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

Table C34: Definition of End Mode lPart Number Alpha Code dataIdentifier 
DID Description 
R/W 
Data Type 
Len 
$DB 
EndModelPartNumberAlphaCode 
R/W
10
ASCII 
2 
This DID contains the 2-character representation of the Alpha Code (or Design Level suffix) associated 
with the EndModelPartNumber (stored in dataIdentifier $CB). 
W
10
 
=
 
This DID may or may not be updated at the conclusion of a programming event based on 
divisional practices. This DID is not required to be writeable if divisional practices do not require 
this part number to be updated after module programming. 
Position 
1 
2 --- 
EndModelPartNumberAlphaCode 
RS 
--- 
Hex value 
52 53 --- 
Table C35: Definition of Base Model Part Number Alpha Code dataIdentifier 
DID Description 
R/W 
Data Type 
Len 
$DC 
BaseModelPartNumberAlphaCode 
R 
ASCII 
2 
This DID contains the 2-character representation of the Alpha Code (or Design Level suffix) associated 
with the BaseModelPartNumber (stored in dataIdentifier $CC). 
Position 
1 
2 --- 
BaseModelPartNumberAlphaCode 
RS 
--- 
Hex value 
52 53 --- 
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 313 of 336 
Table C36: Definition of Software Module Identifier dataIdentifiers 
DID Description 
R/W 
Data Type 
Len 
$DD 
SoftwareModuleIdentifierDataIdentifiers (SWMIDID) 
R 
USN 
2 to 40 
If an ECU supports more than ten software/calibration modules, then this DID shall be used to retrieve 
the list of additional DIDs (in the application specific range) that the tester must retrieve in order to 
determine the SWMI and SWMIAC for the 11
th
through the n
th
software/calibration module(s). 
The DID numbers for the additional modules shall be transmitted in pairs with the DID number for the 
SWMI transmitted first followed by the DID number for the SWMIAC. 
The definition and the content (data type, length, format) of the data reported when a tester requests 
one of the DIDs provided in this list can be found in the definition of the corporate common Data 
Identifiers $C1thru CA (SWMIs of the first ten modules). 
If an Alpha Code (or Design Level Suffix) is not supported, then the position byte for the alpha code 
shall contain a value of $00. 
There are a maximum of twenty (20) additional software/calibration modules possible (30 total modules 
for an ECU including those provided with DIDs $C1 thru $CA). The relationship between the additional 
SWMI/SWMIAC and the application specific DID number is as follows: 

Position #1: SoftwareModule_11_DID 

Position #2: SoftwareModule_11_AlphaCode_DID 

Position #3: SoftwareModule_12_DID 

Position #4: SoftwareModule_12_AlphaCode_DID 

Position #5: SoftwareModule_13_DID 

Position #6: SoftwareModule_13_AlphaCode_DID 

Position #7: SoftwareModule_14_DID 

Position #8: SoftwareModule_14_AlphaCode_DID 

Position #9: SoftwareModule_15_DID 

Position #10: 
SoftwareModule_15_AlphaCode_DID