Page 2 3 Usage Notes will appear directly after the description verbiage or under the group header 4 Trim Codes will appear in either the description or usage field 5 Reference to illustration page and callout number in text description field GRAPHICS 1 New style illustrations will begin with the 1992 vehicles 2 Each callout will contain usage statements complete with years and options 3 General notes will display at the top of the illustration 4 Kit notes will appear in callout format following callouts 5 Specific notes will follow kit callout 6 RPO definitions will follow specific notes J SERVICE CONCEPTS 1 Production Fuel Senders have a tag with a 3 letter code gn the Sender Hgrnsss Utilize this code when more than one design is available on certain models within a given year This code will help to determine not only the sender but also components such as fuel pumps 2 Electronic Brake Control Modules ABS Controllers catalog group 4 720 are serviced through GMSPO for cases of fire theft crash or flood Otherwise these units should be exchanged through an AC Delco Repair Center For additional information refer to your re spective service bulletins 3 lnflatable Restraint Diagnositc Energy Reserve Modules DERMS catalog group 14 865 are serviced through GMSPO for cases of fire theft crash or flood Otherwise these units should be exchanged through an AC Delco repair center For additional information refer to your respective service bulletin J