Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 21q2h73z cisa2
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05-1 101
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM 05267-07
SOURCE VOLTAGE DROP
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assy center
in case the source voltage drops.
When the battery voltage drops, the voltage-increase circuit (DC-DC converter) functions to increase the
voltage of the SRS to normal voltage.
A malfunction in this circuit is displayed differently from other codes. The source voltage drop is indicated
when the SRS warning light comes on without showing any DTCs.
A malfunction in this circuit is not recorded in the airbag sensor assy center. The SRS warning light automati-
cally goes off when the source voltage returns to normal.
DTC No. Diagnosis
(Normal) Source voltage drop
WIRING DIAGRAM
Airbag Sensor
I15 Assy Center
Ignition SW Driver Side J/B
27 IGN 9 5
W-R B B-O
1H 1E A21 IG2
5 AM2 IG2 6
16 1 27
W-B W-B
1L 1E A21 E1
J/C
16 33
W-R W-R
J4 J3 3 3 28
W-B
1H 1E A21 E2
Engine Room J/B
1 AM2 1
W
2D 2H
1 2
FL Block
1 1
W
F8 F6 W-B W-B
FL MAIN
B
Battery
IE IF
H45986
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1284
05-1 102
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 WIRE HARNESS
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the bat-
tery, and wait for at least 90 seconds.
(c) Disconnect the connector of the airbag sensor assy cen-
IG2 A21 ter.
(d) Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
E2
(e) Turn the ignition switch to the ON position.
E1 H40065 (f) Measure the voltage and resistance according to the val-
ue(s) in the table below.
Standard:
Tester connection Condition Specified condition
A21-5 (IG2) -
Ignition switch ON 10 to 14 V
Body ground
A21-27 (E1) -
Always Below 1
Body ground
A21-28 (E2) -
Always Below 1
Body ground
NG REPAIR OR REPLACE WIRE HARNESS (AIR-
BAG SENSOR ASSY CENTER - BATTERY)
OK
3 CHECK SRS WARNING LIGHT TURN OFF
(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) Connect the airbag sensor assy center connectors.
(d) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(e) Turn the ignition switch to the ON position.
(f) Operate all components of the electrical system (defogger, wiper, headlight, heater blower, etc.) and
check the SRS warning light operation.
OK:
SRS warning light does not come on.
NG REPAIR OR REPLACE WIRE HARNESS
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1285
05-1 103
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
4 CHECK AIR BAG SENSOR ASSY CENTER
(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) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(d) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(e) Clear the stored DTCs in the memory (see page 05-777 ).
(f) Turn the ignition switch to the LOCK position.
(g) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(h) Check the DTCs (see page 05-777 ).
OK:
DTC is not output.
NG REPLACE AIR BAG SENSOR ASSY CENTER
(SEE PAGE 60-56 )
OK
USE SIMULATION METHOD TO CHECK (SEE PAGE 05-770 )
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1286
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