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


GM WORLDWIDE ENGINEERING STANDARDS



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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 133 of 336 
DeviceContol_Security_Level 

ASSEMBLY_PLT 
TesterPresent_Timer_State 

ACTIVE 
DevCtrl_Bad_Key_Counter 


Send ($67 $04) message. 
ENDIF 
ENDIF 
WHEN ((($Level > $0A)AND($Level < $FB)) AND ($Level MOD 2 = 1)) 
/* vehicle manufacturer specific - request seed */ 
WHEN ((($Level > $0A)AND($Level < $FB)) AND ($Level MOD 2 = 0)) 
/* vehicle manufacturer specific - send key */ 
WHEN ($Level 
≥ $FB AND ($Level MOD 2 = 1)) 
/* system supplier specific - requestSeed*/ 
WHEN ($Level 
≥ $FB AND ($Level MOD 2 = 0)) 
/* system supplier specific */ 
ENDSELECT 
ELSE 
send Negative Response ($7F $27 $12) /*Subfunction Not Supported-Invalid Format*/ 
ENDIF 
ENDFUNCTION 
The following logic is executed periodically (suggested execution rate = 100 ms.): 
IF (Security_Delay_Timer > 0) THEN 
Decrement the Security_Delay_Timer by the execution rate. 
ENDIF 
8.8.7 Node Verification Procedures. 
8.8.7.1 General Procedures. 
Procedure 1: 
1. Send a security access request message with the sub-function parameter ($Level) equal to a value that is 
not supported and verify $7F $27 $12 response. 
2. If negative response code $78 is supported by the ECU, then create the conditions under which the ECU 
should return the $7F $27 $78 response and verify that proper response is sent. 
3. Repeat step 2 of this procedure for each possible reason an ECU would send the negative response with 
response code $78. Verify this for each applicable supported sub-function parameter. 
8.8.7.2 Verification Procedures for SPS Programming Security Levels ($01, $02).
The steps for Procedure 
1 below shall be performed within 10 s of the ECU being powered up (executing operational software). For 
Procedures 2 through 5 below, the verification procedures shall be performed after the ECU has been powered 
up (executing operational software) for at least 10 s. 
Procedure 1: 
1. Within 10 s of power-up send a valid security access request message $01 to an ECU when its 
vulnerability_flag !=$FF and its MEC = $00. Verify that the response is $7F $27 $37. 
2. Repeat step 1 of this procedure periodically (approximately every 500 ms) and verify that the $7F $27 $37 
response is sent each time until the ECU has been powered for 10 s. 
3. Send a valid security access request message $01 within 10 s of power-up to an ECU when the 
vulnerability_flag = $FF (if supported) and the MEC = $00. Verify the proper positive response message 
$67 $01 $00 $00. 
4. Send a valid security access request message $01 within 10 s of power-up to an ECU when the MEC > 
$00 and the vulnerability_flag (if supported) is not set to $FF. Verify the proper positive response message 
$67 $01 $00 $00. 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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