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

 
((manufacturers enable counter > $00 or vulnerability flag = $FF), and security has been accessed 
(SecurityAccess ($27) request has been sent)).
 
1. Send a valid security access request message with $Level = $01. Verify the proper positive response 
($0000 seed if unlocked and non zero seed if locked). 
2. This step is performed when the seed in the above step is a non zero value. Send a valid security access 
request message $02 with a correct key and verify the proper positive response message. 
3. Verify that the device is now unsecured by attempting a secure mode and verifying the appropriate positive 
response. 
4. Send valid $3E message within P3
C
ms for 2 minutes. Then verify the device remains unsecured by 
attempting a secure service and verifying the appropriate positive response. 
5. Stop sending TesterPresent ($3E) messages. Verify that after P3
Cmax
ms without sending a $3E message 
the device is secured by requesting a secure service and verifying the appropriate negative response. 
Procedure 5: 
This procedure is to be performed when the ECU vulnerability flag is not $FF (if supported) and 
the MEC = 0.
 
1. Send a valid security access request message $01 and verify $67 $01 $seedMsb $seedLsb response. 
2. After step 1 is complete, send a security access request message with level $02 and an incorrect key. 
Verify $7F $27 $35 response. 
3. Repeat step 1 and 2 of this procedure and verify that the response from step 2 (the second level $02 
message) changes to $7F $27 $36. Then send a request for this service with $Level = $01 within 10 s and 
verify $7F $27 $37 message. 
4. After performing steps 1 through 3 of this procedure, verify that the ECU remains locked by attempting a 
secure service and verifying the correct negative response. 
8.8.7.3 Verification Procedures for Device Control Security Levels ($03, $04). 
The procedures below shall 
be followed if the ECU supports the Device Control security access levels ($03 and $04). 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 6 below, the verification procedures shall be performed after the ECU has 
been powered up (executing operational software) for at least 10 s. 
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