Pioneer DMH-1770NEX Multimedia Receiver Wiring Diagram
Complete diagram
Every cable and connector on the rear of the unit and where each one goes.
Terminals and components · 23
- Battery +
- Switched 12 V
- Ground
- Signals
- Illumination and preamp
- Speakers
- Video and camera
- Connectors
- Mute
- Antenna and devices
Connection
Plug the vehicle antenna cable in here.
Where to mount it
Where it best picks up the driver's voice; if the cable does not reach the sun visor, mount it on the steering column. Connect it with the unit off (ACC OFF).
Maximum length
Micro USB: up to 2 m; USB-C: up to 4 m. Longer cables may not work properly.
Installation
Follow the tuner's instruction manual.
Cable
Use a mini-jack AV cable: with other cables the contact order may differ and disturb picture and sound.
Colors
White: left audio; red: right audio; yellow: video.
Fuse
The power cord has a 10 A fuse: replace it only with one of the same rating.
No ACC
It cannot be installed in a vehicle without an ACC position on the ignition switch.
Why
The unit knows when the lights are on to dim the display.
Separate screws
The power amp ground and this unit's ground (or other devices) go to the body with different screws. A loose screw can cause smoke, fire or malfunction.
Why
The unit senses whether the car moves forward or backward and shows the rear camera.
Always active
It outputs the signal even if the audio source is off.
Required
This lead must go to the power supply side of the switch, not the ground side.
Caution
Tape any unused speaker leads. With a two-speaker system, do not connect anything to the spare leads.
Impedance
4 to 8 Ω speakers; with an external amp these leads are not used.
Caution
Tape any unused speaker leads. With a two-speaker system, do not connect anything to the spare leads.
Impedance
4 to 8 Ω speakers; with an external amp these leads are not used.
Caution
Tape any unused speaker leads. With a two-speaker system, do not connect anything to the spare leads.
Impedance
4 to 8 Ω speakers; with an external amp these leads are not used.
Caution
Tape any unused speaker leads. With a two-speaker system, do not connect anything to the spare leads.
Impedance
4 to 8 Ω speakers; with an external amp these leads are not used.
Plugs
L = left, R = right. With this connection the speaker leads are not used.
Plugs
L = left, R = right. With this connection the speaker leads are not used.
Plugs
L = left, R = right. With this connection the speaker leads are not used.
Warning
Never install the rear display where the driver can watch video while driving.
Connection
It comes from the connector 1 cable.
Warning
Use it only for a reverse or mirror-image rear view camera; do not connect other equipment.
Automatic view
Shifting into REVERSE switches the screen to the camera automatically (needs the violet/white connected).
Power cord
Battery, ignition, ground, illumination and vehicle signals.
Terminals and components · 7
- Battery +
- Switched 12 V
- Ground
- Signals
- Illumination and preamp
Fuse
The power cord has a 10 A fuse: replace it only with one of the same rating.
No ACC
It cannot be installed in a vehicle without an ACC position on the ignition switch.
Why
The unit knows when the lights are on to dim the display.
Separate screws
The power amp ground and this unit's ground (or other devices) go to the body with different screws. A loose screw can cause smoke, fire or malfunction.
Why
The unit senses whether the car moves forward or backward and shows the rear camera.
Always active
It outputs the signal even if the audio source is off.
Required
This lead must go to the power supply side of the switch, not the ground side.
Speaker leads
The eight leads for the four speakers, with their polarity.
Terminals and components · 4
- Speakers
Caution
Tape any unused speaker leads. With a two-speaker system, do not connect anything to the spare leads.
Impedance
4 to 8 Ω speakers; with an external amp these leads are not used.
Caution
Tape any unused speaker leads. With a two-speaker system, do not connect anything to the spare leads.
Impedance
4 to 8 Ω speakers; with an external amp these leads are not used.
Caution
Tape any unused speaker leads. With a two-speaker system, do not connect anything to the spare leads.
Impedance
4 to 8 Ω speakers; with an external amp these leads are not used.
Caution
Tape any unused speaker leads. With a two-speaker system, do not connect anything to the spare leads.
Impedance
4 to 8 Ω speakers; with an external amp these leads are not used.
External power amp
RCA outputs to the amplifiers and the lead that turns them on. With this connection the speaker leads are not used.
Terminals and components · 6
- Signals
- Illumination and preamp
- Mute
- Antenna and devices
Plugs
L = left, R = right. With this connection the speaker leads are not used.
Plugs
L = left, R = right. With this connection the speaker leads are not used.
Plugs
L = left, R = right. With this connection the speaker leads are not used.
Amp turn-on
Connect it to the system remote (REM) terminal of each amplifier.
