| there is a pull-up (or is it pull-down?) resistor that needs to be changed depending on the year. the problem lies in the signal of the RX data: either peak/low voltage or the rise/fall of the leading edge. so far my home made DDL connector has worked on all years except for a 92 TT that i came across. it has worked on: 90NA, 94NA, 94TT, 95 NA, 96 NA, 96 TT (auto and JWT MT).
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