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



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ReadDataByIdentifier ($1A)
with specific DID to read certain ECU 
Id data). 

This step can only be performed after the enabling of the diagnostic response messages of 
SPS_TYPE_C ECUs. 

This step may be used for service (e.g., required for remote programming) to make sure that the 
tester is connected to the same vehicle as during the Request Identification Information 
Process. 
20 
Request the appropriate level of the 
ProgrammingMode ($A5)
service used to determine if it is OK 
to establish a programming event (send to all nodes/on all links). 

On 
HS-CAN
and 
MS-CAN
the sub-parameter 
level $01 (requestProgramming)
shall be used. 

On 
LS-CAN
the sub-parameter 
level $01 (requestProgramming)
or 
level $02 
(requestProgramming_HighSpeed)
shall be used.

The tester shall verify that no negative responses are sent prior to the next step which enables 
the programming mode. 

All ECUs shall respond. 
21 
Enable programming mode with service 
InitiateProgramming ($A5)
and sub-parameter 
level $03
(enableProgramming). 

No response to this request from any ECU. 

ECUs shall transition to high speed mode if high speed was specified in the previous step. 

The tester shall transition its protocol device to high speed operation (if requested for the low 
speed subnet) and wait before communicating at high speed 100 ms longer than the time value 
specified in service $A5. 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
CameraLoops.com


GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 277 of 336 

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