Hello,
There are a couple of fuses and some relays that run the system. Here are some guides and diagrams (below) to help you do some testing to figure out whats going on.
https://www.2carpros.com/articles/how-to-check-a-car-fuse
and
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
and
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
1 - 5 Amp Powertrain Control Module
2 - 20 Amp Trailer Tow Stop/Turn Lamps
3 - 10 Amp Audio Rear Integrated Control Panel, Compact Disc Changer, Radio
4 - 10 Amp Running Board Lamps
5 - 20 Amp Amplifier, Subwoofer Amplifier
6 - Not Used
Please run some tests and get back to us we are interested to see what it is.
Cheers, Ken
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Thursday, June 29th, 2017 AT 11:48 AM