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usually just need to pull the fuse or relay out , if you want to check the wiring to the fuse box then i would expect will have to remove all fuses to gain acsess, disconnect the battery first
Any light's lit on the instrument cluster ? Wrench symbol , check engine ? Any messages - DIC - driver info. center ? 2007 Chevy what 2500 hd ,silverado etc... What size engine 6.6 L .Probably a problem with electronic throttle control . Your best bet ,dealer
On both the V6 and V8 engines the Oil Sensor is located on top of the engine at the rear. You will need to remove the top of the intake manifold to get to it.
{: ) It will be helpful if you can elaborate more on this concern and also note down any other symptoms that you may notice. It's because there are many GM bulletins that may apply to your problem.
Anyway we can just round off some possible causes and fixes for the moment.
If only the DIC screens on your cluster are going dim or blank despite adjustments on the backlighting knob near the main headlamp switch, the problem is internal to the cluster, and it can be fixed by an electronic service center. The other option is to have it replaced and programmed.
If the DIC buttons doesn't seem to work, remove the DIC connector and check the black wire for a good ground connection. You may also try removing the IPC fuse at the underhood fuseblock for 20sec while the igntion is off. Then reinstall the fuse and turn ignition on, and recheck button functions.
Another option is to diagnose the DIC inputs and cluster operation using a GM scan tool. It can monitor better the signals from your DIC. The scan tool may also reveal some codes that can be relevant to solving the problem, like a wiring or a component issue.
{: ) If you are referring to the IPC message screens going blank, and the gages and warning indicators seem to be working normally, the problem is not the fuse but an IPC internal circuit fault.. So better be ready for a new one. A replacement IPC will be that of later model versions. It will be programmed to your vehicle, and the mileage record will be reset to zero.
you may have bad horn, take a test light and see if power is going to horn when horn is pushed, if theres power going to it then you have a bad horn,if theres no power to it then check the horn relay. but il bet if the fuse is good then the horns are bad.
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