Toyota Tundra 2005 Service - Repair - Maintenance page 4130

System Outline
The SRS is a driver protection device which has a supplemental role to the seat belts.
When the ignition SW on, the current from the IGN1 fuse flows to TERMINAL (A) 21 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 IGN1 fuse flows to TERMINAL (A) 21 of the center airbag sensor assembly.
This current flows to TERMINALS (A) 4, (A) 5, (B) 4, (B) 5, (C) 4, (C) 5 to TERMINAL 1 of the airbag squib and Pretensioners
to TERMINAL 2 to TERMINALS (A) 3, (A) 6, (B) 3, (B) 6, (C) 3, (C) 6 of the center airbag sensor assembly. Furthermore, the
current flows to TERMINAL (A) 25 or (A) 26 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 IGN1
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.
: Parts Location
Code See Page
A11 64
A12 64
A16 66
A17 66
B13 72
B14 70
B15 70
C4 A 66
C5 B 66
C6 C 66
C11 A 66
C12 B 66
C21 66
C22 70
: Junction Block and Wire Harness Connector
Code See Page
1A
1C
1D
1E 45
1F
1G
1H
1J 45
2C
41 41
2D
3A
3B
3C 48
3D
3E
4A 50
Code
C23
D6
E4
F13
I23
I25
J45
J54
J58
O10 A
O11 B
O12
O13
O14
Junction Block and Wire Harness (Connector Location)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
Engine Room Main Wire and Engine Room J/B (Engine Compartment Left) Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
Cowl Wire and Sub J/B No.3 (Upper the Accelerator Pedal)
Cowl Wire and Sub J/B No.4 (Upper the Accelerator Pedal)
2005 TOYOTA TUNDRA (EWD611U)
See Page
70
67
67
34, 64
67
67
68
68
68
72
72
72
72
72
( )
( )
Code See Page
O15 72
P13 71
P14 71
S13 A 69
S14 B 69
S32 71
S33 71
S34 71
S35 71
71 (Separate Seat)
S37 S37
72 (Captain Seat)
71 (Separate Seat)
S38 S38
72 (Captain Seat)
473