E37 anti theft disable

[MisterBill]

So we are trying to get a 2007 HHR to run on a 2010 ECM/TCM combo (yes we have a good reason for doing this)...and I have taken care of the wiring differences between the two, but we're not sure if the anti-theft is being disabled. It seems that the EFILive software says that a full re-flash must be performed (for a OS "patch"?), yet the software doesn't seem to allow us to do this...only the engine calibration data. We have checked the appropriate "disable VATS" boxes and re-programmed the 2010 ECM...the security lamp goes off but the starter will still not turn over. (and yes I am aware that both the starter relay and P/N switch signals are on different pins and changed polarity in 2008, this has been accounted for).

Is it a true statement that if that security light is out then VATS is unquestionably not causing a no crank/no start condition? Would there be anything else to account for other than VATS and the wiring differences introduced in 2008?

Thanks...we're pretty new with the EFILive software and still learning!

Bill

[ScarabEpic22]

Close everything down, then plug your V2 into the car and laptop. Once it is on the normal screen, go ahead and open the tune file in V7.5. The big red arrow for full flashing (far right arrow) should be available now.

If you want to use V8 (not sure if you can full flash E37s in V7.5...), open the tune file in V7.5 and save it as a .ctd file. Then open V8 S&T, click F3 Tune. Click open at the bottom, open the tune file. Then click F9 Full Flash.

[gmh308]

So we are trying to get a 2007 HHR to run on a 2010 ECM/TCM combo (yes we have a good reason for doing this)...and I have taken care of the wiring differences between the two, but we're not sure if the anti-theft is being disabled. It seems that the EFILive software says that a full re-flash must be performed (for a OS "patch"?), yet the software doesn't seem to allow us to do this...only the engine calibration data. We have checked the appropriate "disable VATS" boxes and re-programmed the 2010 ECM...the security lamp goes off but the starter will still not turn over. (and yes I am aware that both the starter relay and P/N switch signals are on different pins and changed polarity in 2008, this has been accounted for).

Is it a true statement that if that security light is out then VATS is unquestionably not causing a no crank/no start condition? Would there be anything else to account for other than VATS and the wiring differences introduced in 2008?

Thanks...we're pretty new with the EFILive software and still learning!

Bill

The VATS patch is not intended to get your starter circuit to work. You will need to direct wire the starter motor. The crank command comes into the ECM via the CAN.

[samgm2]

Which module sends the crank command into the ECM?

[MisterBill]

Close everything down, then plug your V2 into the car and laptop. Once it is on the normal screen, go ahead and open the tune file in V7.5. The big red arrow for full flashing (far right arrow) should be available now.

If you want to use V8 (not sure if you can full flash E37s in V7.5...), open the tune file in V7.5 and save it as a .ctd file. Then open V8 S&T, click F3 Tune. Click open at the bottom, open the tune file. Then click F9 Full Flash.

Thanks we will try that.

[MisterBill]

The VATS patch is not intended to get your starter circuit to work. You will need to direct wire the starter motor. The crank command comes into the ECM via the CAN.

So what is the intention of the VATS patch then?

Bill

[GMPX]

Since about 2006 GM's production ECM's can't have the theft disabled via the calibrations, theft is always activated. The OS 'patch' cures this restriction by altering the theft processing in the ECM so it allows the engine to run even if the rest of the theft system on the vehicle is not fitted (eg hotrod conversion).

[gmh308]

Which module sends the crank command into the ECM?

Body Control Module normally. After it decides the vehicle is not being stolen via authentication of secret keys etc etc.

So what is the intention of the VATS patch then?

Bill

^^^ As GMPX says . If VATS wasnt patched by the EFILive wizardry, then when the engine started cranking the ECM wouldnt turn the ignition coils on for spark and start firing injectors so no run. With the patch, when the crank and cam sensors see the engine turning over the ECM allows the engine to start and run.

[MisterBill]

lol there is no wizardry here...this is not magic just hardware and software.

Ok so you all are saying that the anti-theft system does not disable cranking, only running (fuel, spark...etc)?

Since there are "disable VATS" options in 7.5...and that requires an OS patch...I would assume then that setting these "disable VATS" options and re-flashing will apply the appropriate OS patching?

I still want go to back to the security light question...if that is off does that mean that the anti-theft system is without a doubt out of the picture? (either by disabling or providing the system what it wants).

In our setup, the light goes off with the "VATS Disable" option(s) checked, and Sam found a "Starter Relay Diagnostics" disable or something to that effect, and we can get the vehicle to crank over, but it still will not start.

Bill

[gmh308]

lol there is no wizardry here...this is not magic just hardware and software.

Ok so you all are saying that the anti-theft system does not disable cranking, only running (fuel, spark...etc)?

Since there are "disable VATS" options in 7.5...and that requires an OS patch...I would assume then that setting these "disable VATS" options and re-flashing will apply the appropriate OS patching?

I still want go to back to the security light question...if that is off does that mean that the anti-theft system is without a doubt out of the picture? (either by disabling or providing the system what it wants).

In our setup, the light goes off with the "VATS Disable" option(s) checked, and Sam found a "Starter Relay Diagnostics" disable or something to that effect, and we can get the vehicle to crank over, but it still will not start.

Bill

ROFL just hardware and software and the answers come in Cornflake packets too. And any shadetree mechanic can disable anti theft. ROFL.

Anti theft is a distributed function. Its about the right key in the right ignition lock with the right BCM, right instrument cluster, right ECM, right anti theft module etc etc etc. Anti theft does control cranking, but it does not do it in any one module.

The purpose of the VATS patch in ECM is to enable the ECM to run an engine in a conversion without all the other anti theft bollox that comes with a regular production car. Set VATS patch to applied, save, full flash. VATS patched. Why do you want to patch VATS out?

In some calibrations GM tests for presence of the starter relay. If it is missing then no start. i.e. crank but no start. Normally disabling the starter relay check and or setting relay type to none will work. Or use a resistor to ground the starter relay pin on the ECM.

What security light?