Found a whole list here
Season 1: [Sept 1982 - May 1983]
Tina Turner "Roll'N Down a River" (Knight of the Phoenix, pilot episode)
Quarterflash "Harden My Heart" (Knight of the Phoenix)
James Taylor " Carolina In My Mind" (Knight of the Phoenix, pilot episode)
Eagles " Peacful Easy Feeling" (Knight of the Phoenix, pilot episode)
Eagles "Take It Easy" (Knight of the Phoenix, pilot episode)
Fleetwood Mac "Don't Stop Thinking About Tomorrow" (Knight of the Phoenix)
Eric Clapton "I've Got a Rockin Roll Heart" (A Nice Indecent Little Town)
Juice Newton "In the Heart of the Night" (White Bird)
John Hiatt "Skin Game" (Hearts of Stone and Short Notice)
"Sweet Home Alabama" (Short Notice)
Bob Seger "Night Moves" (Night Moves)
Season 2: [Oct 1983 - May 1984]
The Rolling Stones "Give Me Shelter" (Goliath and Goliath Returns)
Willy Nelson "Don't let your babies grow up to be cow boys" (Big Iron)
The Beach Boys "California Girls" (KITT the KATT)
Survivor "Eye Of the Tiger" (Silent Knight)
Donna Summer "She works hard for the money" (Diamonds aren't a Girl's Best Friend)
Prince "When Doves Cry" (Diamonds aren't a Girl's Best Friend)
Shaka Kahn "Aint Nobody" (Diamonds aren't a Girl's Best Friend)
Pat Benetar "Love is a Battlefield" (White Line Warriors)
Prince "Little Red Corvette" (White Lines Warriors)
Michael Sembello "Maniac" (White Lines Warriors)
John Couger Meloncamp "When The Walls Come Tumbling Down" (White Line Warriors)
Season 3: [Sept 1984 - May 1985] Bonnie Returns
The Jacksons "It's Torture" (Knight of the Drones)
Pointer Sisters "Jump for My Love" (Knight of the Drones)
The Romatics "Talking in Your Sleep" (Knights in the Fast Lane)
Ray Parker Jr. "Ghost Busters Theme Song" (Knights in the Fast Lane)
Laura Branigan "Self Control" (KITT vs KARR)
Pointer Sisters "Jump" (KITT vs KARR)
Bananarama "Cruel Summer" (KITT vs KARR)
Yes "Owner of a Lonely Heart" (Knight in Disgrace)
Bob Seger "Still the Same" (Knight by a Nose)
Season 4: [Sept 1985 - Apr 1986]
Tina Turner "We don't need another hero" (Knight of the Juggernaut)
Annimotion "You're my obsession" (Knight Sting)
Bob Seger "That old time rock and roll" (Knight Song)
Huey Lewis and the News "Walkin' on a Thin Line" (Knight Behind Bars)
Hewy Lewis and the News "Finally Found a Home" (Killer KITT)
The Police "I'll Be Watching You"
John Cuger Mellencamp "Hurts So Good"
Men at Work "Down Under"
Fleetwood Mac "Gypsy"
James Taylor "Country Road"
Fixx "One Thing Leads To Another"