I have a check engine light on in my '02 Chev. Silvarado....but code reader can't read anything as the cigarette lighter is out...fuse panel on left of dash doesn't specify which fuse that line is on and none of the fuses look bad....is there some in-line fuse that I can't find?
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Check the cigarette lighter fuse. This is what powers the DLC. If the fuse is good, check and see if the lighter works. If not, you have a bad wire. Code readers have to have power from the car. Most scanners have there own power and will read the computer, unless the data wire is bad or the computer is bad.
Check to make sure that the fuse to the cigarette lighter is not blown or that something like a penny has not found its way in there and shorted out the fuse. Check all the fuses because it will throw the diagnostic tool off if they are blown. *** Please rate me on this answer.***
Does the code reader power up? If not, check the fuses. OBD II ports supply power to the code reader. Typically GM uses the cigarette lighter fuse to power the OBD II port on their vehicles (could share a fuse with somthing else, but I doubt it). Good luck!
This is Fuse 32 under the hood in the fuse box.
I had a problem with this fuse as well. I don't smoke so didn't care
when I first realized my lighter didn't work, but my check engine light
came on and when I took it to get the engine code read, the part they
connect to under the dash (ODBII) would not give them a code. I left
the store not knowing why my check engine light was on and annoyed
there was another problem to fix. After a few hours of troubleshooting
with my Dad, we figured out the same fuse that controls the lighters is
the same one that powers the OBDII system, and Onstar as well. I hope
that info helps someone else.
here's the 2004 owners manual http://www.mediafire.com/?xgh2ucexzld