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MIL light not working
Posted to Technical Discussion Forum on 7/27/2016 8 Replies

I initially went through the Alldata diagnostic testing procedure that ended up with the suggestion that the MIL bulb needed to be changed and of course it cannot be, since its a surface mounted pcb LED of some sort. I then switched out the cluster with one from an old junker in our back lot, same car just few yrs older, but all still the same animal. The MIL still not lighting, so pretty much ruled out it being a bad bulb or LED. I tested for ground control at X1 connector and that was good, the computer was doing its part and grounding the MIL circuit..same at the cluster. I backtracked the power feed for that circuit to X4 connector, pin K4 at the under hood fuse block and there was 0V there KOEO. The only fuse I could associate with the circuit was the air bag display fuse but it checked out fine (air bag display on cluster was working as well). Since not getting power coming out of the fuse block, I am leaning towards condemning the fuse block (circuit board issue). Any suggestions welcome

Chris Cote
U Need A Cab
North Bay, Ontario, Canada

8 Replies Received (View Replies)


car Vehicle Data

2009 Chevrolet Impala LTZ 3.9L

Engine3.9 L
Trans4-speed Automatic (Electronic)