I just got the original window sticker for a 1995 E300 diesel I bought from the seller. It says 'prewiring for cellular phone/CD changer'. Where would the wiring go to for the CD changer? It still has the original radio in it.

In my 1999 E300TD it is in the left rear wheel well so I looked in the '95 but I couldn't get the trunk panels off. Thanks!

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles