VATS and Passlock - UART and Serial 2 DATA - L36 to L67 Powertrain swap

[User Nameless]

I am no stranger to these GM anti-theft features, but there is an unknown presenting itself on my current project. I have a 2000 Impala LS (3800na) that is getting the engine, transmission, and PCM from a 2000 Buick Regal GS (3800sc). I need to know if the VATS/Passlock relearn procedure will work between the Impala BCM and the Regal PCM. The pinout for the Impala shows the BLUE (C1) plug PIN-15 (TAN) as circuit 800 -- UART Serial Data (unused pin on Regal PCM). The pinout for the Regal shows the BLUE (C1) plug PIN-58 (PURPLE) as circuit 1807 -- CLASS 2 Serial Data.

The differences noted:

2000 Impala LS PCM:
Service Number: 09361735 (CYMZ)
Hardware Number: 09357440 (CYMZ)

Impala PCM BLUE plug PIN-15 (TAN) - UART Data
Impala PCM BLUE plug PIN-58 (BLANK)
Impala PCM BLUE plug PIN-59 (GREEN WIRE) - INFO needed
----
2000 Regal GS PCM:
Service Number: 09380717 (CZZC)
Hardware Number: 09357440 (CZZC)

Regal PCM BLUE plug PIN-15 (BLANK)
Regal PCM BLUE plug PIN-58 (PURPLE) - Serial 2 Data
Regal PCM BLUE plug PIN-59 (BLANK)

I have pinouts from a few different year and model PCM to compare. PIN-58 and PIN-59 show both to be Serial 2 Data on one diagram.
I do not have the exact pinout for either of these 2 cars, but the details of my self-made diagram shows to be accurate and consistent with other PCM units from neighboring vehicles.

What I would like to know is more detail about the VATS relearn procedure between BCM and PCM.
Will this work?
Is a VATS bypass needed? If so, can it be accomplished with a bypass module from an aftermarket vendor?
Is a reflash of the PCM needed?
Will the Impala BCM communicate UART password to the unused pin on the Regal PCM?

Anyone know the answers? Thanks in advance!

[kur4o]

Most like it will work

Both systtems use class 2 serial data for fuel enable.

The vin number on bcm and pcm should match.
So you need to change that on the new pcm.

[User Nameless]

Yes, I am aware of the VIN issue. A plan to flash that and any other needed changes to the new PCM is in the works.
What about the dark blue wire on the BLUE plug C1 Pin-70 labeled Theft Deterrent Fuel Enable? Omit this wire and function with the new PCM installation?

[kur4o]

Looks like c1-70 wire is for analog PWM fuel enable signal.
You can discard it.
In the service manual it says Class 2 signal for both cars.

If you program the Pcm, why not just disable the vats.
The bcm for this cars is very problematic.

[User Nameless]

My intentions are to remove the VATS when I get the PCM flashed with the VIN. Unfortunately, I am past my budget at this time and this project is taking place now, where I have the resources and facilities to do it. Then.. I will need to drive back home, a few states away. Another detail I need to investigate is the Impala being a California Emissions car with the auxiliary AIR Pump and related components.

IF... This equipment remained pinned to the new PCM, will it function? Does the mainboard of the PCM have the ability to operate this equipment pre-manufactured at the hardware level? If so, are they P&P functional or would this need to be addressed with the PCM flash?

I am very grateful for your replies on this topic BTW... There are many small details that must be thoroughly investigated as I do not wish to fight the battle of tending to any issues that could have been taken care of easier and faster with the car in its current dismantled state.

[User Nameless]

My intentions are to remove the VATS when I get the PCM flashed with the VIN. Unfortunately, I am past my budget at this time and this project is taking place now, where I have the resources and facilities to do it. Then.. I will need to drive back home, a few states away.

I should have mentioned my goal here. Is it possible to start and drive the car as I intend to get the new PCM flashed in the vehicle at a later date, or send it in if needed. With the Passlock question out of the way, the emissions and other necessary wiring and component changes are being checked and double checked before I leave town. As of now, my request for programming include VIN, disable VATS - Passlock, and possibly enable auxiliary emissions functionality so the job can be done proper. I am not intending to go with extra high performance equipment, but a modular pulley system and a CAI are to be considered in the future. Until then, the goal is to keep the OEM design intact and fully functional.

[User Nameless]

Looks like c1-70 wire is for analog PWM fuel enable signal.
You can discard it.
In the service manual it says Class 2 signal for both cars.

If you program the Pcm, why not just disable the vats.
The bcm for this cars is very problematic.

Do you have the specific PCM pinouts for both models?

[kur4o]

There is a Software switch in the PCM which system to use Class2 or Analog PWM.
From the factory it is set at class 2.
If you change it to use PWM, and put a wire at c1-70 with appropriate analog signal it will work.

Best approach will be completely disable vats.

I am trying to find out whats the best settings to do that.
Do you know the regal vin number to check the os id.
It should be written on the PCM label also.
Just write down all the info from the label.
California emission system shouldn`t bother you.


Here is the pinout