Heat Method
WARNING: This page is about a different car, the 1994 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
DO NOT heat any component to temperature greater than 140°F (60°C). DO NOT apply heat directly to any part of the Electronic Control Module (ECM).
Using hair dryer or similar device, apply heat to the component. Monitor suspected circuit or component while applying heat.