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One of the modules may be doing it , interior light lit -glove box ! Hard to say on newer vehicles , after 1996 ! You vehicle has some of these modules if not all !
The class 2 serial data line on this vehicle is a star configuration. The following modules communicate on the class 2 serial data line:
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The body control module (BCM)
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The digital radio reciever
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The driver door module (DDM)
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The electronic brake control module (EBCM)
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The front passenger door module (FPDM)
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The HVAC control module
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The inflatable restraint sensing and diagnostic module (SDM)
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The instrument panel cluster (IPC)
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The memory seat module (MSM)
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The powertrain control module (PCM)
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The radio
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The radio amplifier
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The rear seat audio (RSA) controller
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The rear seat entertainment (RSE) assembly w/U42
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The rear wheel steering control module
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The remote playback device-CD player w/U1S
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The transfer case shift control module
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The transmission control module (TCM) w/Allison Transmission
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The theft deterrent control module
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The vehicle communication interface module (VCIM) w/UE1
Much of the time complaints about CB receive (RX) and modulation are caused by problems in the antenna system. Make sure there are no shorted or open connections in the coaxial cable or PL-259 (screw-on connectors for coaxial cable, located at the antenna and rear of CB radio) connectors. Use your radio's meter or better still, a Power/SWR meter to check the SWR (Standing Wave Ratio) of the antenna. Try to get that as close as possible to a 1:1 ratio on the meter. A shorted or open antenna can keep the receive audio on your radio at very low levels. Plus, this will harm your transmitter if you continue keying the mike.
Another problem can surface in the radio itself. This will be noticed if you can transmit, but have no "modulation". Modulation can be described as the voice heard above the "carrier" (your transmitted signal). Every CBer knows about the term, modulation. The Truckers will definitely inform you about your modulation quality...lol. This problem can be caused by a defective AMC (Automatic Modulation Control) stage in the receiver circuit. Also, there will be no modulation upon transmit.
One other thing could be causing this lack of receive audio. Defective wiring or switching in the microphone can result in no audio. Additionally, in many radios, a missing mike will not allow receive, because the microphone connection completes the RX (Receive) circuit.
Solutions: 1. Check the antenna system, and fix any problems. 2. Check mike, or substitute another one. 3. Using meter, and/or another radio for listening on same channel, check power and receive. 4. You can probably fix 1, 2 and 3 yourself, or with the aid of a friend. 5. AMC problem in radio (as described above) will require professional service from a CB (Citizens Band) repair facility.
The above suggestions and advice will assist in repairing the majority of the symptoms described.
the connector is marked F_audio and it is located directly behind the rear facing audio jacks. should be only one plug either marked "hd audio" OR "ac97 audio". some cases are setup for either, but you only need one of them depending on what your motherboard supports.
11) F_AUDIO (Front Audio Connector)
This connector supports either HD (High Definition) or AC97 front panel audio module. If you wish
to use the front audio function, connect the front panel audio module to this connector. Check the pin
assignments carefully while you connect the front panel audio module. Incorrect connection
between the module and connector will make the audio device unable to work or even damage it.
For optional front panel audio module, please contact your chassis manufacturer.
By default, the audio driver is configured to support HD Audio. To connect an AC97 front panel
audio module to this connector, please refer to the instructions on page 72 about the software
settings.
Pin No. Definition
1 MIC
2 GND
3 MIC Power
4 NC
5 Line Out (R)
6 NC
7 NC
8 No Pin
9 Line Out (L)
10 NC
AC'97 Audio:
Pin No. Definition
1 MIC2_L
2 GND
3 MIC2_R
4 -ACZ_DET
5 LINE2_R
6 FSENSE1
7 FAUDIO_JD
8 No Pin
9 LINE2_L
10 FSENSE2
If there is no transmit at all, it sounds like it wasn't fully refurbished. If it is just low modulation then just turn VR16 and VR14 all the way to the left.
If its not working at all, send it back. It hasn't been refurbished.
sound like the tuner it's self is going bad. Have you checked the antenna connections? Try holding on to the antenna when the radio is fading out. Sadly the radio is part of the stereo and not a separate module. You need a new stereo, get one with HD radio...you'll love it.
First of all removing of radio will definitely give you alot more room. (rememeber you will nee radio code after you unplug radio) I would recommend that you disconnect battery before you EVER work on air bags. This module is pretty simple to remove but it is help by Special TORX screws. after removal of screw it its a yellow latch to pull across and unplug. Good luck thanks for using FIX YA
In the back is where power mods have been added...It sounds like a swing kit 1/2 watt deadkey to 25 watts which is a powerful modulation exceeding 100%. Its a 220uf capacitor in place of a jumper J1 or J(x) J something in some radios. if you replace the jumper and remove the capacitor 220uf or 470uf one.(near finals it will return to around 4 watt dead key) The result of 4 watts is modulation is flat;where if you adjust it to 2 1/4 watt to say 20 watts it will be very loud and modulation is at 100%.
Yes , you need the HD tuner module that connects thru a din cord in the back of the radio. When a device says it is "HD ready" that means that it does not have it, but it can be connected and then used. Always look for that little tell-tale of being "ready". That is the give-away as to if it has it now, or it is only ready for it, meaning that it is compatible.
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