Question about GMC Sierra 3500

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I have an 03 GMC 3500 dually that the driver's side fender running lights won't light up. The passenger side work fine. Also my reverse light doesn't light up either.

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Are the bulbs good ? Did you check for B+ voltage at the lamp sockets ? The passenger and the driver side get B+ voltage from the same place . Do you know how to do automotive electrical circuit testing with a DVOM - digital volt ohm meter ? Do you know what a wiring diagram is ? How to use it to find testing points in a electrical circuit ? Here is a web site for free wiring diagrams .
http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size . Under system click on lighting , then under subsystem click on exterior lighting . Click the search button , then on the blue link's . The light's on the fenders are maker lamps ! Now here is were it gets tricky , if you look at the diagram on the right you will see the back up lamps are controlled by the BCM - body control module . The BCM gets a turn on signal from the PCM -engine computer , because the transmission range switch is a input to the PCM . This can be very confusing to someone you doesn't deal with this sort of thing . Hooking up a scan tool that can view this type data would be the easiest way to trouble shoot .

ECM Inputs and Outputs Diagnosis

Electric Testing Techniques You Need to Know

Posted on May 02, 2017

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Posted on Jan 02, 2017

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