Brand: PIONEER
Category: Stereo Receiver
Document Type: Manual
Language: EN
Available Languages: EN , ES
Manual for DEH-3400UB
Uploaded: Nov. 21, 2025, 7:22 p.m.
Warranty Information
The warranty period for this product is 24 months.
Operating this unit
Basic Operations
- Removing the front panel: Press the detach button and push the front panel upward and pull it toward you.
- Re-attaching the front panel: Slide the front panel to the left, then press the right side until it is firmly seated.
- Turning the unit on: Press SRC/OFF.
- Turning the unit off: Press and hold SRC/OFF.
- Selecting a source: Press SRC/OFF to cycle through TUNER, CD, USB/iPod, AUX.
- Adjusting the volume: Turn M.C.
Tuner
- Selecting a band: Press BAND/ until the desired band is displayed.
- Recalling preset stations: Press ◄ or ►.
- Manual tuning: Press ◄ or ►.
- Seeking: Press and hold ◄ or ►, then release.
CD/CD-R/CD-RW and USB storage devices
- Playing a CD/CD-R/CD-RW: Insert the disc.
- Ejecting a CD/CD-R/CD-RW: Press ▲.
- Playing songs on a USB storage device: Open the USB port cover, plug in the device.
- Stopping playback: Disconnect the USB storage device.
iPod
- Playing songs on an iPod: Open the USB port cover, connect an iPod.
- Selecting an album: Press 1/ or 2/V.
Advanced operations
- Repeat play: Press 6 to select repeat range (ALL, ONE, FLD).
- Random play: Press 5/ to turn random play on or off.
- Pause: Press 4/PAUSE.
- Sound retriever: Press 3/S.Rtrv to enhance audio.
Function settings
- Access the main menu by pressing M.C. Navigate to FUNCTION to adjust settings like REPEAT, SHUFFLE, LINK PLAY, PAUSE, AUDIO BOOK, S.RTRV.
Audio adjustments
- Access the main menu by pressing M.C. Navigate to AUDIO to adjust FAD/BAL, PRESET EQ, TONE CTRL, LOUD, SUB.W, SLA.
Initial settings
- Press and hold SRC/OFF until the unit turns off, then press SRC/OFF again to access the initial settings menu. Adjust CLOCK SET, CLOCK, FM STEP, AUTO-PI, AUX, USB PNP, REAR-SP, PREOUT, DEMO, SCROLL, TITLE, PW SAVE.
Illumination color settings (DEH-3400UB only)
- Press COLOR to select KEY COLOR, DISP COLOR, or BOTH COLOR. Customize colors using R, G, B values.
Dimmer setting
- Press and hold the dimmer button to adjust brightness.
Using an AUX source
- Insert the stereo mini plug into the AUX input jack and select AUX as the source using SRC/OFF.
Sound muting
- Mutes automatically during cell phone calls or when Pioneer navigation unit provides voice guidance.
Troubleshooting and error codes
| Symptom | Cause | Action |
| The display illumination turns on and off at random. | Demo mode is on. | Turn off the demo display setting. |
| The display automatically returns to the ordinary display. | You did not perform any operation within about 30 seconds. | Perform operation again. |
| Operating the unit in conditions other than those specified could result in fire or malfunction. | Use only with 12-volt batteries and negative grounding. Use only with speakers rated at 50W and 4 to 8 ohm impedance. Disconnect the battery's negative terminal before installation. Secure wiring with clamps or tape. Keep cables away from moving parts and hot areas. Do not shorten cables. Do not cut power cable insulation to share power. Use the prescribed fuse rating. Never wire the negative speaker cable directly to ground. Never band together negative cables of multiple speakers. | |
| The repeat play range changes unexpectedly. | Depending on the repeat play range, the selected range may change when another folder or track is being selected or during fast forwarding/reversing. | Select the repeat play range again. |
| A subfolder is not played back. | Subfolders can not be played back when FLD (folder repeat) is selected. | Select another repeat play range. |
| NO XXXX appears when a display is changed (NO TITLE, for example). | There is no embedded text information. | Switch the display or play another track/file. |
| Message | Cause | Action |
| ERROR-07, 11, 12, 17, 30 | The disc is dirty. | Clean the disc. |
| ERROR-07, 10, 11, 12, 15, 17, 30, A0 | The disc is scratched. | Replace the disc. |
| ERROR-15 | There is an electrical or mechanical error. | Turn the ignition switch OFF and back ON, or switch to a different source, then back to the CD player. |
| ERROR-23 | The inserted disc is blank. | Replace the disc. |
| FRMT READ | Unsupported CD format. | Replace the disc. |
| FRMT READ | Sometimes there is a delay between the start of playback and when you start to hear any sound. | Wait until the message disappears and you hear sound. |
| NO AUDIO | The inserted disc does not contain any playable files. | Replace the disc. |
| SKIPPED | The inserted disc contains DRM protected files. | Replace the disc. |
| PROTECT | All the files on the inserted disc are embedded with DRM. | Replace the disc. |
| N/A USB | The USB device connected is not supported by this unit. |
|
| CHECK USB | The USB connector or USB cable has short-circuited. | Check that the USB connector or USB cable is not caught in something or damaged. |
| CHECK USB | The connected USB storage device consumes more than 500 mA (maximum allowable current). | Disconnect the USB storage device and do not use it. Turn the ignition switch to OFF, then to ACC or ON and then connect only compliant USB storage devices. |
| CHECK USB | The iPod operates correctly but does not charge. | Make sure the connection cable for the iPod has not shorted out (e.g., not caught in metal objects). After checking, turn the ignition switch OFF and back ON, or disconnect the iPod and reconnect. |
| ERROR-19 | Communication failed. | Perform one of the following operations.
|
| ERROR-23 | iPod failure. | Disconnect the cable from the iPod. Once the iPod's main menu is displayed, reconnect the iPod and reset it. |
| ERROR-16 | Outdated iPod firmware version. | Update the iPod version. |
| STOP | There are no songs in the current list. | Select a list that contains songs. |
| NOT FOUND | No related songs. | Transfer songs to the iPod. |