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

Note: 
If Encryption or Compression techniques are utilized, then multiple requests for this service (one per 
module downloaded) 
may
be required as determined by the encryption or compression techniques for each 
module. Ideally, all software or calibration modules downloaded to a single node should use a single 
encryption and/or compression technique. 
8.12.2 Request Message Definition (Table 132). 
Table 132: RequestDownload Request Message 
Data Byte Parameter Name 
Cvt 
Hex Value Mnemonic 
#1 
RequestDownload Request Service Id 
M 
34 
SIDRQ 
#2 
dataFormatIdentifier 
M 
xx 
DFI_ 
#3
Note 1
#4 
#5 
#6 
unCompressedMemorySize = [ 
Byte1 - MSB 
Byte2 
Byte3 
Byte4 ] 
M 
M 
C1 
C2 
xx 
xx 
xx 
xx 
UCMS_B1 
UCMS_B2 
UCMS_B3 
UCMS_B4 
Where: 
C1:
Byte 3 is present when the unCompressedMemorySize parameter contains 3 or 4 bytes. 
C2:
Byte 4 is present when the unCompressedMemorySize parameter contains 4 bytes. 
Note 1:
Byte1 in the unCompressedMemorySize parameter is always the most significant byte and the last byte of the 
unCompressedMemorySize parameter (Byte2 for 2-byte length, Byte3 for 3-byte length, or Byte4 for 4-byte length) is always the least 
significant byte of the unCompressedMemorySize parameter. 
8.12.2.1 Request Message Sub-Function $Level Parameter Definition. 
There are no sub-function 
parameters used by this service. 
8.12.2.2 Request Message Data Parameter Definition. 
Table 133
 
contains the data parameter values 
defined for this service. 
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