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GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
9.4.4 Summary. 
Figure 40 contains the graphical representation of the GMLAN Programming Procedure as
defined in the previous sections.
Figure 40: Programming Procedure – Summary
Note: 
The Programming Procedure Summary shows the general steps of the GMLAN programming
procedure. Optional steps are indicated with (Opt).
9.5 ECU Programming Message Flow Example.
The following example assumes:
•
Programming is to be performed on a single node on the SWCAN low speed link.
•
There are four nodes on the SWCAN link.
•
Node 1 (N1) is an SPS_TYPE_A ECU that has a diagnostic USDT response CANId of $641, and a
diagnostic address of $28.
•
Node 2 (N2) is not programmable, has a diagnostic USDT response CANId of $64D, and a diagnostic
address of $60.
•
Node 3 (N3) is an SPS_TYPE_C ECU without operational software or calibration data and a
diagnostic address of $40, (so its SPS_PrimeReq and SPS_PrimeRsp programming request and
response CAN Identifiers are $040 and $340 respectively). Once Node 3 is programmed, its physical
diagnostic request and response CANIds are $247 and $647 respectively.
•
Node 4 (N4) is a Gateway ECU that is not programmable, has a diagnostic USDT response CANId of
$651, and a diagnostic address of $42.
•
Only the low speed subnet (SWCAN link) high voltage wake-up method is shown in the following
examples. The High Voltage wake-up message for the SWCAN low speed link uses CANId $100.
•
Node 3 (N3) is the only node which will be programmed during the programming event.
•
For this example, it is assumed the ECU being programmed supports 4-byte addressing (uses address
$00 $00 $23 $FF) and also is expecting a 4-byte uncompressed memory size with the $34 service.
Utility File Process
Wake-Up Link(s)
Start TesterPresent
Determine GMLAN
Communication
Parameters
Disable Setting
DTCs (Opt.)
Finalize the GMLAN
Communication
Parameters
Retrieve ECU
Identification
Return to Normal
Mode (Opt)
Retrieve SPS Data
out of the SPS
Database
Reconnect the
Tester
Retrieve Seed(s)
Wake-Up Link(s)
Start TesterPresent
Determine GMLAN
Communication
Parameters
Disable Setting
DTCs (Opt.)
Finalize the GMLAN
Communication
Parameter
Verify the Vehicle
(Opt)
Request for
Programming
Enable
Programming
Perform Security
Access
RequestDownload
TransferData
RequestDownload
TransferData
RequestDownload
TransferData
Return To Normal
Mode
Optional Steps
Required to be
Performed After the
SW-Reset
Start
End
RequestInfo Process
Pre-Utility File Process
(Multiple Interpreters Running in Parallel)