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

GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 255 of 336 
address range restrictions in the programming routines). It is recommended that the boot software is not 
capable of being modified by the same programming erase/write routines that are used to modify the 
operational software and calibrations. Programming the boot software as part of the SPS programming 
process may be allowed provided that a mechanism is in place to ensure that there is 
no
possibility that the 
ECU could fail at a point in the programming process where it cannot recover and be programmed with a 
subsequent programming event. The ECU supplier and the appropriate GM Engineer(s) (Release, Service, 
and Manufacturing) must review the mechanism implemented and agree that it meets the requirements if the 
boot is to be programmed as part of the SPS process. If the boot software can be reprogrammed as part of the 
SPS process, then the boot software should be a unique software module with a unique part number. 
Changes to the boot software in a production ECU shall result in a change to the ECU hardware part number 
(DID $CC) in a module where the boot software is not reprogrammable via the SPS system (e.g., the boot may 
be capable of being modified at the supplier). However, changes to the boot software in a production ECU 
shall not result in a change to the ECU hardware part number (DID $CC) in a module where the boot software 
is reprogrammable via the SPS system. The part number of the software module containing the boot software 
would reflect the change to the boot software. 
9.3.2.4 Boot Software Diagnostic Service Requirements. 
The following are GMLAN Enhanced Diagnostic 
Service requirements for the boot software diagnostic service manager of a GMLAN SPS programmable ECU. 
An ECU that is programmed with operational software and calibrations must also meet the requirements listed 
in its CTS and/or SSTS. See the appropriate section of this specification for complete definition of each 
diagnostic service. 
Note:
Additional diagnostic services may be implemented in an unprogrammed or partially programmed ECU. 
These additional services must be defined in the ECU CTS. 
In each of the diagnostic services described below, only the minimum required sub-function levels and 
responses are listed.