Question about GMC Sierra 3500
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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