Where do I go to add passkey to a Bluetooth car radio/phone connector

Just got an LG G6. Have no problem connecting phone to bluetooth device. But every time I start the car, I have to put it into search mode to connect it. Keeps saying wrong passkey when I manually try to connect it. The passkey window never opens. I deleted all the other Bluetooth devices I had on it, restarted phone and same, it does not save. All my other devices connect and reconnect automatically, no problem. Just this one. Never had a problem on my Samsung S6

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