Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 21q2h73z b1787
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05-1072
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM 05IWX-03
DTC B1787 OCCUPANT CLASSIFICATION SENSOR
REAR LH COLLISION DETECTION
CIRCUIT DESCRIPTION
DTC B1787 is output when the occupant classification ECU receives a collision detection signal sent by the
occupant classification sensor rear LH if an accident occurs.
DTC B1787 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 B1787 can be cleared by "Zero point calibration" and "Sensitivity check".
Therefore, if DTC B1787 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
B1787 S Occupant classification ECU malfunction S Seat adjuster frame assy
S Occupant classification sensor rear LH senses a large load (Occupant classification sensor rear LH)
HINT:
When DTC B1150/23 is detected as a result of troubleshooting for the supplemental restraint system, per-
form troubleshooting for DTC B1787 of the occupant classification system.
WIRING DIAGRAM
See page 05-1052 .
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 : 1255
05-1073
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 B1787 is not output.
HINT:
Codes other than code B1787 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 : 1256
05-1074
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 B1787 is not output.
HINT:
Codes other than code B1787 may be output at this time, but they are not related to this check.
SST 09843-18040
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 : 1257
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