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2003 TOYOTA TACOMA (EWD517U)
160
SRS
The SRS is a driver protection device which has a supplemental role to the seat belts.
When the ignition SW is turned to ACC or ON, the current from the ACC fuse flows to TERMINAL (B) 6 of the center airbag
sensor assembly. Only when the ignition SW on, the current from the IGN fuse flows to TERMINAL (B) 5 of the center airbag
sensor assembly.
If an accident occurs while driving, deceleration caused by a frontal impact is detected (by sensor) and when the frontal
impact exceeds a set level, the current from the ACC or IGN fuse flows to TERMINALS (B) 6 or (B) 5 of the center airbag
sensor assembly. This current flows to TERMINAL (B) 14 to TERMINAL 1 of the airbag squib (Steering wheel pad) to
TERMINAL 2 to TERMINAL (B) 13 of the center airbag sensor assembly, and also flows to TERMINAL (B) 10 of the center
airbag sensor assembly to TERMINAL 2 of the airbag squib (Front passenger airbag assembly) to TERMINAL 1 of the
center airbag assembly (Double cab) or TERMINAL (B) 10 of the center airbag sensor assembly to TERMINAL 1 of the
passenger airbag manual on/off SW to TERMINAL 3 to TERMINAL 1 of the airbag squib (Front passenger airbag assembly)
to TERMINAL 2 to TERMINAL 2 of the passenger airbag manual on/off SW to TERMINAL 4 to TERMINAL (B) 11 of the
center airbag sensor assembly (Except double cab). Furthermore, the current flows to TERMINAL (B) 27 or (B) 28 to
GROUND, causing the center airbag squibs to expand.
When the safing sensor built into the center airbag sensor assembly is on, airbag sensor is off and the current from the ACC
or IGN fuse flows same as above–mentioned flowing, causing the airbag squibs to expand. When the safing sensor built into
the center airbag sensor assembly is on, the airbag sensor on one of the above-mentioned circuits is activated so that
current flows to the airbag squibs and causes them to operate.
The airbag stored inside the steering wheel pad is instantaneously expanded to soften the shock to the driver.
The airbag stored inside the passenger’s instrument panel is instantaneously expanded to soften the shock to the
passenger.
1. FRONT PASSENGER AIRBAG MANUAL ON/OFF OPERATION (EXCEPT DOUBLE CAB)
When the passenger airbag manual on/off SW is on, the current flowing from the ACC or IGN fuse to the airbag squib (Front
passenger airbag assembly) is same as above, causing the airbag squib (Front passenger airbag assembly) to expand in an
accident.
If the passenger airbag manual on/off SW is turned to off, the current flows from the ACC fuse to TERMINAL 1 of the
passenger airbag manual on/off indicator to TERMINAL 2 to GROUND, lighting the indicator up. Then the current between
TERMINAL (B) 11 of the airbag sensor assembly and the airbag squib (Front passenger airbag assembly) is cut off, so that it
does not expand the airbag squib (Front passenger airbag assembly) in an accident.
: PARTS LOCATION
Code See Page Code See Page Code See Page
A18 34 C21 B 34 J11 35
A21 34 C22 C 34 P19 35
B6
36 (Double Cab) D7 34 P20 35
B6
37 (Except Double Cab)
F9
30 (5VZ–FE)
P21
36 (Double Cab)
C10 A 34
F9
32 (3RZ–FE, 2RZ–FE)
P21
37 (Except Double Cab)
C12 C 34
F10
30 (5VZ–FE)
P22
36 (Double Cab)
C20 A 34
F10
32 (3RZ–FE, 2RZ–FE)
P22
37 (Except Double Cab)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
1F
1G
23 Cowl Wire and J/B No.1 (Lower Finish Panel)
1M
()
3A
3D
24 Cowl Wire and J/B No.3 (Behind the Instrument Panel Left)
3F
()
3G
26
Cowl Wire and J/B No 3 (Behind the Instrument Panel Center)
3H
26 Cowl Wire and J/B No.3 (Behind the Instrument Panel Center)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IF3 44 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
SYSTEM OUTLINE