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

9.3.2.4.3.1 Pseudo Code. 
(Refer to the data dictionary of the application implementation of this service for 
variable definitions.) 
BEGINFUNCTION Boot_20_Msg_Recvd() 
CALL Boot_Exit_Diagnostic_Services() /* procedure defined below to gracefully exit all active diagnostic 
services */ 
ENDFUNCTION 
Each time a valid $20 message is received, or if a TesterPresent timeout occurs, the following function is 
called: 
BEGINFUNCTION Boot_Exit_Diagnostic_Services() 
Service_28_MsgReceived 

NO 
TesterPresent_Timer_State 

INACTIVE 
TesterPresent_Timer 

0 
IF (permanent diagnostic CAN Identifiers are not programmed) THEN /* For SPS_TYPE_C ECUs */ 
diagnostic_responses_enabled 

NO 
ENDIF 
IF (programming_mode_active = YES) THEN 
TransferData_Allowed 

NO 
programming_mode_active 

NO 
/***************************************************************************
* Reset CAN Protocol Device if high speed mode was active before doing
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GMW3110 
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February 2010 
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* S/W Reset 
**************************************************************************/ 
IF (high_speed_mode_active = YES) 
high_speed_mode_active 

NO 
CALL hnd_Init_CAN_Device() /* handler call to reinit the baud rate in order to prevent bus errors which 
could be caused if reset times differ greatly*/ 
ENDIF 
CALL Invoke_Sw_Reset() /* causes a software reset to occur */ 
ENDIF 
ENDFUNCTION 
Note:
The above pseudo code assumes that the ECU is unlocked when operating out of the boot software.