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Old 03-14-2021, 01:23 PM   #1
Mycroft_Groks
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Member#: 522534
Join Date: Feb 2021
Vehicle:
2016 WRX
Blue

Default Help with an OBD2 splitter

I'm looking to wire up a two way splitter to a three position rocker switch on my dash that allows me to power one OBD2 device at a time. I have two devices I want to hard wire to my 2016 WRX, Cobb Access point and an OBD2 reader. I want them both to power off when the car is turned off as well.

Any help would be great.
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Old 03-14-2021, 04:01 PM   #2
Mulder
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15 WRX/11 CRZ

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Even with only one of them powered at a given time, having both devices connected to the OBD port with a passive splitter will probably load the data lines and may cause issues with the ECU and other systems. I don't think this is a workable idea unless all the connections can be switched so the unused device is completely disconnected.
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Old 03-14-2021, 04:05 PM   #3
murrdogg24
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Crystal White Pearl

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I have a plug in splitter on mine with AP and OBD2 gauges on my headunit, works fine.
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Old 03-14-2021, 04:21 PM   #4
Mulder
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15 WRX/11 CRZ

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Ok, didn't think it would but carry on then.
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Old 03-14-2021, 04:56 PM   #5
Mycroft_Groks
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Blue

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Do you guys know which pin is the ignition on power? If I switch the always on power 16 pin with this one, the devices will turn off when the car is not on.

Last edited by Mycroft_Groks; 03-14-2021 at 05:16 PM.
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