This works on my 98 gs pioneer stereo, Make sure the ASL is on first. To get into the settings you need to press the CD button3 times while pressing buttons 1 and 6, Once the diagnostics auto test completes press and hold the AM button for 5 seconds until it beeps, The display will now show "AUDIO", The tape button toggles through F, R, and W for front , rear and woofer. The up/down button can set these from 0 to -80 dbs. The FM button toggles between P1, P2 and L, Where P1 and P2 are equalizer frequency settings and L is the overall level from 0 to -20 dbs. If you screw it up just disconnect the neg. battery cable and it will reset. Have fun..........