sensor LEXUS LS430 2003 Factory Repair Manual

If a malfunction occurs in the vehicle speed sensors, stop lamp switch assy, or other related parts during
cruise control driving, the ECM actuates AUTO CANCEL of the cruise control and then the CRUISE
main indicator light starts to blink, informing the driver of the malfunction. At the same time, data of the
malfunction is stored as a diagnostic trouble code (DTC).
Fig. 14: Identifying Blinking Pattern Of CRUISE Main Indicator Light

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1.DTC CHECK
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position.
c. Read the DTCs on the tester screen.
2.DTC CLEAR

The ignition switch must be turned to the ON position to proceed ACTIVE TEST using the hand-held
tester.
ACTIVE TEST DETAIL (COMBINATION METER ASSY)
HINT:
If a trouble code is displayed during the DTC check, check the circuit listed for that code. For details of each
code, refer to chart.
DIAGNOSTIC TROUBLE CODE CHART
Fig. 17: Diagnostic Trouble Code Information Chart

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CIRCUIT DESCRIPTION
See CIRCUIT DESCRIPTION
.
ItemVehicle Condition / Test DetailsDiagnostic Note
CRUISE INDIC"CRUISE" indicator is ON / OFF-
DTCDescription
DTC P0500 VEHICLE SPEED SENSOR CIRCUIT MALFUNCTION
DTC P0503 VEHICLE SPEED SENSOR CIRCUIT MALFUNCTION
DTC P0571 STOP LIGHT SWITCH CIRCUIT MALFUNCTION
DTC P0607 INPUT SIGNAL CIRCUIT MALFUNCTION

This DTC indicates the internal abnormalities of the ECM.
DTC P0607 PROBLEM SYMPTOM DIAGNOSTIC
HINT:
The ECM receives signals from each sensor to control all the functions of the cruise control with the
microcomputer.
When a trouble code is detected, fail-safe remains on until the ignition switch is turned off.
INSPECTION PROCEDURE
1.REPLACE ECM (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
The cruise control main switch operates seven functions: SET, COAST, TAP-DOWN, RESUME, ACCEL,
TAP-UP, and CANCEL. The SET, TAP-DOWN and COAST functions, and the RESUME, TAP-UP and
ACCEL functions are operated with the same switch respectively. The cruise control main switch is an
automatic return type switch which turns on only while operating it in each arrow direction and turns off after
releasing it. The internal contact point of the cruise control main switch is turned on with the switch operation.
Then the ECM reads the resistance value that has been changed by the switch operation to control SET,
COAST, RESUME, ACCEL and CANCEL.
WIRING DIAGRAM
DTC No.Detection ItemTrouble Area
P0607The ECM has a supervisory CPU and a control ECU inside. When
each input STP signal is different for 0.15 sec. or more, this trouble
code is output. This trouble code is output after 0.4 sec. has passed
from the time the cruise cancel input signal (STP input) is input into
the ECM.ECM

3. With the brake pedal depressed, push the cruise control main switch to RES/ACC 3 times within 3
seconds. Check that the VSC buzzer sounds at this time.
REPLACEMENT
1.SEPARATE BATTERY NEGATIVE TERMINAL
2.REMOVE ENGINE UNDER COVER NO. 1 (See REPLACEMENT
)
3.REMOVE FRONT WHEEL OPENING EXTENSION PAD LH (See REPLACEMENT
)
4.REMOVE FRONT FENDER LINER LH (See REPLACEMENT
)
5.REMOVE FRONT WHEEL OPENING EXTENSION PAD RH (See REPLACEMENT
)
6.REMOVE FRONT FENDER LINER RH (See REPLACEMENT
)
7.REMOVE FRONT BUMPER COVER (See step 5 in REPLACEMENT
)
8.REMOVE FRONT BUMPER REINFORCEMENT SUB-ASSY (See step 9 in REPLACEMENT
)
9.REMOVE LASER SENSOR
a. Disconnect the connector and remove the laser sensor.

Fig. 2: Removing Laser Sensor
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10.INSTALL LASER SENSOR
11.INSTALL FRONT BUMPER REINFORCEMENT SUB-ASSY (See step 25 in REPLACEMENT
)
12.ADJUST FOG LIGHT AIM (See ADJUSTMENT
)
13.CHECK FOG LIGHT AIM
14.ADJUST LASER SENSOR (See ADJUSTMENT
)
ADJUSTMENT

HINT:
There is a limitation on laser optical axis adjustment.
Since the laser sensor is installed in the bumper reinforcement, it is important that the laser sensor,
bumper reinforcement, and other related parts are installed properly.
When the sensor is removed from the vehicle for trouble diagnosis or repair, it is necessary to adjust the
laser optical axis after the operation.
1.ADJUST LASER SENSOR
a. Preparation for adjusting the laser optical axis
1. Adjust the tire pressure properly (see INSPECTION
).
2. Luggage in the vehicle, such as in the trunk, should be unloaded.
3. Clean the light-luminous and light-receiving portions of the laser sensor.
HINT:
Prepare a 10 m (32.81 ft) string, with a sharp-pointed weight (plumb bob), and a 5 m (16.41 ft) tape
measure.

REPLACEMENT
1.SEPARATE BATTERY NEGATIVE TERMINAL
2.REMOVE MILLIMETER WAVE RADAR SENSOR ASSY
a. Disconnect the connector.
b. Remove the 3 bolts and millimeter wave radar sensor.
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5c[

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3.INSTALL MILLIMETER WAVE RADAR SENSOR ASSY
a. Install the millimeter wave radar sensor with the 3 bolts.
Torque: 5.5 N.m (56 kgf.cm, 49 in.lbf)
b. Connect the connector.
4.ADJUST MILLIMETER WAVE RADAR SENSOR ASSY (See ADJUSTMENT
)
ADJUSTMENT

1.ADJUST MILLIMETER WAVE RADAR SENSOR ASSY

a. Preparation for adjusting the radar beam axis
1. Adjust the tire pressure properly (see INSPECTION
).
2. Luggage in the vehicle, such as in the trunk, should be unloaded.
b. Adjust the standard vehicle height (vehicle with air suspension) (see INSPECTION
)
c. Adjustment in vertical direction of the millimeter wave radar sensor.
1. Remove dust and oil on the level rack of the millimeter wave radar sensor.
2. Set the specified level on the center of the level rack of the millimeter wave radar sensor.
Fig. 21: Setting Specified Level

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3. Using a hexagon wrench, turn and adjust screw A for vertical adjustment of the millimeter
wave radar sensor so that the air bubble is within the red frame on the level.
Standard:
Adjustable range within the red frame of the level is ± 0.2°.

Fig. 23: Adjustment Direction Chart
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d. Adjust the reflector height
1. Adjust the reflector so that the center of the SST reflector is the same height as the millimeter
wave radar sensor.
SST 09870-60000 (09870-60010, 09870-60040)
HINT:
Prepare a 10 m (32.81 ft) string, with a sharp-pointed weight (plumb bob), and a 5 m (16.41 ft) tape
measure.