Brand: JVC
Category: Audio System
Document Type: Manual
Language: EN
Available Languages: EN , ES
Manual for KW-R940BTS
Uploaded: Nov. 21, 2025, 9:03 p.m.
Warranty Information
Refer to the supplier's declaration of conformity for warranty details.
Before Use
- Read this manual before use.
- Observe Warnings and Cautions.
- Keep manual in a safe place.
- WARNING: Do not operate functions that distract from driving. Do not ingest batteries (chemical burn hazard).
- CAUTION: Adjust volume to hear outside sounds. Lower volume for digital sources. Avoid external devices hindering safe driving. Back up important data. Never place metallic objects inside the unit.
- KW-R940BTS: Eject disc if condensation occurs. Antenna may extend automatically.
- Remote control (RM-RK52): Do not leave in hot places. Use correct battery type. Avoid extreme temperatures.
Basics
- Faceplate: Learn button layout for KW-R940BTS and KW-X840BTS.
- To turn on/off: Press SOURCE. Hold to turn off.
- To adjust volume: Turn volume knob. Press to mute/pause.
- To select a source: Press SOURCE repeatedly.
- To change display info: Press MENU repeatedly.
- Remote control: Learn button functions. Replace battery by following steps.
Getting Started
- Cancel demonstration: Follow on-screen prompts.
- Set clock and date: Use MENU and volume knob to set clock, date, and format.
- Set basic settings: Access SYSTEM, KEY BEEP, SOURCE SELECT, etc. via MENU.
Troubleshooting and error codes
| Symptom | Solution |
| General | |
| No sound is heard. | • Adjust volume to the optimal level. • Inspect cables and connections. |
| Appears "MISWIRING CHECK WIRING THEN PWR ON". | Turn off the unit, check speaker cable terminals for proper insulation, then turn the unit back on. |
| Appears "PROTECTING SEND SERVICE". | Take the unit to the nearest service center. |
| Source cannot be selected. | Verify the [SOURCE SELECT] setting. (Page 6) |
| Receiver does not operate at all. | Reinitialize the unit. (Page 4) |
| Characters are not displayed correctly. | • This unit only displays uppercase letters, numbers, and limited symbols. • Depending on the selected language, some characters may not display correctly. |
| Radio | |
| Poor radio reception. | Connect the antenna firmly. |
| Static noise while listening to the radio. | |
| CD/USB/iPod | |
| Disc cannot be ejected. | Press and hold to force eject the disc. Be careful not to drop the disc. |
| Noise is generated. | Skip to another track or change the disc. |
| Appears "IN DISC" and the disc cannot be ejected. | Ensure there are no obstacles in the slot when ejecting. |
| Appears "PLEASE EJECT”. | Press , then insert the disc correctly. |
| CD/USB/iPod | |
| Playback order is unexpected. | Playback order is determined by recording sequence or filename. |
| Playback elapsed time is incorrect. | Depends on the previous recording process (disc/USB). |
| Appears "NOT SUPPORT" and tracks are skipped. | Check if the track format is playable. (Page 36, 37) |
| Message "READING" keeps flashing. | Do not use excessive folder hierarchies. Reload disc or reconnect device. |
| Appears "UNSUPPORTED DEVICE". | Check if the USB device is compatible and has a compatible file system. (Page 37) Reconnect USB device. |
| Appears "UNRESPONSIVE DEVICE". | Ensure the USB device is functioning correctly and reconnect it. |
| Appears "USB HUB IS NOT SUPPORTED". | A USB hub cannot be connected to this unit. |
| Appears "CANNOT PLAY”. | Connect a USB device that contains playable audio files. |
| Source does not switch to "USB" when a USB device is connected. | The USB port is drawing more power than its design limit. Turn off the unit, disconnect the USB device, turn on the unit, then reconnect the USB device. If the problem persists, turn the unit on/off or reinitialize it before replacing the USB device. |
| iPod/iPhone does not turn on or function. | Check the connection between the unit and the iPod/iPhone. Disconnect and perform a forced reset of the iPod/iPhone. |
| "LOADING" appears when accessing search mode. | The unit is preparing the iPod/iPhone music list. This may take some time. Try again later. |
| "NO DISC" | Insert a playable disc into the slot. |
| "NO DEVICE" | Connect a USB/iPod/iPhone device and switch to the USB/iPod/iPhone source. |
| "MEMORY FULL" | Maximum storage limit reached on iPod/iPhone. |
