Having any bulb out on a CANBUS system can cause some wacky behavior. I assume that the '03 uses CANBUS and that the lights are tied into it, though I can't say for sure. I've never cared enough to look into it.
Either way, the sure fire test is to plug in stock tail lights and see if the behavior goes away.
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Last edited by particlewave; 03-15-2019 at 01:41 PM.
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