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

Procedure 2: 
1. Disable normal communication then send a requestProgrammingMode_HighSpeed message ($A5 $02) 
with extra data bytes. Verify the negative response ($7F $A5 $12) message. 
2. Send a requestProgrammingMode_HighSpeed message ($A5 $02) without disabling normal 
communication. Verify the negative response ($7F $A5 $22) message. 
3. If applicable, create conditions under which the node should not allow a programming event to take place 
in high speed mode. Then send a requestProgrammingMode_HighSpeed message ($A5 $02). Verify the 
negative response ($7F $A5 $22) message. 
4. Disable normal communication, send a requestProgrammingMode_HighSpeed message ($A5 $02). Verify 
the positive response ($E5) message. Send a ReturnToNormalMode ($20) request message and verify 
the positive response. Then send a request to enableProgrammingMode ($03) and verify the negative 
response ($7F $A5 $22) message. 
5. Disable normal communication, send a requestProgrammingMode_HighSpeed message ($A5 $02). Verify 
the positive response ($E5) message. Allow a P3
C
timeout to occur and then send a request to 
enableProgrammingMode ($03) and verify the negative response ($7F $A5 $22) message. 
6. Repeat steps 1 and 2 of Procedure 1 above (for high speed devices). Then send a request for this service 
with a supported sub-parameter. Verify the proper negative response (7F $A5 $22) and that there is no 
impact to the current programming event. Repeat this procedure for each supported sub-parameter of this 
service. In addition, verify that the device remains in high speed operation. 
Procedure 3: 
1. Disable normal communication, then send a requestProgrammingMode_HighSpeed message ($A5 $02). 
After receiving responses from all ECUs, send a requestProgrammingMode message ($A5 $01) when 
conditions are correct to begin a low speed programming event. Verify positive responses from all ECUs to 
the requestProgrammingMode request. Next send an enableProgrammingMode ($A5 $03) request. Verify 
no responses are sent to the enableProgrammingMode request and then verify that the ECU stayed in low 
speed operation by requesting an additional diagnostic service. 
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