Toyota Tundra. Manual — part 2556

b. All connectors in the SRS, except the seat position airbag sensor connector, are colored yellow to

distinguish them from other connectors. These connectors have special functions, and are specially
designed for the SRS. All SRS connectors use durable gold-plated terminals, and are placed in the
locations shown below to ensure high reliability.

1. Terminal twin-lock mechanism:

All connectors with a terminal twin-lock mechanism have a two-piece component consisting
of a housing and a spacer. This design enables the terminal to be locked securely by two
locking devices (the retainer and the lance) to prevent terminals from coming out.

Fig. 4: Identifying Connector Housing & Spacer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2. Activation prevention mechanism:

All connectors with an activation prevention mechanism contain a short spring plate. When
these connectors are disconnected, the short spring plate creates a short circuit by
automatically connecting the positive (+) and negative (-) terminals of the squib.

(2)

Activation

Prevention

Mechanism

Connectors 2, 4, 24,
26, 36

(3)

Half Connection

Prevention

Mechanism

Connectors 21, 23,
25, 35

(4)

Connector Position

Assurance

Mechanism

Connectors 8, 37,
39,

(5)

Connector Lock

Mechanism (1)

Connectors 9, 11,
27, 33

(6)

Connector Lock

Mechanism (2)

Connectors 2, 4

(7)

Improper

Connection

Prevention Lock

Mechanism

Connectors 1, 3

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Fig. 5: Identifying Activation Prevention Mechanism
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

3. Half connection prevention mechanism:

If the connector is not completely connected, the connector is disconnected due to the spring
force so that no continuity exists.

Fig. 6: Identifying Half Connection Prevention Mechanism
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

4. Connector position assurance mechanism:

Only when the housing lock (white part) is completely engaged, the CPA (yellow part)
slides, which completes the connector engagement.

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Fig. 7: Identifying Connector Position Assurance Mechanism
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

5. Connector lock mechanism (1):

Locking the connector lock button connects the connector securely.

Fig. 8: Identifying Connector Lock Mechanism (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

6. Connector lock mechanism (2):

Both the primary lock with holder lances and the secondary lock with retainer prevent the
connectors from becoming disconnected.

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Fig. 9: Identifying Connector Lock Mechanism (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

7. Improper connection prevention lock mechanism:

When connecting the holder, the lever is pushed into the lock position by rotating around the
A axis to lock the holder securely.

Fig. 10: Identifying Improper Connection Prevention Lock Mechanism
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

4. DISCONNECTION OF CONNECTORS FOR STEERING PAD, FRONT PASSENGER AIRBAG

(SQUIB SIDE), CURTAIN SHIELD AIRBAG, FRONT SEAT SIDE AIRBAG AND FRONT
SEAT OUTER BELT

HINT:

Tape the screwdriver tip before use.

a. Release the lock button (yellow part) of the connector using a screwdriver.

b. Insert the screwdriver tip between the connector and the base, and then raise the connector.

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra