03 trailblazer remote start

I am the installer for this particular vehicle for TrackTime Motorsports...  It is a 2003 Trailblazer LS.

The RS is the Scytek Astra 1000 2-Way and we are using the GMDLBP Bypasskit.

I have double and triple checked all the connections and everything seems to be fine.  All connections are soldered and secure.  I am using the tach mode with the tach feed wired tapped into pin 49 on the blue connector on the PCM under hood.  I have relearned the tach signal several times to attempt to rule that out.  Also attempted with and without the "Smart Start" engaged on the RS to no effect.  When it cranks and doesn't start, it goes through the three start attempts and then stops trying to start with the same condition each time - cranks, fires, then immediately dies.  I get none of the built in troubleshooting aids from the RS as far as lights flashing.  Inserting the key during RS operation and attempting to crank results in no cranking so Anti-Grind appears to be wired properly.

As Todd mentioned, as a troubleshooting step, I engaged the remote starter with the FOB, waited for it to attempt to start, which it did and cranked, fired, died...  and then I reached in and put the key in and turned the ignition to run and the next time the RS attempted to start, it started and stayed running.

I wired a relay to engage 12V to the second accessory but the same condition persists.

TIA for any ideas you might have.

Sorry about that, I didn't see yoru reply before I posted my initial reply...

But yes, I am using tach mode but have also tried tachless in all settings and none of them alter the condition.  This is in a heated garage (60* F) so cold start is not an issue.

Everything is wired per the instructions.  The relay pack is wired to both Ignitions (white and pink).  I did not double check 12V at both IGN 1 and 2 during RS operation but will do so.  I do know for certain that the Accessory 1 circuit is getting 12V during RS operation as I verified that before using it to trigger the additional relay for feeding Accessory 2 when I added that.

I am not so sure that it is not a PL issue...  From what I understand about PL, it will allow the engine to crank, fire, but without the proper lock cylinder password transmission on the serial data circuit from the BCM to the PCM, the engine will die quickly.  This sounds exactly like what I am seeing.

Also, I believe the times I have not had a successful starting attempt from the RS are due to attempting to start the engine more than 3 times without the proper PL code and thus triggering the 10 minute wait period built into the PL system.  Starting with the proper PL code (ie, the key) resets/erases the wait period.

Has anybody used this particular Bypass module on a TB with success?

yes... many times

the R-code is generated during crank...  he stated he left the key in the IGN position and it starts fine... to me this would eliminate it being a Passlock issue and point to an IGN wire not being properly powered... as otherwise simply leaving the key in the IGN position would not correct a Passlock issue....

Good to know, thanks.  I will verify 12V on both IGN 1 and IGN 2 and go from there.  I currently do not have the Accessory 2 wired to get 12V during RS operation...  I temporarily installed the additional relay lastnight but removed it when no change occurred.  I will leave that un-wired for now per your instructions.

I also have tried 2 different GMDLBP modules to verify I didn't just have a defective one without any change in the condition.

Question...  I am curious as to what the role in having the serial data circuit not connected to the GMDLBP module until all the other circuits are connected to it is?  There is an "Important" note in the instructions to connect it that way...

Ahhh....  I see.  Makes sense.  I guess I know where to focus then :) .