2006 Chevrolet Equinox won't start, security system is engaged, how do we restart it?

This sounds like the fuel pressure regulator is leaking fuel into the engine when it sits, it will start as if it were flooded if you try to restart within 20 minutes and it will crank longer when cold because the fuel system needs to prime up. I hope this helps. Take care.

This may be related to the antitheft system The system is known for turning off the starter and/or injectors when it fails. Is there a light on the dash that says SECURITY? This is a common problem worth looking into. http://www.diy-gm-security.com/

Check you transmission fluid, if it is low, it will not engage the other gears

The security light is telling you that something is failing or has already failed in the antitheft system. Eventually this will keep your vehicle from running or starting. This link explains how the system works and ways to beat it

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Once speed is over 35mph,

Make sure the switch on the turn signal switch is moved to on, then press the button in the end of the turn signal switch to engage the set speed

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Looking at a wiring diagram to see what all is involved in the starter circuit's an testing with a DMM - digital multi-meter is how you go about diagnosing this . Free wiring diagram's here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size . Under system click on engine ,then under subsystem click on starting . Click the search button then the blue like. Looking at the diagram i see a starter relay ,ignition switch , PCM - engine computer ,the starter . The starter should have only two wire's , heavy gage red - this is B+ voltage for the starter . A smaller gage purple wire - this is the control wire . Do you know how a relay work's ? video's on youtube showing how . If the computer see's an input from the park neutral safety switch on no anti-theft system problems it will supply a ground for the starter relay , sending B+ voltage to the starter solenoid engaging the starter an spinning the engine over .

provide ur dealer with VIN of ur equinox. he can help u out after that.

I have repolaced a couple switches on these does yours show power when you cut on but will not engage ? if so probably the set/resume switch on steering wheel

Does not sound normal. A bad solenoid in the starter is most likely the prob. If it makes a grinding sound, that is the starter crank shredding the teeth on the fly wheel. It will ruin the starter, and tear up the fly wheel a bit.

Did you unlock doors and pull handles like to open, then try?