I have a cassette player as part of the stereo system in my 05 Toyota Highlander and use a cassette adapter for my XM radio. I started hearing a clicking noise when the adapter is in, so I tried my iPod (also has a cassette adapter). I hear the same clicking noise so am guessing the cassette player is causing it. Is there anything I can do to fix it?

Do you have base or up;level system ?

Table 1: Radio Features
Table 2: Cassette Features
Table 3: Compact Disc Features
Table 4: XM Advisory Messages
The radio receives power from the RADIO fuse in the junction block-right I/P. Ground is provided via G201 and G202. The radio is enabled/disabled by class 2 messages from the body control module (BCM). The radio routes audio signals from the digital radio receiver or the vehicle communication interface module (VCIM) to the speakers and/or amplifier when directed by class 2 messages.
The Entertainment System on this vehicle is configured with an AM/FM stereo radio with the radio data system (RDS) and either a cassette player or a CD player or both. CD and cassette. The uplevel system provides the customer with extended range speakers and an audio amplifier. Satellite digital radio (U2K) is available with uplevel systems.
The following list shows the radios available for this vehicle:
• Radio (ULO) - AM/FM Stereo, Cassette with RDS
• Radio (UNO) - AM/FM Stereo, CD and RDS
• Radio (UPO) - AM/FM Stereo, Cassette with CD and RDS .The complexity of the radio systems on these vehicle is mind blowing .

Your best bet take it to a GM dealer , has features you are unawear of .
DTC B1025, B1035, B1045, or B1055
When the radio is powered up, the radio supplies low level audio signals to the speakers. If the vehicle is equipped with an audio amplifier, the amplifier will boost the signal sent to the speakers.
DTC B1025 Audio Output Circuit
Install a scan tool.
Turn ON the ignition, with the engine OFF.
With the scan tool, monitor the DTC Information for DTC B1025.
Does the scan tool indicate that DTC B1025 is current?

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Nissan - Factory Car Stereo Repair

You need a FM direct adapter its plugs in behind the radio in your antenna. the part number is FMDA25its says Siruis but it works for XM.

I am not sure about repairing the unit. Do you have a CD cleaner?
You might check with a reputable auto electronics shop, one that specializes in car audio. They may have an adapter that will allow an aftermarket radio to be controlled from the steering wheel. Rosen makes a nice am/fm/cd/dvd navigation unit that also has XM and iPod inputs. The hard part will be to find supporting interfaces and wiring harnesses to fit a 99.

The belts are probably shot in the cassette player that's 13 years old. You can probably buy another radio like it and just change out the cassette portion if you are a good electro-mechanical person.

Unfortunately your tape play has the auto reverse feature. It is detecting that the tape is not turning via a reel counter. Sensing no movement ( as you have an audio adaptor inserted rather than a real tape) it is trying to switch to the other side of the tape.
Not very much you can do.
You could purchase an FM modulator and basically re-transmit the Xm over an un-used frequency on the FM band to slve your problem

You have to pull the radio out of the dash, the antenna socket is on the back of the radio. You cannot see or get to the back of the radio whilst it is still bolted to the instrument panel.

The jacks are for the subwoofer output, you need a reciever with
a front input jack, or if it is a cassette, a cassette adapter.
Good Luck
Leadispenser

From the XM user's manual, page 14.

1. Make sure your SKYFi2 is turned off. Unplug any accessory from SKYFi2’s audio jack.
2. Turn on an FM radio and place it close to your SKYFi2.
3. Tune the FM radio to each of the following FM frequencies: 88.1, 88.3, 88.5, 88.7, 88.9, 106.7, 106.9, 107.1, 107.3, 107.5, 107.7, and 107.9.
4. Note the frequency that has no FM station or the least amount of interference.
5. Turn on your SKYFi2.
6. Press the “menu” button.
7. Use the scroll wheel to select “FM Frequency.” Press the “XM” button to confirm.
8. Use the scroll wheel to select the frequency noted in step 4. Press the “XM” button to confirm.
9. Press the “menu” button to return to the main menu and then again to return to the play screen.
10. You should now hear XM programming over your FM radio. If the sound is not clear or you hear
interference or static, try another frequency by repeating the process above.

there is a problem in the tape drive - possibly a bad belt- thats why the cassette adapter keeps ejecting itself- most add on xm tuners have the ability to broadcast its signal wirelessly-you press the menu button then turn the tuner to select the menu option that you want then press on the tuner control again to choose broadcast (fm signal and which channel you want to broadcast to the factory radio-try www.xmradio.com for more detailed info