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


Table C18: Definition of Broadcast Code dataIdentifier



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Table C18: Definition of Broadcast Code dataIdentifier 
DID Description 
R/W 
Data Type 
Len 
$B5 
GM BroadcastCode (GMBC) 
R/W 
ASCII 

This DID contains four alpha characters which represent the ECU broadcast code. The broadcast code is 
unique for each combination of hardware, software, and calibrations for an ECU. 
Position 




… 
Broadcast Code 




… 
Hex value 
41 
42 
43 
44 
… 
Table C19: Definition of GM Target Vehicle Data dataIdentifier 
DID Description 
R/W 
Data Type 
Len 
$B6 
GM Target Vehicle (GMTV) 
R/W
5
USN/ASCII 

This DID contains five bytes of data used to identify the vehicle that the ECU is targeted for. The data is 
broken down as follows: 
Byte 1 (Model Year)
This byte is an USN value that represents the target model year using the year 1900 as the base year. 
To represent the 2000 model year, the value of byte 1 would be 100 or ($64). This is derived from 1900 
+ 100 = 2000. If the module supports multiple model years, then this byte is filled in with $23 (ASCII 
equivalent to 
“#”). 
Byte 2 (Vehicle Make)
This byte is the ASCII representation of the Vehicle Make as Identified in the Vehicle Identification 
Number (VIN). For example, Cadillac = 6 or $36. If the part is used in multiple vehicle makes, then a 
value of $23 (ASCII 
“#”) is used. 
Byte 3 (Vehicle Car Line)
This byte is an ASCII character representing the vehicle car line (e.g., 
J
for Chevy Cavalier). If the 
module can be used in multiple car lines, then a value of $23 (ASCII 
“#”) is used. 

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