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05-1 104
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM 05NTE-01
TROUBLE IN INDICATOR OF PASSENGER AIRBAG ON/OFF
INDICATOR
CIRCUIT DESCRIPTION
The occupant classification system detects the front passenger seat condition. It then informs a passenger
of the front passenger airbag assembly condition (activated/not activated) by the passenger airbag ON/OFF
indicator.
The table below shows the normal indication condition of the passenger airbag ON/OFF indicator and the
front pasenger seat condition.
Front passenger seat condition ON Indicator OFF Indicator
Adult is seated. ON OFF
Child is seated. OFF ON
Vacant OFF OFF
Occupant classification system failure OFF ON
INSPECTION PROCEDURE
1 CHECK SRS WARNING LIGHT
(a) Turn the ignition switch to the ON position, and check the SRS warning light condition.
HINT:
If this trouble occurs, the SRS warning light is off. If it is on, a DTC is output. Troubleshoot for the output DTC.
OK:
The SRS warning light does not come on.
NG CHECK DTC (SEE PAGE 05-777 )
OK
2 CHECK PASSENGER AIRBAG ON/OFF INDICATOR
(a) Turn the ignition switch to the ON position.
(b) Check if the passenger airbag ON/OFF indicator correctly indicates the front passenger seat condition.
OK:
Front passenger seat condition ON Indicator OFF Indicator
Adult is seated. ON OFF
Child is seated. OFF ON
Vacant OFF OFF
Occupant classification system failure OFF ON
NG Go to step 3
OK
END
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1287
05-1 105
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
3 PERFORM ZERO POINT CALIBRATION
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Using the hand-held tester, perform "Zero point calibration" (see page 05-767 ).
OK:
The "COMPLETED" is displayed on the tester screen.
NG Go to step 5
OK
4 PERFORM SENSITIVITY CHECK
(a) Using the hand-held tester, perform "Sensitivity check" (see page 05-767 ).
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NG Go to step 5
OK
END
5 RETIGHTEN FRONT SEAT ASSEMBLY RH BOLT (SEE PAGE 72-30 )
(a) Turn the ignition switch to the LOCK position.
(b) Loosen the 4 installation bolts of the front seat assembly RH.
(c) Tighten the 4 installation bolts of the front seat assembly RH to the specified torque.
Torque: 37 Nm (377 kgfcm, 27 ftlbf)
NEXT
6 PERFORM ZERO POINT CALIBRATION
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Using the hand-held tester, perform "Zero point calibration" (see page 05-767 ).
OK:
The "COMPLETED" is displayed on the tester screen.
NG Go to step 8
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1288
05-1 106
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
7 PERFORM SENSITIVITY CHECK
(a) Using the hand-held tester, perform "Sensitivity check" (see page 05-767 ).
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NG Go to step 8
OK
END
8 CHECK CONNECTOR
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Check the connectors are properly connected to the occupant classification ECU and the 4 occupant
classification sensors.
OK:
The connectors are connected.
(d) Disconnect the connectors from the occupant classification ECU and the 4 occupant classification sen-
sors.
(e) Check the connectors are not damaged or deformed.
OK:
The connectors are normal.
NG REPAIR OR REPLACE CONNECTOR, THEN GO
TO STEP 1
OK
9 CHECK DTC
(a) Connect the connectors to the occupant classification ECU and the 4 occupant classification sensors.
(b) Connect the negative (-) terminal cable to the battery.
(c) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(d) Clear the DTCs stored in memory (see page 05-777 ).
(e) Turn the ignition switch to the LOCK position.
(f) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(g) Check the DTCs (see page 05-777 ).
OK:
DTC is not output.
NG REPLACE AIR BAG SENSOR ASSY CENTER
(SEE PAGE 60-56 )
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1289
05-1 107
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
10 REPLACE OCCUPANT CLASSIFICATION ECU
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Replace the occupant classification ECU (see page 60-67 ).
HINT:
Perform the inspection using parts from a normal vehicle if possible.
NEXT
11 PERFORM ZERO POINT CALIBRATION
(a) Connect the negative (-) terminal cable to the battery.
(b) Connect the hand-held tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Using the hand-held tester, perform "Zero point calibration" (see page 05-767 ).
OK:
The "COMPLETED" is displayed on the tester screen.
NEXT
12 PERFORM SENSITIVITY CHECK
(a) Using the hand-held tester, perform "Sensitivity check" (see page 05-767 ).
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NEXT
END
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1290
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