Acura 3.5 RL Manual page 1127

Standard Sound System:
Cavity Wire Connects to
Bose Sound System:
Cavity Wire
Terminals B1, B2, B3, B4, B6 and B7 are not used.
With Navigation System:
Terminal C1, C2, C3, C5, C8 and C9 are not used.
*1: '96 -99 models
*2: '00-01 models
*3: With navigation system
Connects to