Identifying condition LEXUS LS430 2003 Factory Owner's Guide

Fig. 155: Identifying Location Of Fuse (P-ACC)
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OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR CONDITIONING
AMPLIFIER - BATTERY)
CIRCUIT DESCRIPTION
The blower motor is operated by signals from the A/C amplifier assy. Blower motor speed signals are
transmitted by changes in the duty ratio.
Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of continuity
in one cycle, B is the period of non-continuity.
The blower motor controller controls the blower motor speed.

Fig. 158: Identifying Location Of Fuse (Heater)
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OK: Go to next step
5.CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - AIR CONDITIONING
AMPLIFIER) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance according to the value (s) in the table below.
Standard:
BLOWER MOTOR - AIR CONDITIONING AMPLIFIER RESISTANCE
Tester connectionConditionSpecified condition
A11-5 (BLW) -B2-2 (SI)AlwaysBelow 1 ohms
A11-5 (BLW) - Body groundAlways10 kohms or higher

Fig. 166: Identifying Location Of Fuse (RR ECU-B)
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NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO
FAILURE FUSE (RR ECU-B)
OK: Go to next step
2.INSPECT REAR AIR CONDITIONING AMPLIFIER (R-B - BODY GROUND)
a. Remove the rear A/C amplifier assy and disconnect the connector.
b. Measure the voltage according to the value (s) in the table below.
Standard:
REAR AIR CONDITIONING AMPLIFIER (R-B - BODY GROUND) VOLTAGE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (REAR AIR CONDITIONING
AMPLIFIER -BATTERY)
Tester connectionConditionSpecified condition
A46-3 (R-B) - Body groundAlways10 to 14 V

a. Measure the resistance according to the value (s) in the table below.
Standard:
LUGGAGE ROOM J/B - REAR MAGNETIC VALVE VOLTAGE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Fig. 187: Identifying Terminals Of R38 Rear Magnetic Valve Connector

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OK: Go to next step
4.INSPECT REAR MAGNETIC VALVE
Tester connectionConditionSpecified condition
R38-1 - Body groundIgnition switch OFF --> ONBelow 1 V --> 10 V to 14 V

a. Remove the rear magnetic valve.
b. Check the air passage through the valve with and without the battery positive voltage applied
between terminals as shown in the chart.
Standard:
REAR MAGNETIC VALVE SPECIFIED CONDITION
NG: REPLACE REAR MAGNETIC VALVE
Fig. 188: Identifying Terminals Of Rear Magnetic Valve

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OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (REAR MAGNETIC VALVE -
LUGGAGE ROOM J/B ECU)
ConditionSpecified condition
Apply B+ between terminalsFree passage
No Apply B+ between terminalsNo passage

Fig. 192: Identifying Terminals Of S47 Smoke Sensor Connector
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OK: Go to next step
4.CHECK HARNESS AND CONNECTOR (LUGGAGE ROOM J/B - SMOKE SENSOR) (SEE
ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance according to the value (s) in the table below.
Standard:
LUGGAGE ROOM J/B - SMOKE SENSOR RESISTANCE
Tester connectionConditionSpecified condition
L14-16 (SMOK) - S47-2AlwaysBelow 1 ohms
L14-16 (SMOK) - Body groundAlways10 kohms or higher

Fig. 8: Problem Symptoms Table
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HINT:
Inspect the connectors from the back side while connectors are connected.
SUSPENSION CONTROL ECU:
Fig. 9: Identifying Suspension Control ECU Connector Terminals

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TERMINALS NUMBER AND SPECIFIED CONDITION
Symbols
(Terminals No.)Wiring
ColorTerminal DescriptionConditionSpecified
Condition
B (A20-1) - GND
(A20-4)W-R - W-
BBatteryAlways10 to 14 V
VT (A20-3) -
GND (A20-4)Y - W-B
Absorber control
indicator lamp output
signalIG switch ON, absorber control
switch "SPORT"0 to 1.5 V
VT (A20-3) -
GND (A20-4)Y - W-B
Absorber control
indicator lamp output
signalIG switch ON, absorber control
switch "NORM"10 to 14 V
GND (A20-4) -
Body groundW-B -
Body
ground
GroundAlwaysBelow 1
ohms
SLEX (A20-5) -
GND (A20-4)V-Y - W-BExhaust solenoid valveIG switch ONBelow 1 V
SLEX (A20-5) -
GND (A20-4)V-Y - W-BExhaust solenoid valveEngine idling, absorber control
switch from "HIGH" to "NORM"8 V or more
RC (A20-6) -
GND (A20-4)Y-R - W-BAIR SUS relayIG switch ONBelow 1 V

Fig. 10: Identifying DLC3 Connector Terminals
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TERMINALS NUMBER AND SPECIFIED CONDITION
Symbols (Terminals No.)Terminal DescriptionConditionSpecified
Condition
SIL (7) - SG (5)Bus "+" lineDuring
communicationPulse generation
CG (4) - Body groundChassis groundAlwaysBelow 1 ohms
SG (5) - Body groundSignal groundAlwaysBelow 1 ohms
BAT (16) - Body groundBattery positiveAlways11 to 14 V
CANH (6) - CANL (14)HIGH-level CAN bus
lineIG switch OFF54 to 67 ohms
CANH (6) - Battery positiveHIGH-level CAN bus
lineIG switch OFF1 Mohms or higher
CANH (6) - CG (4)HIGH-level CAN bus
lineIG switch OFF3 Kohms or higher
CANL (14) - Battery
positiveLOW-level CAN bus
lineIG switch OFF1 Mohms or higher

NG: Go to step 3
OK: REPLACE SUSPENSION CONTROL ECU (SEE REPLACEMENT
)
3.CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SENSOR SUB-ASSY POWER
SOURCE) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Disconnect the height control sensor sub-assy connector.
b. Turn the ignition switch to the ON position.
c. Measure the voltage according to the value (s) in the table below.
TESTER CONNECTION STANDARD SPECIFIED CONDITION (FRONT RH)
Fig. 22: Identifying Front Height Control Sensor Sub
-Assy Connector Terminals
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TESTER CONNECTION STANDARD SPECIFIED CONDITION Standard (Front LH)
Tester ConnectionSpecified Condition
H14-1 (SHB) - H14-4 (SHG)4.5 to 5.5 V
Tester ConnectionSpecified Condition
H13-1 (SHB) - H13-4 (SHG)4.5 to 5.5 V

Fig. 23: Identifying Height Control Sensor Sub-Assy Connector Terminals - RH
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TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (Rear RH)
TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (REAR LH)
Tester ConnectionSpecified Condition
H31-1 (SHB) - H31-3 (SHG)4.5 to 5.5 V
Tester ConnectionSpecified Condition
H30-1 (SHG) - H30-3 (SHB)4.5 to 5.5 V