Fit Verification Mechanism

FIT VERIFICATION MECHANISM:
The mechanism is used to electrically check the engagement of the connector between the SRS-ECU and body wiring harness. The operating principle is described below.
(1) Securely connect the SRS-ECU and harness side connectors and press the secondary lock lever down to lock the connectors.
(2) At this time, the short bar provided on the rear surface of the secondary lock lever produces a short circuit across terminals No. (7) and (8) of the SRS-ECU. The SRS-ECU supplies monitoring current to the circuit to electrically verify that the connectors have been locked.

CONNECTOR SHORTING MECHANISM:
The mechanism is designed for prevention of accidental ignition of the inflator when the clock spring connector (for the squib circuit) is removed from the SRS-ECU. The operating principle is described below.





When Connectors Are Fitted:
When the SRS-ECU and clock spring connector are coupled, the circuit between the short terminals and clock spring connector terminals is kept in the OFF state by the partition plate provided in the connector of the SRS-ECU.





When Connectors Are Disconnected:
When the clock spring connectors are disconnected from the SRS-ECU, the partition plate between the short terminals and clock spring connector terminals is removed. As a result, a short circuit is formed between the two poles of the clock spring connector terminals to prevent generation of a potential difference (current) between the squib terminals.