Connection
Follow each amplifier's manual.
Camera and video
Rear view camera, external video input and output for a rear display.
Terminals and components · 2
- Video
- Reverse
- External device
Warning
Use it only for a reverse or mirror-image rear view camera; do not connect other equipment.
Automatic view
Shifting into REVERSE switches the screen to the camera automatically (needs the violet/white connected).
Why
The unit senses whether the car moves forward or backward and shows the rear camera.
Cable
Use a mini-jack AV cable: with other cables the contact order may differ and disturb picture and sound.
Colors
White: left audio; red: right audio; yellow: video.
Settings
The unit must be set up to use it.
Warning
Never install the rear display where the driver can watch video while driving.
About This Diagram
These diagrams are redrawn from pages 3–6 of the Pioneer DMH-1770NEX Multimedia Receiver manual, and we offer them completely free and in English. We have also categorized it in the Car Audio & Stereo (Automotive) section on Diagramverse, and it has been rated by 1 user with an average rating of 5.0. If you have any specific questions about the Pioneer DMH-1770NEX Multimedia Receiver Wiring Diagram, we suggest checking the Frequently Asked Questions (FAQs) section.
Printable Pioneer DMH-1770NEX Wiring Diagrams
Wiring Instructions
Before you start
The Pioneer DMH-1770NEX receiver is built for professional installation. If you are not comfortable working with vehicle wiring, airbags or dash panels, have a trained mobile electronics installer do the job. Check two things about the vehicle first. It must have a 12 V negative ground electrical system, and its ignition switch must have an ACC (accessory) position. If either is missing, do not install this unit.
If the vehicle already has a factory backup camera that meets U.S. or Canadian rear visibility rules, the new receiver has to show that same camera view. This usually needs a vehicle-specific adapter, sold separately. Talk to a professional installer before you remove the factory radio.
Choose the diagram tab that matches your job:
- Power and Speakers: a basic install that uses the receiver's built-in amplifier.
- Power amp: you are adding external amplifiers through the RCA outputs.
- Camera and video: choose Rear camera for a backup camera, or AV video and rear display for an external video source or a rear-seat screen.
- Complete: shows everything together.
Tools and materials: a digital multimeter, wire strippers, a crimp tool with insulated butt connectors or a vehicle-specific harness adapter, electrical tape, cable clamps and the supplied mounting screws. The sources don't give a wire gauge for extensions. If you have to extend a lead, use wire at least as heavy as the original lead. Never shorten the receiver's leads, because that can stop the built-in protection circuit (fuse holder, fuse resistor or filter) from working properly.
Before you touch any wiring, disconnect the negative (–) battery cable. This prevents short circuits while you work.
Step-by-step wiring
- Plan the mounting location. The unit mounts to the factory radio-mounting bracket with three screws on each side, using only the supplied 5 mm × 9 mm screws. Mount it within 0 to 60 degrees of horizontal and leave about 5 cm of free space behind it for cooling.
- Connect Black: ground first, to bare metal of the vehicle body. If you are also installing an external power amp, ground the amp with its own separate screw, never the same one.
- Connect Yellow: battery + to a circuit that has 12 V at all times. Do not run it straight to the battery terminal. Engine vibration can wear through its insulation where it passes into the engine compartment, and that causes a dangerous short.
- Connect Red: ACC (switched 12 V) to a circuit that only has 12 V when the key is in ACC or ON.
- Connect Orange/white: illumination to the lighting switch terminal so the screen can dim when the headlamps are on.
- Connect Light green: parking brake to the power supply side of the parking brake switch, not the ground side. Never bypass or tamper with this connection.
- If you have a rear camera, connect Violet/white: reverse signal to whichever of the two backup lamp wires changes voltage when the shifter is in REVERSE (R).
- Wire the four speakers, keeping the + and − leads correct on every channel. Use 4 to 8 Ω speakers rated over 50 W maximum input. With only two speakers, leave the unused speaker leads unconnected and tape each one separately.
- If you are using external amplifiers, run RCA cables from FRONT OUT, REAR OUT and/or SUB OUT. Connect Blue/white: system remote to the amp's remote terminal. This lead supplies 300 mA maximum at 12 V DC. If the amps drive all of your speakers, leave the receiver's speaker leads unused and taped.
- Connect Yellow/black: audio mute only to the mute lead of equipment that has a mute function. Otherwise, tape it and leave it free.
- Plug in the accessories:
- the antenna to ANT
- the rear camera's video output to Brown: rear view camera input (camera only)
- an external video component to AUX IN, using a mini-jack AV cable
- a rear-seat display to REAR MON
- the SiriusXM tuner to SXM, using the supplied cable
- a steering wheel adapter to Steering
- Connect the microphone with the unit off. Mount it on the sun visor, which must be in the up position, or on the steering column away from the wheel. Route the USB cable to a place where the phone can be secured.
