When I have the tuner in FM mode and select Dolby Digital the center channel is the only one that plays

PIONEER VSX-D903S - A/V Receiver
PIONEER CU-VSX079 - Remote

Here's the basics: Make sure your receiver is in the Tuner mode, by selecting Tuner on either the remote (grey button), on the receiver, or from the GUI menu. (The display will also show TUNER.) There are a couple of different ways to tune a station. One method is with the remote. Use the Band button on the remote (or via the GUI display), or the FM/AM button on the receiver, to select the frequency type. Use the Freq/Ch buttons on the remote to tune, the number buttons for presets (30 presets total. Examples: Preset 5, simply press 5; Preset 15, enter 5-5; Preset 25, enter 5-5-5). You can also use the on-screen GUI menu and the remote to tune stations, using the lower grey buttons. If you want to tune directly, via the receiver, press Select, to switch between frequency tuning and presets (displays ST CALL) mode. Use the Multi-Jog dial to make your selection in either mode. The easiest way to program a station into a preset is to use the onscreen GUI menu. [NOTE: The GUI mode (TV Monitor Video Out, composite video) is active when an amber (orange) ring glows around the Multi-Jog dial (the GUI button on the receiver will also glow simultaneously). Use the remote lower grey buttons, or use the Multi-Jog dial and Select, to move the cursor and select commands on the TV. This A/V Receiver handles composite video/S-video, and Stereo/Dolby 3-Channel/Dolby Pro-Logic audio only. (Pre-ATSC/HD video, Pre-Dolby Digital/DTS multi-channel surround audio)]

Green speaker jacks usually mean center channel. The center channel is not used in all surround modes. Make sure you are playing a movie, and have a dolby or prologic surround mode selected.

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You need to use the remote control to access the radio station frequencies.
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Jas247

Hi,
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Hope this helps!
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Product Features and Technical Details

• Dolby Digital, Dolby Pro Logic II, and DTS-decoding home theater receiver with 5 speakers and a powered subwoofer
• 35 watts per channel x 4 "tallboy" speakers, 140 watts for the center channel, and 150 watts for the subwoofer
• High-resolution DVD-Audio playback; JPEG, MP3, and WMA CD playback
• Magnetic shielding for distortion-free placement near a TV or computer monitor
• Includes digital FM/AM tuner and a universal remote control

Technical Details

• Brand Name: Panasonic
• Model: SC-HT900
• Output Wattage: 390
• Component Type: Home theater system
• Audio Output Mode: Surround Sound
• Surround Sound Effects: Super Surround Sound
• DVD Type: DVD changer
• Built In Decoder: Dolby Pro Logic II, Dolby Digital, DTS decoder
• Remote Control Description: Universal remote control
• Optical Digital Input: Yes
• Audio Input: None
• Tuner Technology: Digital
• Radio Bands Supported: AM/FM

Assuming that you mean Dolby digital 5.1, confirm that you have a center channel properly connected and perform the following;

Using the remote, enter the menu on the receiver and navigate to the selection labeled "LEVEL." Toggle through the selections until you reach the "CENTER CHANNEL". You will be able to use the remote to increase the volume of that channel in .5dB increments.

You may have had the receiver set to "Stereo" mode, or Analog instead of "Digital" or "Auto" (automatically switches to digital when it detects a signal) modes. Also, setting it to "Direct" (2-channel from an analog source) could result in loss of center channel. Or your Surround Parameter dial (on the higher-end Denons, at least) could be set to a 2-channel mode.
Finally, if your digital inputs are incorrectly assigned (e.g., COAX1 instead of OPT1, or OPT2 instead of OPT1) for that source, the receiver will use the Analog signal which is stereo-only. You could get a center channel via Dolby Pro Logic II but it would be a "matrixed" signal, not the "real" center channel you could get via digital input using Dolby Digital or DTS.
(If all else fails, re-check your center channel speaker wire connections. It's very unlikely, but also possible, that either the receiver center channel amp or the speaker has failed.)

Set the system to the FM receiver/ Tuner Option. Select the 'mode" button on the remote control. Set the system to the Dolby PL II option. This will engage all the speakers. I had the same issue and this fixed the problem!

try to calibrate the speakers from audessy rom menu,i did it and it lokes like it just needed to register all the channels,hope it helps.

I just read over the problem you were having with your Onkyo TX-SR500 receiver. It sound like the unit needs to be setup for all five channels.Sence your symptom says the diplay shows Dolby D3/2.1. According to the owners manual with the remote control look for speaker setup whin the button is pressed the current speaker setup will be shown in the display. Press the preset/adjustment<> to change the current setting to five speakers. the listening mode will automatically change according to the number of channels you selected. Hope this helps. Radiotech