Firebird Monsoon + CD changer

[Steel Priest]

On 4th generation Firebirds what button on the radio switches to the CD changer in the trunk? Seems simple, right? On Camaros I've seen a "CD AUX" button. My 2002 Z28 had it. But on Firebirds I've only seen a "CD PLAY" button. The 1999 radio in my Formula has the "CD PLAY" button but won't control a CD changer. Even though it has the CD changer wire harness plug in the back of the radio. What gives? I didn't think something so simple would be so confusing.

The issue is due to the backlighting scheme I cannot use a Camaro radio in the Formula as it will look totally stupid. I have to keep the red Pontiac backlighting. Any advice is appreciated.

[SSTODD]

5 button on mine.

[hoogiesngrinderz]

Only late 1999 radios can control the CD changer. You have to physically open up the head unit to look for a certain part number printed on the circuit board.

Generally 97-99 CD decks cannot control the changer, 00-02 can. Add tape decks should control it. I got lucky when I bough a deck out of a 99 Camaro, paid 20 bucks just to get the charcoal face but it ended up being a late 99 model.

[Steel Priest]

Thanks guys for the input. I've also read on numerous websites that there's a specific GM part number on the casing of the radio that basically tells your if it can control the CD changer or not. Your advice is appreciated.