE WARNING BUZZER NO. 1
a. Disconnect the connector.
b. Disengage the clip and remove the clearance warning buzzer No. 1.
Fig. 46: Removing Clearance Warning Buzzer No. 1 Clip

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REPLACEMENT
HINT:
See COMPONENTS - FIXED , COMPONENTS - POWER ADJUSTER , COMPONENTS -BACK
WINDOW GLASS .
See LOCATION .
Installation is in the reverse order of removal.

1.REMOVE REAR SEAT CUSHION ASSY RH (See OVERHAUL - FIXED , OVERHAUL -
POWER SEAT ADJUSTER
)
2.REMOVE REAR SEAT CUSHION ASSY LH (See OVERHAUL
- FIXED , OVERHAUL -
POWER SEAT ADJUSTER
)
3.REMOVE REAR SEAT BACK ASSY LH (See OVERHAUL
- FIXED , OVERHAUL - POWER
SEAT ADJUSTER )
4.REMOVE REAR SEAT BACK ASSY RH (See OVERHAUL
- FIXED , OVERHAUL - POWER
SEAT ADJUSTER )
5.REMOVE REAR DOOR SCUFF PLATE RH (See REPLACEMENT
)
6.REMOVE REAR DOOR SCUFF PLATE LH (See REPLACEMENT
)
7.REMOVE REAR DOOR OPENING TRIM WEATHERSTRIP RH (See REPLACEMENT
)
8.REMOVE REAR DOOR OPENING TRIM WEATHERSTRIP LH (See REPLACEMENT
)
9.REMOVE REAR SEAT SIDE COVER RH (See REPLACEMENT
)
10.REMOVE REAR SEAT SIDE COVER LH (See REPLACEMENT
)
11.REMOVE ROOF SIDE GARNISH INNER RH (See REPLACEMENT
)
12.REMOVE ROOF SIDE GARNISH INNER LH (See REPLACEMENT
)
13.REMOVE CENTER STOP LAMP ASSY (See REPLACEMENT
)
14.REMOVE REAR SPEAKER GRILLE SUB-ASSY (See REPLACEMENT
)
15.PACKAGE TRAY TRIM PANEL ASSY (See REPLACEMENT
)
16.REMOVE CLEARANCE WARNING BUZZER NO. 2
a. Disconnect the connector.
b. Disengage the clip and remove the clearance warning buzzer No. 2.