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 256 of 336 
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If the utility file is designed to allow individual calibration modules to be programmed, then the boot 
software shall be capable of reporting the SWMI and SWMIAC for each calibration module once it has 
been programmed into the ECU. 

Support of Traceability data (DID $B4) and Broadcast Code (DID $B5) may also be required based on 
regional practices. If any/all of these DIDs are required, they shall be specified in the CTS (or SSTS or 
supplemental diagnostic specification referenced by the CTS or SSTS). 

The boot software shall be capable of reporting the Software End Model part number (DID $CB). 
9.3.2.4.2.1 Pseudo Code. 
(Refer to the data dictionary of the application implementation of this service for 
variable definitions.)
 
BEGIN FUNCTION Boot_1A_Msg_Recvd() 
IF ($dataIdentifier is NOT supported) THEN 
send Negative Response ($7F $1A $31) /* Request Out Of Range */ 
ELSE 
IF (device cannot respond with block contents within P2
C
ms) THEN 
send Negative Response ($7F $1A $78) /* RequestCorrectlyReceived-ResponsePending */ 
ENDIF 
/*Get data values from memory address associated with the $dataIdentifier*/ 
send ($5A $dataIdentifier $Data) /* send response message with DID data */ 
ENDIF 
ENDFUNCTION 
Note:
The above pseudo code assumes that the ECU is unlocked when operating out of the boot software. 
9.3.2.4.3 Service $20 - ReturnToNormalMode. 
This mode is required to conclude a programming event. 
Receipt of a mode $20 (during a programming event) requires the ECU to perform a software reset. If a high 
speed programming event was enabled on the low speed SWCAN link when a request for this service is 
received, then all ECUs (including the tester) shall re-initialize their protocol converter hardware. The low 
speed ECUs shall perform the software reset after re-initializing the protocol converter hardware. 
There are no responses allowed to this service during a programming event.