GMC 2003 Envoy - Manual (Page 284)

Overload Protection
The afr suspeflsiort system is equipped with overload
preteclion. Overload proleclrdn is ds^igned to protect the
air suapension systemi, god it is an ieriiCBlor to the
driver lhal lhe vehide Is ovGriDadecI Wheo the overload
prolectioh rrradp
13 on, it will nol allow damage lo Ihe
air compressor However, do not overload the vehicle
See
Laadtng Your Vehicle an page 4-^8r
If the Suspension remains al a low height, the rear axle
Joad has exceeded GAWR (Gross Axle Weight
Rating). When the overload protection mode is activated,
the compressor operates for aboul 30 seconds to pne
minute without raising ihe vehicle depending on the
amount ot ovErioad, This will conlinue each lime
the ignition is turned on unlil Ihe near anJe load
js
reduced below G awr ,
Indicator Light
The indicator light on the inllator switch in the rear
passenger compartmenl also serves as an indicator for
internal system emor It Ihe Incficfilor light is flashing
without Ihe load ieveJmg tunclion or the infiator being
active, turn oft the ignition. The next day turn on
Ihe lignition artd check Ihe incficaloi light. The vehicle
can be driven with the tighi flashing, but if it is you
should have the vehicle serviced as soon as possible
Adding a Snow Plow or Similar
Equipment
Your vehicle was neilher designed nor iniended ior a
snow plow,
Notice: Adding a snow plow or similar equipment
Lo your vehicle can damage It, and the repairs
wouldn't be covered by warranty. Do not install 0
snow plow or similar equipment on your vehicte.