![]() Thought the unit was bad so I put back the old one and same thing. When I installed the new unit and turned on the radio to test, I had static and terrible reception. A couple of things I noticed while installing the unit. He had no idea what it was and didn't seem to care. I was fortunate enough to buy a newer radio at a junkyard and managed to talk the guy into throwing in the antenna amplifier. Here are the relevant part #’s for the new antenna amplifiers: ![]() Luckily, your existing amplifier is stamped with the current frequency, so you simply need to pop the C*****ar off and do a visual inspection to determine which part you need to order from the dealer. You must first determine which frequency you have before you order an new amplifier. Important: There are 2 different frequencies used for the keyless entry system (315 MHz and 433 MHz). This amplifier also is responsible for the keyless entry in the car, so you may benefit from increased range with the new amplifier as well. If you want to upgrade to the newer style radio and not suffer any radio reception loss, you must replace the antenna amplifier in the rear C*****ar. Without that wire connected, there is a significant loss of reception in the AM / FM radio. The unused wire (I believe) is used to power something known as the antenna amplifier, which is located in the rear driver’s side C*****ar. There is an OEM antenna adapter available that converts 1 of the 2 adapters, allowing basic connectivity of a newer HU to a 99-01 car. The older style HU’s have 2 antenna connectors on the back of the radio, and the newer radios only have 1. The reason for this is because in 2002, BMW changed the type of antenna in the car (NOTE: In all coupes / sedans the antenna is in the rear window-it is not the shark fin or the bee antenna). NOTE: Sirius requires an 03+ radio.Īnyhow, the one caveat of doing this is a noticeable loss in AM / FM reception when putting the newer HU’s into the older car’s. Many people have swapped 02+ radios into their 99-01’s to take advantage of the increased functionality of the newer style radios (Sirius, AUX input, OEM iPod adapter). The 99-01 HU’s were made by Blaupunkt and the 02 – 05 radios were made by Alpine. This is a DIY for those who have upgraded their 1999 – 2001 radio head unit to the 2002 – 2005 style.
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