Toyota Camry won't start after replacing thermostat and coil pack

Try deactivating antitheft

Turns out there isn't a security system. No keyless system either. Once you put the key in to try and start it the horn just starts blowing but car won't crank.

Turn key to on, press stereo power, push and hold tuning up and station 1 buttons simultaneously until --- shows up. Enter unlock code by using preset buttons and arrows (can find this by pressing and holding presets 1 and 6 before turning on stereo....will flash 2 2 digit codes) after putting in the code the radio will power off. Turn it back on and then try starting the engine

Might be wired into the stereo, I sent instructions but it says will post shortly, check email