| "ADD ERROR" | Failed to create a new station. |
| "CHK DEVICE" | Verify the Pandora application on your device. |
| "NO SKIPS" | Skip limit reached. |
| "NO STATIONS" | No stations found. |
| "STATION LMT" | Maximum registered stations reached. Delete unneeded stations. |
| Pandora | |
| "UPGRADE APP" | Ensure the latest Pandora app version is installed. |
| "CONNECT ERR" | Connection is unstable. |
| "RATING ERR" | Thumb up/down registration failed due to insufficient network connectivity. |
| "THUMBS N/A" | Thumb up/down is not permitted. |
| "LICENSE ERR" | Accessing from a country where Pandora is not available. |
| Spotify | |
| "DISCONNECTED" | USB disconnected from the head unit. Ensure the device is properly connected via USB. |
| "CONNECTING" | Connected via USB: Device is connected. Please wait. Connected via Bluetooth: Bluetooth disconnected. Check connection and ensure pairing. |
| "CHECK APP" | Spotify app not connected or user not logged in. Restart the app and log in. |
| "CH LOCKED LOCK CODE?" | Selected channel is locked. Enter the correct code to unlock. (Page 17) |
| "CHAN UNSUB" | Selected channel not subscribed. Subscribe by calling the provided numbers. (Page 15) |
| "CH UNAVAIL" | Selected channel unavailable. Visit website for more info. |
| "CHECK ANTENNA" | Check antenna and its connection. |
| "CHECK TUNER" | Ensure SiriusXM vehicle tuner is connected. |
| "NO SIGNAL" | Ensure the antenna is mounted outside the vehicle. |
| Radio SiriusXM® | |
| "SUBSCRIPTION UPDATED - PRESS ENTER TO CONTINUE." | Subscription updated. Press volume knob to continue. |
| "CODE ERROR" | Ensure correct access code is entered. (Page 17) |
| "NO CONTENT" | Not enough content for TuneScan. |
| "SCAN CANCEL" | TuneScan canceled. |
| No Bluetooth device detected. | Search for Bluetooth device. Reinitialize unit. (Page 4) |
| Bluetooth pairing is not possible. | • Ensure the same PIN is entered on the unit and device. • Remove pairing information and re-pair. (Page 20) |
| Noise or echo during a phone call. | • Adjust microphone position. (Page 19) • Check [ECHO CANCEL] setting. (Page 22) |
| Poor phone call audio quality. | Reduce distance between unit and Bluetooth device. Move car to area with better signal. |
| Voice dialing does not work. | Use voice dialing in a quiet environment. Reduce distance to microphone. Use the same voice as registered. |
| Bluetooth® | |
| Sound interrupts or is skipped during playback from a Bluetooth audio player. | Reduce distance between unit and Bluetooth audio player. Turn unit off/on and try reconnecting. Other Bluetooth devices may be trying to connect. |
| Bluetooth audio player cannot be controlled. | • Check if the audio player is compatible with AVRCP. (See player's instructions.) • Disconnect and reconnect the Bluetooth player. |
| "PLEASE WAIT" | Unit is preparing to use Bluetooth function. If message does not appear, turn unit off/on and reconnect. |
| "NOT SUPPORT" | Connected phone is not compatible with voice recognition or phonebook transfer. |
| "NO ENTRY"/"NO PAIR" | No registered device connected/located via Bluetooth. |
| "ERROR" | Try again. If "ERROR" reappears, check if the device is compatible with the function being used. |
| "NO INFO"/"NO DATA" | Bluetooth device cannot obtain contact information. |
| "H/W ERROR" | Reinitialize the unit and try again. If "H/W ERROR" reappears, consult service center. |
| "SWITCHING NG" | Connected phones are not compatible with the phone switching function. |
| Bluetooth connection between Bluetooth device and unit is unstable. | Remove unused registered Bluetooth device. (Page 24) |
| AMAZON ALEXA | |
| Alexa does not respond to voice commands. | Amazon cloud could not analyze voice input. |
| Alexa response is incorrect. | Alexa does not understand or capture the request. Try again. (Page 27, 28) |
| "DISCONNECTED" | Ensure smartphone is connected to unit via Bluetooth. (Page 19) |
| Cannot connect or reconnect to the Alexa mobile app. | • Ensure audio device is connected via Bluetooth. Select audio device in [AUDIO SELECT] in [BT MODE]. (Page 24) • Repeat One-Time Setup. See "How to set up for the first time" on page 26. • Turn unit off/on and try connecting again. • On iOS device, ensure ALEXA source or iPod BT source is selected. |