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DI-486
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI1NV-15
DTC Normal Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly 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.
The diagnosis system malfunction display for this circuit is different from other circuits that is when the SRS
warning light remains lit up and the DTC is a normal code, source voltage drop is indicated.
Malfunction in this circuit is not recorded in the airbag sensor assembly, and the source voltage returns to
normal, the SRS warning light automatically goes off.
DTC No. Diagnosis
(Normal) Source voltage drop
2001 SIENNA (RM787U)
Author : Date : 640
DI-487
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
WIRING DIAGRAM
Airbag Sensor Assembly
Driner Side J/B No. 1
Ignition Switch
6 2 6
ACC 3 L 15A GR
1K 1N C5 ACC
CIG
W-L 2
IG1
AM1
Driner Side J/B No. 1
3 4 B-O 5
6 B-R 5A
7 1K 1N C5 IG2
IG2
AM2 IGN
ST2
W-R
Driner Side J/B No. 1 Engine Room J/B No. 2
5 5 4 3
W 30A
1K 1B 2L 2B
AM2
Driner Side J/B No. 1 Engine Room J/B No. 2
2 2 40A 1 1 2 2 W
W
1K 1B 2L 2D
AM1
W
Fusible Link Block
FL MAIN 3.0 W
B-L 1 140A 100A 4
F8 F8
ALT INP
Driner Side J/B No. 1
4 3 27
W-B W-B
1V 1N C5 E1
Battery
IG Left Cowl Side Panel
H02752
2001 SIENNA (RM787U)
Author : Date : 641
DI-488
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE
1 Prepare for inspection.
LOCK Airbag PREPARATION:
Sensor (a) Disconnect negative (-) terminal cable from the battery,
Assembly and wait at least for 90 seconds.
P Squib (b) Remove the steering wheel pad (See page SR-1 1).
(c) Disconnect the connector of the front passenger airbag
D Squib assembly (See page RS-27 ).
Spiral
(d) Disconnect the connector of the side airbag assembly RH
Cable
and LH (See page RS-39 ).
Front Airbag (e) Disconnect the connector of the seat belt pretensioner
Sensor (LH) RH and LH (See page BO-154 ).
(f) Disconnect the connectors of the airbag sensor assembly
Front Airbag
(See page RS-52 ).
Sensor (RH)
(g) Disconnect the connector of the front airbag sensor RH
P/T Squib (LH) and LH (See page RS-57 ).
(h) Disconnect the connector of the side airbag sensor as-
sembly RH and LH (See page RS-62 ).
Side Airbag CAUTION:
Sensor (LH) Store the steering wheel pad, front passenger airbag as-
sembly and side airbag assemlby with the front surface
Side Squib
(LH) facing upward.
P/T Squib (RH)
Side Airbag
Sensor (RH)
Side Squib
(RH)
H06508
H01026 H06509
2001 SIENNA (RM787U)
Author : Date : 642
DI-489
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
2 Check source voltage.
Airbag Sensor Assembly PREPARATION:
ON Connect negative (-) terminal cable to the battery.
CHECK:
(a) Turn the ignition switch to ON.
ACC IG2 (b) Measure the voltage between body ground and each of
(-) (+) ACC and IG2 on the sensor and operate electric system
(defogger, wiper, headlight, heater blower, etc.).
OK:
AB0119
H01298 H01299 Voltage: 10 - 14 V
NG Check harness between battery and airbag sen-
sor assembly, and check battery and charging
system.
OK
3 Does SRS warning light turn off?
PREPARATION:
(a) Turn the ignition switch to LOCK.
ON
(b) Connect the steering wheel pad connector.
(c) Connect the front passenger airbag assembly connector.
(d) Connect the side airbag assembly connectors.
(e) Connect the seat belt pretensioner connectors.
(f) Connect the airbag sensor assembly connectors.
(g) Connect the front airbag sensor connectors.
H01249 (h) Connect the side airbag sensor assembly connectors.
(i) Turn the ignition switch to ON.
CHECK:
Operate electric system (defogger, wiper, headlight, heater
blower, etc.) and check that SRS warning light goes off.
NO Check for DTCs. If a DTC is output, perform trou-
bleshooting for the DTC. If a normal code is out-
put, replace airbag sensor assembly.
YES
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.
2001 SIENNA (RM787U)
Author : Date : 643
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