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


GM WORLDWIDE ENGINEERING STANDARDS



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gmw3110

GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 303 of 336 
Table C17: Definition of Manufacturing Traceability Characters dataIdentifier 
DID 
Description 
R/W 
Data Type 
Len 
$B4 
Manufacturing Traceability Characters (MTC) 

ASCII 
16 
This DID contains the data necessary to meet the component traceability requirements as specified in 
GMW4710 and GMW15862. The length of this DID is variable but shall not exceed 16 characters. These 
fields are populated at the time of component manufacturing by the manufacturer. The ECU specific CTS 
or supplemental diagnostic specification referenced by the CTS or SSTS must document how the fields 
are to be populated. 
Legacy Format (To be phased out per GMW15862) 
A description of each field follows: 
Component Identifier (Comp Id)
The component Identifier is a 2 byte field (starting at byte 1 of the DID) that is used to indicate the 
component type. 
Part Number / Broadcast Code (PN/BC)
This is a 4-byte field (starting at byte 3 of the DID) and contains either the ECU Broadcast Code or the 
last 4 digits of the ECU part number. 
Supplier Code (sup) 
This is a one byte field occupying the 7
th
byte of the DID that identifies the supplier and manufacturing 
location of the ECU.
Traceability Number
This field starts at byte 8 of the DID and is 9 bytes in length. The content is assigned by the module 
manufacturer. This field contains information about the ECU at the time of its manufacture. Examples of 
the type of data included in this field are Julian Date of production, shift build data, production assembly 
line information and ECU serial number. If less than 9 characters are required to uniquely identify an 
ECU, then the leading characters shall be filled with zeroes (0x30). 
Position 









10 
11 
12 13 14 15 16 
--- 
MTC 
















--- 
Hex value 
41 
53 
37 
30 
38 
31 
4B 
31 
35 
30 
36 
31 30 30 30 46 
--- 
Field Desc. 
Comp Id 
PN/BC 
sup 
Traceability Number 
--- 

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