General Specification Electrical Function gmw3110 General Motors Local Area Network Enhanced Diagnostic Test Mode Specification

9.3.5 ECU Supplier Requirements. 
Boot software shall be programmed by the ECU supplier. 
If the ECU supports the SecurityAccess ($27) service for SPS programming then the supplier shall program a 
random seed and the corresponding key value assigned by GM Service and Parts Operations into the ECU 
during the ECU manufacturing process. 
The utility file necessary for SPS programming shall be developed by the ECU supplier. 
The CTS shall specify if operational software and/or calibrations are to be programmed by the supplier. 
9.3.6 Assembly Plant Requirements. 
The cumulative time to program all ECUs in the vehicle assembly 
process shall be less than the maximum time specified in the General Assembly Programming And Test 
section of the GM Bill Of Process (BOP). 
The ECU received at the vehicle assembly plant must be externally identifiable prior to installation into the 
vehicle. 
All ECUs that implement the SecurityAccess service for SPS programming shall be shipped to the vehicle 
assembly plant with the security mechanism unlocked (via the use of the MEC). Refer to paragraph 9.3.2.6 for 
specifics. 
Note:
The MEC is not required to be supported in the boot software if the ECU is always unlocked when 
operating out of the boot software. Even though the boot software may not evaluate the value of the MEC, the 
memory address where the MEC is located shall be initialized as documented in paragraph 9.3.2.6.2. 
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 271 of 336 
9.4 ECU Programming Process. 
The overall programming procedure is comprised of the following 
sub-processes: 
a. Read Identification Information. This is a single path consisting of all the steps required to retrieve the 
necessary ECU identification data for a proper selection of the data in the SPS database. This step is 
required for service, not necessarily for assembly plant programming. 
b. Retrieve SPS data. This is a single path consisting of all steps required to retrieve the proper SPS data out 
of the SPS database. The selection is based on information read during step a. (service) or known in 
advance (assembly plant). 
c. Programming Session. 
1.