SRS Connectors

SRS CONNECTORS







a. All connectors in the SRS are yellow (to distinguish them from other connectors). Some connectors have special functions and are specially designed for the SRS. These connectors use durable gold-plated terminals, and are located as shown above to ensure high reliability.
1. Terminal twin-lock mechanism:
Each connector has a two-piece component consisting of a housing and spacer. This design enables the terminal to be locked securely by 2 locking devices (the retainer and lance) to prevent terminals from becoming unseated.




2. Activation prevention mechanism:
Each connector contains a short spring plate. When the connector is disconnected, the short spring plate automatically connects the positive (+) terminal and negative (-) terminal of the squib.







3. Electrical connection check mechanism: This mechanism electrically checks that the connectors are connected correctly and completely. The electrical connection check mechanism is designed so that the disconnection detection pin connects with the diagnosis terminals when the connector housing lock is locked.




4. Half connection prevention mechanism:
If the connector is not completely connected, the connector is disconnected by the spring.




5. Connector lock mechanism: Locking the connector lock button connects the connector securely.




6. Connector position assurance mechanism: Only when the housing lock (white part) is completely engaged, the CPA (yellow part) slides, which completes the connector engagement.




b. When the vehicle is involved in a frontal collision in the hatched area (Fig. 1) and the shock is larger than the predetermined level, the SRS is activated automatically. The safing sensor is designed to go on at a smaller deceleration rate than the airbag sensor. As illustrated in Fig. 2, ignition is caused when current flows to the squib, which happens when the safing sensor and the deceleration sensor go on simultaneously. When a deceleration force acts on the sensors, 2 squibs in the driver airbag and front passenger airbag ignite and generate gas. The gas discharging into the driver airbag and front passenger airbag rapidly increases the pressure inside the bags, breaking the steering pad and instrument panel. The deployment of the bags then ends, and the bags deflate as the gas is discharged through discharge holes at the bag's rear or side.

DEPLOYMENT CONDITION




a. When the vehicle is in a collision and the shock is greater than the specified value, the SRS is activated automatically. The safing sensor and deceleration sensor are built into the center airbag sensor. The safing sensor is designed to be turned on at a smaller deceleration rate than the deceleration sensor. The deceleration sensor determines whether or not SRS deployment is necessary based on signals from the front airbag sensor. Current flows to the squibs to deploy the SRS when the conditions shown in the illustration below are met.

DISCONNECTION OF STEERING PAD
a. Release the lock button (yellow part) of the connector using a screwdriver (Fig. 1).




b. Insert the screwdriver tip between the connector and base, and then raise the connector (Fig. 2).


CONNECTION OF STEERING PAD
a. Connect the connector.




b. Push the lock button in to connect the holder (with connectors). Check that it locks and that a "click" sound is heard.

DISCONNECTION OF CONNECTOR FOR FRONT AIRBAG SENSOR

a. Push down the housing lock (white part) and slide the CPA (yellow part) (at this time, the connector cannot be disconnected yet.)




b. Push down the housing lock (white part) again and disconnect the connector.

HINT: Do not push down the A part shown in the illustration when disconnecting.




c. After disconnecting the connector, check that the position of the housing lock (the white part) is as shown in the illustration.

CONNECTION OF CONNECTOR FOR FRONT AIRBAG SENSOR




a. Before connecting the connectors, check that the position of the housing lock (the white part) is as shown in the illustration.




b. Be sure to engage the connectors until they are locked (when locking, make sure that a click sound can be heard).