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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
5
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.
Bytes 4 and 5 (Engine RPO)
These two bytes contain the ASCII representation of the last two characters of the engine Regular
Production Option (RPO). The first character of an engine RPO is constant and is therefore not stored.
For the L67 engine, the value for these two bytes would be “6” = $36, and “7” = $37. If the module is to
be used with multiple engines, then a $23 (ASCII “#”) is put in both bytes. If the module can be used
with any engine type, then $2A (ASCII “*”) is put in both bytes.

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