There isn't a specific component labeled "shock sensor" you can pinpoint. The information used to detect a crash comes from:
* Accelerometers within the Airbag Control Module (ACM): These are the primary sensors detecting deceleration forces. The ACM is typically located under the dashboard, often on the driver's side.
* Other sensors: The ACM might also receive inputs from other sensors (seatbelt pretensioners, etc.) to aid in its crash determination.
If you're trying to troubleshoot an airbag system issue, you should not attempt to locate and manipulate any components yourself. Airbag systems are complex and dangerous. Take it to a qualified mechanic or dealership for diagnosis and repair.