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

Procedure 4: 
The steps in this procedure are to be performed sequentially. This procedure is to be started 
when the ECU has the service device control restrictions active, the MEC = $00, and the vulnerability_flag (if 
supported) not equal to $FF. 
1. Send a valid security access request message with $Level = $03. Verify the proper positive response. 
2. Send a valid security access request message $04 with a correct key and verify the proper positive 
response message. 
3. Verify that the device is now enforcing assembly plant device control restrictions by sending a device 
control command that is valid for the assembly plant restrictions but invalid for service restrictions and 
verifying a positive response message. 
4. Send valid $3E message within P3
C
ms for 2 minutes (provided that the device control chosen can be 
active for 2 minutes - if not, adjust as necessary) while maintaining the conditions which are valid for the 
assembly plant restrictions and invalid for service restrictions. Verify that the ECU keeps the device control 
active and does not send any device control limits exceeded $7F $AE $E3 $xx $yy reject messages. 
5. Stop sending TesterPresent ($3E) messages. Verify that after P3
Cmax
ms without sending a $3E message 
that the device reverts back to the service device control restrictions. This can be done by sending a 
device control command that is valid for the assembly plant restrictions but invalid for service restrictions 
and verifying the correct $7F $AE $E3 $xx $yy negative response message. 
Procedure 5: 
1. Send a valid device control request (mode $AE) and verify the proper positive response. Then send a valid 
security access request message $03 and verify the negative response $7F $27 $22 (the negative 
response is sent because device control is already active using service restrictions when the request is 
received). 
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