Combination LEXUS LS430 2003 Factory Owner's Manual

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Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - COMBINATION
METER ASSY) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Disconnect the suspension control ECU A20 connector.
b. Disconnect the combination meter assy C12 connector.
c. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION STANDARD SPECIFIED CONDITION
Tester ConnectionSpecified Condition
A20-3 (VT) - C12-6Below 1 ohms
A20-3 (VT) - Body ground10 Kohms or higher

Fig. 146: Identifying Combination Meter Assy Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK:Go to next step
2.CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - BODY GROUND)
(SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION STANDARD SPECIFIED CONDITION
Tester ConnectionSpecified Condition
C12-11 - Body groundBelow 1 ohms

Fig. 147: Identifying Combination Meter Assy Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
By connecting terminals OPB and CG of the DLC3, vehicle height control is not carried out.
WIRING DIAGRAM

REPLACEMENT
HINT:
See COMPONENTS
See LOCATION
Installation is in the reverse order of removal.
1.REMOVE REAR COMBINATION LAMP SERVICE COVER RH (See OVERHAUL
)
2.REMOVE REAR COMBINATION LAMP SERVICE COVER LH (See OVERHAUL
)
3.REMOVE LUGGAGE COMPARTMENT LAMP ASSY NO. 1 (See step 4 on OVERHAUL
)
4.REMOVE BACK DOOR TRIM COVER (See step 5 on OVERHAUL
)
5.REMOVE LUGGAGE OPENER CANCEL CYLINDER & KEY SET (See OVERHAUL
)
6.REMOVE LUGGAGE DOOR OPENING SWITCH ASSY (See OVERHAUL
)
7.REMOVE LUGGAGE COMPARTMENT DOOR GARNISH SUB-ASSY OUTSIDE (See step 5 on
REPLACEMENT
)
8.REMOVE TELEVISION CAMERA ASSY
a. Disconnect the connector.
b. Remove the 2 bolts and television camera assy.
9.INSTALL TELEVISION CAMERA ASSY
a. Install the television camera assy with the 2 bolts.
b. Connect the connector.

Symbols (Terminal
No.)Wiring
Color
Terminal DescriptionConditionSpecification
WFL+ (S28-3) - GND
(S30-16)LG - W-BSound signal (Front
Left)Audio system is playing-
WFR+ (S28-4) - GND
(S30-16)Y - W-BSound signal (Front
Right)Audio system is playing-
WFL-(2) (S28-9) -
GND (S30-16)L - W-BSound signal (Front
Left)Audio system is playing-
WFR-(2) (S28-10) -
GND (S30-16)B - W-BSound signal (Front
Right)Audio system is playing-
MUTE (S29-1) - GND
(S30-16)Y - W-BMute signal from radio
receiverAudio system is
sounding --> ChangingAbove 3.5 V -->
Below 3.5 V
L- (S29-2) - GND
(S30-16)G - W-BSound signal from
radio receiver (Left)Audio system is playing-
L+ (S29-3) - GND
(S30-16)R - W-BSound signal from
radio receiver (Left)Audio system is playing-
R- (S29-4) - GND
(S30-16)W - W-BSound signal from
radio receiver (Right)Audio system is playing-
R+ (S29-5) - GND
(S30-16)B - W-BSound signal from
radio receiver (Right)Audio system is playing-
TX-(1), MTX-(2) (S29-
7) - GND (S30-16)LG - W-BAVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
TX+(1), MTX+(2)
(S29-8) - GND (S30-
16)L - W-BAVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
ACC (S29-12) - GND
(S30-16)GR - W-BAccessory (ON)Turn ignition switch to
OFF --> ACCBelow 1 V -->
10 to 14 V
SPD (S29-11) - GND
(S30-16)O - W-BSpeed signal from
combination meterVehicle is drivingPulse generation
TXD-(1), RTX-(2)
(S29-19) - GND (S30-
16)R - W-B ((5))AVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
TXD+(1), RTX+(2)
(S29-20) - GND (S30-
16)G - W-B ((5))AVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
N-MUT(1), N-MU(2)
(S29-21) - GND (S30-
16)SB - W-B
(
(3))
Mute signal from radio
receiverAudio system is
sounding --> ChangingAbove 3.5 V -->
Below 3.5 V
TMUT (S29-24) -
GND (S30-16)LG - W-BMute signal from radio
receiverAudio system is
sounding --> ChangingAbove 3.5 V -->
Below 3.5 V
B+(1), +B(2) (S30-1) -
GND (S30-16)L-R - W-BBatteryAlways10 to 14 V
FL+ (S30-4) - GND LG(3), P(4) - Sound signal (Front Audio system is playing-

Fig. 66: Identifying Stereo Components Tuner Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
This circuit is necessary for the stereo component amplifier assy for the ASL (Auto Sound Leveliser). Speed
signals are received from the combination meter.
The ASL function automatically adjusts the sound data in order to enable to hear the clear audio sound even
when the vehicle noise is increased (as vehicle noise increased, the volume is turned up etc.)
Standard System: Using speed signals and a microphone for the ASL built into the stereo component amplifier
assy.
Mark Levinson System: Using speed signals.

WIRING DIAGRAM
Fig. 67: Identifying Stereo Component Amplifier Assy Wiring Diagram

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INSPECTION PROCEDURE
1.CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSY -
COMBINATION METER ASSY)
a. Disconnect the connectors from the stereo component amplifier assy S29 and combination meter
assy C12.
b. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION CONDITION CHART
Tester connectionConditionSpecified condition
SPD - +SAlwaysBelow 1 ohms
SPD - Body groundAlways10 kohms or higher

Fig. 70: Identifying Combination Meter Assembly Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: Go to next step
2.INSPECT COMBINATION METER ASSY
a. Check the voltage.
1. Jack up either of the front wheels.
2. Adjust the shift lever to the neutral position.
3. Measure the voltage between the terminals +S and body ground while turning the front wheel
slowly.
Standard:

TESTER CONNECTION CONDITION CHART
Fig. 71: Inspecting Combination Meter Assy

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Tester connectionConditionSpecification
+S - Body groundIgnition switch ONVoltage is pulsed

Fig. 72: Identifying Blinking Pattern
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NG: GO TO COMBINATION METER SYSTEM (SEE PRECAUTION
)
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
This circuit sends the signal to the stereo component amplifier to mute the noise. Because of that, the noise
produced by changing the sound source ceases.
In addition, this circuit is used to mute the sound when the navigation system performs voice guide.
If there is an open in the circuit, noise can be heard from the speaker when changing the sound source.
When the vehicle is equipped with the navigation system, audio sound keeps coming out from the speaker on
the driver's side while the voice navigation is in operation.
If there is a short in the circuit, even though the stereo component amplifier assy is normal, no sound or only
extremely small sound can be produced.
WIRING DIAGRAM