[Gmecm] 1227165 ARAP Heads Up Service Mode?

[Robert Fleming]

check if a prom is present?  It goes into default limp home mode if the prom isn't there or if the checksum doesnt add up.  Not sure what the heads up/service mode is.  

Dan Grostick <tech_auto at bellsouth.net> wrote:
In the 165 there's a reference to Heads Up / Service Mode and a check if a 
prom is present. What's this about?

Thanks

Dan


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