LEXUS LS430 2003 Factory Repair Manual

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

CIRCUIT DESCRIPTION
This sensor detects the smoke inside the cabin and sends the appropriate signals to the luggage room J/B ECU.
WIRING DIAGRAM
Fig. 189: Smoke Sensor Circuit

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INSPECTION PROCEDURE
1.INSPECT LUGGAGE ROOM J/B ECU (RMGV - BODY GROUND)
a. Remove the luggage room J/B ECU with connectors still connected.
b. Measure the voltage according to the value (s) in the table below when applying or not applying

cigarette smoke.
Standard:
LUGGAGE ROOM J/B ECU (RMGV - BODY GROUND) VOLTAGE
Tester connectionConditionSpecified
condition
L14-16 (SMOK) -
Body groundTurn the ignition switch to ON position Turn the rear A/C mode
to AUTO Apply cigarette smokeAbove 4.0 V
L14-16 (SMOK) -
Body groundTurn the ignition switch to ON position Turn the rear A/C mode
to AUTO Not Apply cigarette smokeBelow 1 V

Fig. 190: Inspecting Luggage Room J/B ECU (RMGV - Body Ground)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Go to STEP 2
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
2.INSPECT SMOKE SENSOR
a. Remove the smoke sensor.
b. Connect the positive (+) lead from the battery to terminal S47-1 and negative (-) lead to terminal
S47-3.
c. Measure the voltage according to the value (s) in the table below.
Standard:
SMOKE SENSOR VOLTAGE
Tester connectionConditionSpecified condition
S47-2 - S47-3There is no smokeBelow 1.0 V
S47-2 - S47-3There is smokeAbove 4.0 V

Fig. 191: Inspecting Smoke Sensor

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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. 192: Identifying Terminals Of S47 Smoke Sensor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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