Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 21q2h73z b1785
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05-1066
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM 05IWV-03
DTC B1785 OCCUPANT CLASSIFICATION SENSOR
FRONT LH COLLISION DETECTION
CIRCUIT DESCRIPTION
DTC B1785 is output when the occupant classification ECU receives a collision detection signal sent by the
occupant classification sensor front LH if an accident occurs.
DTC B1785 is also output when the seat adjuster frame assy is subjected to a strong impact, even if an actual
accident does not occur.
However, when the occupant classification ECU outputs a collision detection signal, even if the vehicle is
not in a collision, DTC B1785 can be cleared by "Zero point calibration" and "Sensitivity check".
Therefore, if DTC B1785 is output, first perform "Zero point calibration" and "Sensitivity check".
DTC No. DTC Detecting Condition Trouble Area
S Seat adjuster frame assy malfunction S Occupant classification ECU
B1785 S Occupant classification ECU malfunction S Seat adjuster frame assy
S Occupant classification sensor front LH senses a large load (Occupant classification sensor front LH)
HINT:
When DTC B1150/23 is detected as a result of troubleshooting for the supplemental restraint system, per-
form troubleshooting for DTC B1785 of the occupant classification system.
WIRING DIAGRAM
See page 05-1038 .
INSPECTION PROCEDURE
1 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.
NG Go to step 4
OK
2 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 4
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1249
05-1067
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
3 CHECK DTC
(a) Turn the ignition switch to the ON position.
(b) Clear the DTCs stored in memory (see page 05-777 ).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assy center.
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position.
(e) Using the hand-held tester, check the DTCs (see page 05-777 ).
OK:
DTC B1785 is not output.
HINT:
Codes other than code B1785 may be output at this time, but they are not related to this check.
NG Go to step 4
OK
END
4 REPLACE SEAT ADJUSTER FRAME ASSY
(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 seat adjuster frame assy (see page 72-30 ).
HINT:
Perform the inspection using parts from a normal vehicle if possible.
NEXT
5 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.
NG Go to step 8
OK
6 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
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1250
05-1068
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
7 CHECK DTC
(a) Turn the ignition switch to the ON position.
(b) Clear the DTCs stored in memory (see page 05-777 ).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assy center.
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position.
(e) Using the hand-held tester, check the DTCs (see page 05-777 ).
OK:
DTC B1785 is not output.
HINT:
Codes other than code B1785 may be output at this time, but they are not related to this check.
NG Go to step 8
OK
END
8 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 ).
NEXT
9 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.
NEXT
10 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 : 1251
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