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Expert: CAJUNSC/RAMBLER390 - 1/12/2009


Question
2003 GMC Sierra - Interior lights and backup lights have quit working. These are also used for surround illumination. All fuses are good. Dome override switch NOT engaged.

Already Tried:
Checked all fuses, bulbs. Int. map dome lites work on the push button switch, not on opening the door or when unlocking or departure lites.

Thanks,
Jake  

Answer
hi
If you could have vehicle checked with a scan tool that has ability to see BODY data, this would cut diagnostics in half. See if BCM is commanding reverse lights/dome lamps ON
Both item you are having problems with have 2 common components, the BCM (Body control module) and the IP fues block (drivers side fuse box) I can also tell you I have replaced them both for mulitiple faults, such as you are experiencing.
Keep in mind also, you MAY have a wire problem with multiple wires chaffed/cut in harness in the drivers floor area, OR somewhere in harness, say possible due to rodents, etc...
These are JUST suggestions.
Good Luck
God Bless

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CAJUNSC/RAMBLER390

Expertise

1998 and NEWER questions ONLY!! I WILL REJECT QUESTIONS FROM 1998 BACK. Electrical diagnosis. Brake Diagnosis. Driveability, Service Engine Soon Lights. Engine mechanical. Automatic or Standard Transmissions. Drive Line (drive shafts, axles) Rear and front differentials and 4wd Transfer Cases. Tires and wheels. ABS. HVAC. Air Bag (SIR). Interior, seats, etc... 6.6L Duramax Diesel diagnosis. 6.5L diesel diagnosis. I WILL not answer Alignment questions OR carburetor questions.
I need YEAR, MAKE and MODEL of vehicle, and ENGINE SIZE and TRANSMISSION type, IF applicable to the question. The more information, the better.
EFFECTIVE Jan. 2012, I will not answer questions about PARTS or AFTER MARKET installed items.(After Market radios, entertainment systems, alarms, etc...)
I work at a Large, Busy GM Dealership
Last thing, my answers are JUST SUGGESTIONS and ADVICE and you should ALWAYS CHECK with your mechanic for proper diagnosis and repair.

Experience

18 Years GM Dealership experience as an "A" line tech. ASE Master Technician. A-9 Light duty Diesel certified as of 2011. 100% GM certified MTC Certified. GM World Class Technician.

Education/Credentials
High School graduate. No College or higher learning.

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