Question about Chevrolet Silverado 1500

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I was driving and smelled an electrical burning in the cab then the Cargo Lamp On displayed in the message center and the courtesy lights stopped working. I replaced the courtesy light fuse under the hood and It was blown immediately. I removed the inadvertent relay and the fuse did not blow. I tested both the inadvertent relay and courtesy lamp relay and they test good pulling 1.6 amps at 12 volts defiantly under the 10 Amp fused rating. I pulled all lamps which still blows the fuse, but now the Cargo Lamp on does not display in the message center until the switch is on. I would hate to believe it is the Body Control Module but that is all after I check for shorted wires. And why would it be a BCM only pull enough current to blow the 10 A fuse when the inadvertent relay was in the circuit which only pulls 1.6 amps?

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  • Stephen Yanowich Aug 02, 2011

    I apologize for not getting back to you after your comments on my problem and the solution. I have nerve damage, and I could not work without a high level of pain. Recently, I had surgery on two vertebras in my neck which has greatly minimized the pain allowing me to work more comfortably. You are correct the BCM was not the problem due to a direct short. It was an intermittent short in an aftermarket anti-theft device which the dealer said it was mandatory that I purchase this device if where to buy the truck from them. The unit had a key chip which pluged into a socket to enable the ignition. I disconnected the splice block from the orange courtesy light B+ wire. Since the aftermarket product was not in the service manual schematics, I had to trace each wire which took about 6 hours. I wanted to thank you for your reply once I found the problem but I can’t rate the solution probably due to the time.

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  • Master
  • 583 Answers

Its not the BCM PROBLEM.ITS THE SHORT circuit problem for sure.the wires has to be checked.most likely cause is a bad ground or a short circuit, probably in the radio .the wire could have chaffed on the edge of a piece of metal (which makes up the negative side of a cars electrical system) and the power is just going straight to neutral and blowing the fuse. check out. please do rate the solution.thank you for using fixya.keep updated.thank you.

Posted on Jul 14, 2009

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1 Answer

How do i bim and brighten dash light 2002 buick lesabre


bim or DIM ? the dimmer switch ! Interior Lamps
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• Reading courtesy lamps
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• Roof rail courtesy lamps
• Sunshade vanity mirror lamps

Interior Lamps Dimming
This group of interior lighting includes lamps which may be dimmed. This group uses a combination of class 2 controlled illumination and incandescent lamps:
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• Cigar lighter lamp
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• Heated seat switches
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For the interior lighting to be dimmed the following conditions must be met:
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• Headlamp switch is placed in to the PARK or HEAD position
• Ignition switch is placed in the ON position
Then all class 2 displays and all incandescent back lighting will be illuminated to the level set by the instrument panel (I/P) dimmer switch. When the I/P dimmer switch is moved from MIN to MAX, all class 2 displays and all incandescent back lighting respond from minimum intensity to maximum brightness.
The DIM supplies battery positive voltage to the coil side of the PRK LP relay in the rear fuse block.
When the I/P dimmer switch is moved from MIN to MAX, then the instrument panel module (IPM), W/CJ2, or climate control panel (CCP), W/C67, applies a message to the class 2 communication circuit to the DIM. The DIM then applies a ground to the park lamp relay control circuit. This energizes the PRK LAMP relay and allows battery positive voltage to be applied through the DIMR fuse to the DIM. The DIM then illuminates the following incandescent lamps through the incandescent dimming output circuit:
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The DIM also applies a message to the following class 2 controlled illumination components:
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The DDM will then send a message through the simple bus interface (SBI) to the RH front door module (RFDM). The door modules will then illuminate the following components through the incandescent dimming output circuit:
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• Power door lock switches
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The ground for these components are provided from the DDM and RFDM.
The following components are grounded at G200:
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• HVAC control assembly
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The following components are grounded at G201:
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Chevrolet 1977 And 1980 C and K Model Fuse Blocks

(The numbers, eg; "UF2" Cargo Area Lamp, are RPO numbers.)

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    Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

    Thank you for using FixYa, have a nice day.

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