To be certain, the best approach is to:
* Consult your owner's manual: This is the most reliable source of information.
* Visually inspect the area under the driver's side dash: Look for a relatively large rectangular box or unit with wiring harnesses connected.
* Check behind the radio: Sometimes, the amp is mounted behind or near the head unit.
If you can't locate it, a qualified car audio professional should be able to help.