Is it 13 pin electrics? From a very distant memory when I had one installed and had a similar issue I found pin 9, I think, wasn't populated. The wire was taped back on the loom. This was where the tow side plugs into the car harness. It may have been on the car side of the connector, as I say it was years ago. Once I inserted it into the plug everything worked.
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Current
04 S80 D5 SE Auto
03 S80 D5 SE Man
Previous Volvos
90 240 GL B230FB Auto
96 940 CD
13 V40 D2 R-design
89 745 GLE
98 V90 3.0 24v
98 945 Celebration Auto
96 965 SE Auto
86 744 GL
81 244 DL
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