2003 LEXUS LS430 air condition

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

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NG: REPLACE SMOKE SENSOR
OK: Go to next step
3.CHECK HARNESS AND CONNECTOR (BATTERY - SMOKE SENSOR) (SEE ELECTRONIC
CIRCUIT INSPECTION PROCEDURE )
a. Measure the resistance according to the value (s) in the table below.
Standard:
BATTERY - SMOKE SENSOR RESISTANCE
b. Measure the voltage according to the value (s) in the table below.
Standard:
BATTERY - SMOKE SENSOR VOLTAGE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Tester connectionConditionSpecified condition
S47-1 (GND) - Body groundAlwaysBelow 1 ohms
Tester connectionConditionSpecified condition
S47-3 (+B) - Body groundIG ON10 to 14 V

Fig. 194: Intelligent Swing Register Circuit
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INSPECTION PROCEDURE
1.INSPECT AIR CONDITIONING AMPLIFIER
a. Remove the A/C amplifier with connectors still connected.
b. Measure the voltage according to the value (s) in the table below.
Standard:
AIR CONDITIONING AMPLIFIER VOLTAGE
Specified

NG: Go to STEP 2
Fig. 195: Inspecting Air Conditioning Amplifier

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OK: Go to STEP 3
2.INSPECT INTELLIGENT SWING REGISTER STEP MOTOR
a. Remove the intelligent swing register.
b. Measure the resistance according to the value (s) in the table below.
Standard:
INTELLIGENT SWING REGISTER STEP MOTOR RESISTANCE
Tester connectionConditioncondition
A12-24 (PS+B) -
Body groundTurn the ignition switch to ON position Turn the mode selector to
FACE or B/L position Swing switch is pressed10 to 14 V
Tester connectionConditionSpecified condition
I18-9 - I18-3 (2)Always279 to 321 ohms

HINT:
(): Passenger side
NG: REPLACE INTELLIGENT SWING REGISTER
Fig. 196: Inspecting Intelligent Swing Register Step Motor

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OK: Go to next step
3.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - INTELLIGENT
SWING REGISTER) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance according to the value (s) in the table below.
Standard:
I18-9 - I18-4 (1)Always279 to 321 ohms
I18-9 - I18-5 (6)Always279 to 321 ohms
I18-9 - I18-10 (7)Always279 to 321 ohms

AIR CONDITIONING AMPLIFIER - INTELLIGENT SWING REGISTER RESISTANCE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Tester connectionConditionSpecified condition
A12-1 (DS1) - I18-3AlwaysBelow 1 ohms
A12-1 (DS1) - Body groundAlways10 kohms or higher
A12-2 (DS2) - I18-4AlwaysBelow 1 ohms
A12-2 (DS2) - Body groundAlways10 kohms or higher
A12-8 (DS3) - I18-5AlwaysBelow 1 ohms
A12-8 (DS3) - Body groundAlways10 kohms or higher
A12-9 (DS4) - I18-10AlwaysBelow 1 ohms
A12-9 (DS4) - Body groundAlways10 kohms or higher
A12-24 (PS+B) - I18-9AlwaysBelow 1 ohms
A12-24 (PS+B) - Body groundAlways10 kohms or higher
A12-3 (PS1) - I18-2AlwaysBelow 1 ohms
A12-3 (PS1) - Body groundAlways10 kohms or higher
A12-4 (PS2) - I18-1AlwaysBelow 1 ohms
A12-4 (PS2) - Body groundAlways10 kohms or higher
A12-5 (PS3) - I18-6AlwaysBelow 1 ohms
A12-5 (PS3) - Body groundAlways10 kohms or higher
A12-6 (PS4) - I18-7AlwaysBelow 1 ohms
A12-6 (PS4) - Body groundAlways10 kohms or higher

Fig. 197: Checking Harness And Connector (Air Conditioning Amplifier - Intelligent Swing
Register)