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Radio Amplifier and Telematics Module Replacement
 
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Pelican Technical Article:

Radio Amplifier and Telematics Module Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$300

Talent:

****

Tools:

Flathead screwdriver, trim panel tool, 8mm socket

Applicable Models:

BMW Z4 Coupe/Conv (2006-08)

Parts Required:

Amplifier

Hot Tip:

Disconnect battery before removing amplifier

Performance Gain:

Repair faulty amplifier

Complementary Modification:

Install aftermarket radio

Most electrical components on BMW Z4 models require programming using an advanced BMW scan tool when being replaced. 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 two types of amplifiers, depending on options. Stereo / HiFi amplifier and Top HiFi amplifier. The sound frequency output sent to the amplifier from the radio is dependent on the speaker configuration. Only the frequency range can be effectively reproduced by the connected speaker system. For example if high, mid and low-range speakers / woofers are connected to the amplifier, the frequencies for those components are sent.

Stereo / HiFi amplifier

HiFi amplifiers are amplifiers with active frequency gates. Active frequency gates achieve better acoustic results than passive frequency gates. The HiFi amplifier does not have speed-dependent volume adjustment or speed-dependent equalizing. The function of the HiFi amplifier is only to amplify the low-frequency output.

Top HiFi amplifier

The digital Top HiFi amplifier corresponds to the previous DSP amplifier as already used in other BMW models. The special features on the Z4 are the two high voltage output stages (30 V) for the Carver woofers. The Top-HiFi amplifier has 2 analogue inputs (left and right). In addition, the Top-HiFi amplifier features a digital input for the

Audio System Controller (radio / business radio CD)

The Audio System Controller is integrated in the radio / business CD control unit. The radio manages all audio signals. The differences between the systems are in the control of the amplifiers. The HiFi and Top-HiFi amplifiers do not feature direct control functions.

Amplifiers

The amplifier has a separate power supply. The amplifier is switched on by the RAD_ON signal from the radio (> 8 V = ON / < 6 V = OFF).

The HiFi amplifier is controlled via the radio. The required settings are selected in the radio and output via 4 radio outputs to the amplifier. The amplifier amplifies the settings and distributes them over 10 channels. No variable matching takes place in the HiFi amplifier. Vehicle-specific equalizing is integrated in the HiFi amplifier.

The Top-HiFi amplifier is also controlled via the radio. The Top-HiFi amplifier receives a constant audio signal for the left and right (via the two audio inputs) from the radio. The required settings are transferred via the K-bus and formed in the amplifier.

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 include your vehicle information.

Close the convertible top.
Figure 1

Close the convertible top. Remove the adjustable trunk shelf. See our tech article on adjustable storage shelf replacing. Working in trunk, lever out the two plastic trim clips (red arrows) using a trim panel tool.

Lift carpet trim (red arrow) and remove from the trunk by sliding it straight out toward the left side of the vehicle.
Figure 2

Lift carpet trim (red arrow) and remove from the trunk by sliding it straight out toward the left side of the vehicle.

Lift floor carpet trim and remove from the trunk (red arrow).
Figure 3

Lift floor carpet trim and remove from the trunk (red arrow).

Next, pull the center console release knob out of the carpet (red arrow), then push it back through to the other side.
Figure 4

Next, pull the center console release knob out of the carpet (red arrow), then push it back through to the other side. The carpet may stretch a bit to accommodate it. Remove the rear trunk shelf.

Lift the carpet trim up and hold it in place with a piece of wood (red arrow).
Figure 5

Lift the carpet trim up and hold it in place with a piece of wood (red arrow). The amplifier (blue arrow) is now visible.

Peel the Velcro strap open and remove it from the amplifier mount (red arrow).
Figure 6

Peel the Velcro strap open and remove it from the amplifier mount (red arrow).

To disconnect the electrical connector, press the small button (red arrow) and rotate the connector lock 90° to disconnect it.
Figure 7

To disconnect the electrical connector, press the small button (red arrow) and rotate the connector lock 90 degrees to disconnect it.

Slide the amplifier down at an angle to remove.
Figure 8

Slide the amplifier down at an angle to remove.

Once on a bench, you can remove and inspect the fuse located at the bottom.
Figure 9

Once on a bench, you can remove and inspect the fuse located at the bottom. Replace if blown and reinstall the amp to see if it begins to work. If not, replace it. Reverse steps to reinstall.

To replace the Telematics module, working at the module bracket, remove the three 8mm nuts (red arrows).
Figure 10

To replace the Telematics module, working at the module bracket, remove the three 8mm nuts (red arrows).

Lift the bracket off the body and lay it down enough to access the electrical connectors.
Figure 11

Lift the bracket off the body and lay it down enough to access the electrical connectors. Press the coaxial connector release tabs (red arrows) and pull straight off to disconnect. When reinstalling, use the color coded squares on the module to help identify connector locations. Then, disconnect the main electrical connector (blue arrows), press the small button and rotate the connector lock 90 degrees to disconnect it.

Once on a bench, you can remove the module from the bracket.
Figure 12

Once on a bench, you can remove the module from the bracket. Remove the three 10mm fasteners (red arrows). Reverse steps to install the Telematics module.

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Page last updated: Mon 12/5/2016 03:05:07 AM