07 trailblazer security problem?

I have a customer that is complaining that in cold weather the vehicle takes 3 times to start.  They state that it starts then shuts down and restarts.  I have had them watch it and thye say that the security light flashes when it shuts down.  I installed a GMDLBP.  I have had the vehicle in many times and it has never done it to me.  Can the bypass be effected by cold?  How does it actually work?  Does it send a security  "ok" message or does it send a resistance value message?  Does anyone have any ideas.  I have read some post that state that the voltage sensing does not work on the newer trailblazers in the cold.  Right now it is setup as voltage sensing and I have thought about switching it to a tach signal but I cannot even find an injector on this vehicle and since the customer states that the security light flashed makes me think that it is a security problem.

what remote start did you put in this?

I put in a commando EZ-2500. I have had very good luck with this brand.

the tach is located at the pcm on the driver side of engine compartment, pin 49 which is blue. Not sure if switching to tach would fix the problem, though, as I have no experience with that brand, but it is worth a shot.

No reason to chase down injectors or even run wires under the hood. The search feature should probably find it for you, but the tach wire is inside the car just inches from your ignition wires.

Your bypass should barely be affected by cold since it is a data module. Make sure your data wire is soldered for best connection. Otherwise I believe it is a tach issue.

needs a tach hooked up, on trailblazers for some reason the alternator is inactive for the first couple seconds when started then it kicks in screwing up voltage sensing causing start/stop. restart issue, injector wires can be gotten at by removing airintake box off top of motor with 2 10mm bolts on pass side of box, and loosen 2 8mm bolts to air tubes and just grab an uncommon injector wire, program unit for tach and program tach and problem should be cured

The answer is obious my man. Tach. On the last few trailblazers i did i recall going to the cluster. Not sure on what year it was but i used the xk01 bypass.A DMM is a beautiful thing.

MECP Advanced Installer Certified.