Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 21q2h73z b1794
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05-1093
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM 05NTD-01
DTC B1794 OCCUPANT CLASSIFICATION ECU
BATTERY POSITIVE LINE OPEN
CIRCUIT DESCRIPTION
This circuit consists of the occupant classification ECU and the power source circuit (battery, fuse, wire har-
ness).
DTC B1794 is recorded when a malfunction is detected in the occupant classification ECU or the power
source circuit.
HINT:
When DTC B1794 is output after switching the ignition switch LOCK-ON-LOCK 50 times in a row when a
malfunction occurs in the power circuit for the occupant classification system, the DTC is output again when
a malfunction is detected even once after being cleared, unless the normal system code is input.
DTC No. DTC Detecting Condition Trouble Area
S The ignition switch is turned from LOCK to ON, hold for 10 S Battery
seconds or more, and back to LOCK again 50 times in a S ECU-B Fuse
B1794 row when a malfunction occurs in the power circuit for the S Floor wire
occupant classification system. S Front seat wire RH
S Occupant classification ECU malfunction S Occupant classification ECU
HINT:
When DTC B1650/32 is detected as a result of troubleshooting for the supplemental restraint system, per-
form troubleshooting for DTC B1794 of the occupant classification system.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1276
05-1094
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
WIRING DIAGRAM
Occupant
Engine Room J/B Classification ECU
J/C
1 AM2 1 33 16
W-R W-R
2D 2H J3 J4
Short-Pin ECU-B 8
W-L
2C
1 2
Driver Side J/B
7 24
W-L W-L I15
1L 1C
Ignition SW
22 IGN 27
B-O B W-R
1H 1H
6 IG2 AM2 5
8
B-O B-O
BM1
J/C (*2) (*2)
7 19 2 7
B-O B-O B-O
J33 J34 BO1 O3 IG
(*1) (*1)
4
W-L W-L
J19 BM1
(*2) (*2)
J/C
20 8 1 1
W-L W-L W-L W-L
J33 J34 BO1 O3 +B
54 44 (*1) (*1)
6
W-B
BM1
(*2)
FL Block 6 3
1 1 W-B
W B BO1 O3 GND
F8 F6 (*1)
FL MAIN
W-B W-B
(*2) (*1)
Battery
BI
*1: w/ Power Seat
*2: w/o Power Seat
H45985
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1277
05-1095
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE
1 CHECK BATTERY
(a) Measure the voltage of the battery.
Standard: 11 to 14 V
NG REPLACE BATTERY
OK
2 CHECK FUSE
(a) Check the ECU-B fuse.
Standard: Below 1
NG REPLACE FUSE
OK
3 CHECK WIRE HARNESS
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the bat-
O3 tery, and wait for at least 90 seconds.
GND
(c) Disconnect the connector from the occupant classifica-
+B
tion ECU.
(d) Connect the negative (-) terminal cable to the battery.
IG (e) Turn the ignition switch to the ON position.
(f) Measure the voltage and resistance according to the val-
H43111 ue(s) in the table below.
Standard:
Tester connection Condition Specified condition
O3-1 (+B) -
Ignition switch ON 10 to 14 V
Body ground
O3-7 (IG) -
Ignition switch ON 10 to 14 V
Body ground
O3-3 (GND) -
Always Below 1
Body ground
NG REPAIR OR REPLACE WIRE HARNESS
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1278
05-1096
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
4 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, and wait for at least 10 seconds.
(e) Using the hand-held tester, check the DTCs of the occupant classification ECU (see page 05-777 ).
OK:
DTC B1794 is not output.
HINT:
Codes other than code B1794 may be output at this time, but they are not related to this check.
NG Go to step 5
OK
USE SIMULATION METHOD TO CHECK (SEE PAGE 05-770 )
5 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
6 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 the "Zero point calibration" (see page 05-767 ).
OK:
The "COMPLETED" is displayed.
NEXT
7 PERFORM SENSITIVITY CHECK
(a) Using the hand-held tester, perform the "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 : 1279
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