- Insulate every unused lead. Secure all wiring with clamps or tape, and keep it clear of the steering column, shift lever, pedals, seat tracks, doors and hot surfaces.
Testing and start-up
Do a temporary test before you fasten the unit into the dash. Reconnect the negative battery cable, then check:
- Key off: Yellow should read about 12 V to ground and Red should read about 0 V.
- Key in ACC: Red and Blue/white should both read about 12 V.
The unit is rated at 14.4 V DC and accepts anywhere from 10.8 V to 15.1 V. It has a 10 A fuse. Next, turn the ignition off and press RESET with a pen tip. Reset is required before first use after installation.
Turn the key to ACC and confirm the following:
- Every speaker plays. Use the fader and balance controls to check each channel on its own.
- The radio receives stations.
- Video is only available with the parking brake applied.
- The screen switches to the camera image as soon as you shift into REVERSE (R). Turn on Back-up Camera Input in the camera settings first.
- If you use a subwoofer, enable it under Cutoff in the audio settings.
Safety notes
- Never tap into the receiver's power leads to feed other devices. You will exceed their current capacity and the leads will overheat.
- Replace the fuse only with one of the rating marked on the unit.
- Never use 1 to 3 Ω speakers on this receiver.
- Never mount the unit, or any rear display, where it blocks the driver's view, interferes with an airbag deployment zone, or lets the driver watch video.
- Do not open the unit. It contains high-voltage parts.
Troubleshooting
| Symptom | Probable Cause | What to Check |
|---|---|---|
| Unit won't turn on at all | Blown 10 A fuse, poor ground, or no 12 V on Yellow or Red | Check the fuse. With the key in ACC, measure Yellow and Red to bare chassis: both should read about 12 V. Clean and tighten the Black ground screw. |
| Clock, presets and settings are lost every time I turn off the car | Yellow is on a switched circuit, or Yellow and Red are swapped | With the key off, Yellow must still read about 12 V and Red about 0 V. Move the leads to the correct circuits. |
| Car battery goes dead overnight | Red is on a constant 12 V circuit, so the unit never fully shuts off | With the key removed, measure Red. It should read 0 V. If it shows 12 V, move Red to a circuit that is only live in ACC. |
| Screen shows a caution message and video won't play | Light green is not connected, is on the wrong side of the switch, or the parking brake is off | Make sure Light green goes to the power supply side of the parking brake switch. Stop the car, apply the brake, release it and apply it again. |
| Screen doesn't switch to the camera when I shift into reverse | Back-up Camera Input is off, the Brown RCA is loose, or Violet/white is on the wrong backup lamp wire | Turn on Back-up Camera Input. Reseat the camera RCA in the Brown input. Check that Violet/white is on the backup lamp wire that changes voltage in REVERSE (R). |
| Black screen in reverse, and I have no camera | Back-up Camera Input is set to on | Turn Back-up Camera Input off in the camera settings. |
| Caution! AMP Overload message, or no sound from the speakers | A shorted speaker lead, a bare lead touching metal, or speakers below 4 Ω | Check every speaker pair for shorts or chafing and tape unused leads separately. Confirm each speaker is 4 to 8 Ω. Then turn off ACC, wait at least 9 seconds and turn it back on. |
| Thin, weak bass, or sound seems to come from the wrong place | The + and − speaker leads are reversed on one or more speakers | Check that White, Gray, Green and Violet go to + and that each matching black-striped wire goes to −. |
| External amplifier never turns on | Blue/white is not connected, or the amp's ground is bad | With ACC on, measure Blue/white at the amp's remote terminal: you should see about 12 V. Check that the amp has its own ground screw on bare metal. |
| Subwoofer is silent | Subwoofer output is disabled, or the RCA cable is in the wrong jack | Enable Subwoofer under Cutoff in the audio settings. Make sure the cable is in SUB OUT, not FRONT OUT or REAR OUT. |
| Screen stays bright at night, or never dims | Orange/white is not on the lighting switch circuit, or Lighting Detect is off | With the headlamps on, measure Orange/white: it should read about 12 V. Turn on Lighting Detect in the display settings. |
| Check Antenna, Check Tuner or Caution! USB Overcurrent message | A loose antenna plug, a bad SiriusXM tuner connection, or a faulty USB device or cable | Reseat the plug in ANT, reconnect the tuner at SXM and check the battery voltage. For USB, try a different cable, then cycle ACC off and on. |
