It's been 8 years since I put 'em in, but if my memory is intact, yes, a part of the kit is a relay that goes in the relay panel behind the knee bolster and it'a a #!%*^ to get to.

-BTC

'98 V70 T5 5-speed, 166k mi, front IPD stabilizer bar, rear factory HD bar, Bilstein HD, Volvo strut tower brace and skidplate, e-codes, V-1, Mobil-1 since new

"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair." -- Douglas Adams (1952-2001)