OBD Splitter Harness
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TECH Fanatic
Joined: Jul 2008
Posts: 1,570
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OBD Splitter Harness Just some added info for everyone......... When doing the LS swap in Chris's car with Dakota Digital parts....... I wanted to be able to use a Scanner, and the OBD plug needed to be plugged into the Dakota control box......So I bought a OBD splitter to achieve both functions.......After Chris took the car on the Power Tour it started doing goofy things,,,,,Half the dash gauges would quit working while driving, then the cooling fans wouldn't turn on.......... Hummm !!!! .......They wired the relays with a switch to get the fans on...... and the gauges would sporadically go out....... Finally got the car home and found out the Splitter harness was the problem as it wasn't transmitting all the info thru the harness......Took it out and everything works perfectly now...... Defective splitter harness...... Just passing the info along !!!!
Ken
Ken
I bought a Autometer obd splitter and had issues as well. I have a Dakota Digital bim module and I thought I'd use the splitter so I'd have a open obd port but now I just unplug the bim module when needed.
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Joined: Nov 2011
Posts: 346
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From: Tampa, FL
Is this just an issue with Dakota Digital?
...
I have had an OBD splitter in my kids 2018 Challenger for the past two years in order the have a Linxup tracker and also keep the standard port in the factory location, it has never had any issues. I have just (< than 10 miles ago) added a splitter in my LY6 (ECM = E38) to allow for a hidden tracker, no tracker yet, I haven't had any issues with the challenger yet.
...
I have had an OBD splitter in my kids 2018 Challenger for the past two years in order the have a Linxup tracker and also keep the standard port in the factory location, it has never had any issues. I have just (< than 10 miles ago) added a splitter in my LY6 (ECM = E38) to allow for a hidden tracker, no tracker yet, I haven't had any issues with the challenger yet.
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Update..... Jeff and Judy's 1955 Pontiac Station wagon that was LS swapped two years ago had a problem while on Crusin the Coast down in Biloxi, Ms.......... Jeff called and told me the car overheated and the fans wouldn't turn on........ Hummm!!!..... I asked what other symptoms the car was showing...... He told me the Temp gage and the oil pressure didn't work........ (Same symptoms as Chris's car had)...... Told Jeff to remove the OBD harness...... He did and everything works again...... Gary's Biscayne had the same problem also...... Just Say'in !!!!!!
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Joined: Jan 2018
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From: Dade City, Fl.
I tried the same thing with my '71 Camaro 6.0l swap with Dakota Digital gauges. I contacted DD tech support and they told me the signal gets "linked" to a connection that it will communicate with. Usually only one. Here is an explanation from the EFI forum https://forum.efilive.com/showthread...-the-OBD2-data See Post #6
From my experience it doesn't seem like the OBD signal likes to be split with the Dakota. I know for a fact you can't use a splitter and Tune the PCM, at least with HP Tuners, the BIM module has to be unplugged.
Just to add some info to the topic. On my Chevelle With a GM computer and DD gauges. I had Speartech harness built with two OBD II ports with the hopes of being able to access the the available port for diagnostics wile leaving the the DD gauge plugged into the other port, The tech at Speartech advised this would work. In the end, it didn't work and I have to Unplug the DD to use a scanner.
