1990 Honda Civic SI I was wondering if anyone here would have anymore ideas about what is going on with my rear lights. When I have the daytime running lights unit (DTRU) installed fully I have no rear tail lights. If I disconnect the DTRU completely I get no lights as well. Though if I connect only one of the two connections (4-pin) then all my lights work off the stem from the steering coloum. all the fuses are fine I'm looking into replacing the DTRU but after taking a voltmeter to it all the connections seem to be working.