Toyota Tundra 2005 Service - Repair - Maintenance page 3896

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 IGN 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 IGN fuse flows to TERMINAL (A) 21 of the center airbag sensor assembly.
This current flows to TERMINALS (A) 4, (A) 5, (B) 2, (C) 4 to TERMINAL 1 of the airbag squib (Steering wheel pad) and
pretensioners to TERMINAL 2 to TERMINALS (A) 3, (A) 6, (B) 1, (C) 5 of the center airbag sensor assembly 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 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.
Front Passenger Airbag On/Off Operation
When the passenger airbag manual On-Off SW is on, the current flowing from the 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.
: Parts Location
Code See Page
52 (2UZ-FE)
A11 A11
54 (1GR-FE)
52 (2UZ-FE)
A12 A12
54 (1GR-FE)
A16 56
A17 56
A36 56
B13 62 (*7)
60 (*3)
B14 B14
61 (*4)
60 (*3)
61 (*4)
B15
63 (*8)
B16 63 (*8)
: Relay Blocks
Code See Page
2 23
: Junction Block and Wire Harness Connector
Code See Page
24 (*2)
1F 1F
28 (*1)
24 (*2)
1G 1G
28 (*1)
24 (*2)
1M 1M
28 (*1)
* 1 : w/ Daytime Running Light
* 6 : Captain Seat * 7 : Access Cab Captain Seat
Code
C4 A
C5 B
C6 C
C11 A
C12 B
D6
E4
I24 A
I25 B
J5
J8
J12
J13
J66 A
Relay Blocks (Relay Block Location)
Engine Room R/B (Engine Compartment Left)
Junction Block and Wire Harness (Connector Location)
Cowl Wire and Driver Side J/B (Lower Finish Panel) Cowl Wire and Driver Side J/B (Lower Finish Panel)
* 2 : w/o Daytime Running Light
* 8 : Standard Cab Bench Seat
2005 TOYOTA TUNDRA (EWD611U)
See Page
56
56
56
56
56
57
57
57
57
58
58
58
58
58
* 3 : Access Cab * 4 : Standard Cab
* 9 : Access Cab w/o Power Seat
Code See Page
J67 B 58
O10 A 62 (*7)
O11 B 62 (*7)
O12 62 (*7)
O13 62 (*7)
O14 62 (*7)
O15 62 (*7)
O16 63 (*8)
60 (*3)
P13 P13
61 (*4)
60 (*3)
P14 P14
61 (*4)
S36 63 (*8)
* 5 : Bench Seat
239