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Radio Antenna Replacement
 
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Pelican Technical Article:

Radio Antenna Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$300

Talent:

****

Tools:

T25 Torx

Applicable Models:

BMW Z4 Convertible (2003-06)
BMW Z4 Coupe (2006)

Parts Required:

Antenna booster or Antenna

Hot Tip:

Disconnect battery before working with electronics

Performance Gain:

Repair faulty antenna

Complementary Modification:

Install aftermarket radio

Most electrical components on BMW Z4 models require programming using an advanced BMW scan tool when replacing. With that said, don't feel you can't replace these items yourself. You also have the option of swapping out used items, which will at times work with programming. I don't have experience with this method, due to my access to a BMW scan tool, but it is something to consider. I have been told programming of used items isn't always required, so this may be an option, but I cannot vouch for it working 100% of the time. If you have experience with used part installation, please share your experience as it will help the Pelican Parts community.

BMW Z4 models can come equipped with a shared radio, mobile telephone antenna system and GPS antenna. An antenna rod mounted in the left rear fender, an antenna base and the aerial amplifier mounted just below the antenna base inside the trunk. The high-frequency radio station signals are received by the antenna (FM1 / AM).

In the BMW Z4, 2 physical aerials are connected to the radio aerial diversity, i.e. the rod aerial and the aerial in the bumper. The aerial diversity function switches over to another aerial as soon as the system undershoots a defined threshold. Changeover takes place in such a way that no interruption can be heard. Depending on the reception situation, reception on both aerials simultaneously is also possible.

The signal quality of the currently selected FM antenna (FM1 to FM4) is evaluated and assessed in the antenna amplifier / diversity module. FM antennas are selected depending on whether the signal quality of the received radio station deteriorates in connection with the active antenna or remains strong. When antennas are switched, no interruption is heard. This function allows the greatest FM signal to be used at any given time.

If you have static in FM or AM, the problem may be an amplifier, diversity module or one of the antennas.

The antenna amplifier / diversity module is located in the rear bumper. If you have a rear collision, this item is likely damaged. See our tech article on rear antenna aerial and rear bumper for more information.

If you have a water leak in your trunk, inspect the antenna base seal for leaks. Water will be seen leaking past the module in the trunk.

Remember your car may have been serviced before and parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve as they grow older. If something seems different, let us know and share your info to help other users. Questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

The FM1 antenna is mounted to the left rear fender (red arrow), the antennas amplifiers are mounted directly below the antenna and in the rear bumper.
Figure 1

The FM1 antenna is mounted to the left rear fender (red arrow), the antennas amplifiers are mounted directly below the antenna and in the rear bumper.

Remove the antenna rod by unscrewing in a counterclockwise direction (red arrow).
Figure 2

Remove the antenna rod by unscrewing in a counterclockwise direction (red arrow).

Working in the trunk, locate the antenna amplifier.
Figure 3

Working in the trunk, locate the antenna amplifier. Red arrow points to location, inset shows amplifier when viewed from below.

To replace one of the antenna amplifier, start by loosening the T25 Torx screw (red arrow).
Figure 4

To replace one of the antenna amplifier, start by loosening the T25 Torx screw (red arrow).

Once the fastener is loose, remove the antenna base (red arrow) from the fender.
Figure 5

Once the fastener is loose, remove the antenna base (red arrow) from the fender. When installing, align the angled edges of the base and mounting hole (blue arrows).

Next, disconnect the electrical connectors.
Figure 6

Next, disconnect the electrical connectors. Pull the center connector straight out (red arrow). Squeeze the release levers (blue arrows) and pull the final two connectors straight out to remove.

Remove the amplifier from the vehicle and replace with new.
Figure 7

Remove the amplifier from the vehicle and replace with new. You can replace with new or used unit, no programming required. Be sure to match the part numbers on the amplifiers.



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Page last updated: Wed 12/7/2016 03:00:34 AM