Quote:
Originally Posted by RandomHero
You cant ground it on the new head units because it requires a special sequence to signal the safety feature. In Pioneers case I think they are all OFF-ON-OFF-ON. You can wire in a switch to the ground wire which should work? however I think it needs to go from seeing Positive to Negative signal so it cant just be a simple on/off. Don't quote me on that part though because I used a relay...
Regardless it is no longer as simple as grounding out the park wire.
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Can you link the relay you used?