PIONEER DMH-1770NEX INSTALLATION MANUAL

Important Safety Information

⚠️ WARNING

Rear visibility systems (backup cameras) are required in certain new vehicles in the U.S. and Canada. Owners of vehicles equipped with compliant rear visibility systems should not install or use this product in a way that alters or disables that system's compliance with applicable regulations. If unsure about your vehicle's system, contact the manufacturer or dealer.

If your vehicle has a factory backup camera, do not use the Pioneer receiver unless it displays the same view. Connection may require a separate adapter. Not all vehicles may be compatible.

Important Safeguards

⚠️ WARNING

Pioneer recommends professional installation only by authorized service personnel. Never service this product yourself, as it may expose you to electric shock or other hazards, and can cause damage not covered by warranty.

Precautions Before Connecting the System

⚠️ WARNING

Do not tamper with or disable the parking brake interlock system. Doing so could result in serious injury or death.

❗ CAUTION

• Secure all wiring with cable clamps or electrical tape. Ensure no bare wiring is exposed.
• Do not connect the yellow lead directly to the vehicle battery. Engine vibration may cause insulation failure, leading to short circuits.
• Ensure cables do not become wound around the steering column or shift lever, or interfere with moving vehicle parts (steering wheel, shift lever, parking brake, seats, doors, controls).
• Route wires away from high temperatures to prevent insulation damage, short circuits, or permanent product damage.
• Do not shorten leads, as this may impair the protection circuit (fuse holder, etc.).
• Never power other electronic products by cutting into this product's power supply lead, as it can exceed current capacity and cause overheating.

Before Installing This Product

• Use this unit with a 12-volt battery and negative grounding only. Failure to do so may result in fire or malfunction.
• To avoid electrical shorts, disconnect the negative (-) battery cable before installation.

To Prevent Damage

⚠️ WARNING

• When using 4-channel speaker output, use speakers rated over 50 W (max input power) and with 4 Ω to 8 Ω impedance. Do not use 1 Ω to 3 Ω speakers.
• The black cable is ground. Connect the ground wire first when installing this unit or a power amp. Ensure it's properly connected to the vehicle's metal body. Ground wires for the power amp and this unit/other devices must be connected separately with different screws. Loose ground screws can cause fire or malfunction.

When replacing the fuse, use only the prescribed rating.

This product requires a vehicle with an ACC (accessory) position on the ignition switch.

To avoid short-circuiting, cover disconnected leads with insulating tape, especially unused speaker leads.

The symbol --- on the product indicates direct current.

Precautions

Do not operate this product, applications, or optional rear view camera if it distracts from safe driving. Always obey traffic laws. If you experience difficulty, pull over, park safely, and apply the parking brake before making adjustments.

Do not install where it may:

• (i) obstruct the driver's vision,
• (ii) impair vehicle safety systems (airbags, hazard lights), or
• (iii) impair the driver's ability to operate the vehicle safely.

Installation may not be possible due to vehicle type or interior shape.

Notice for the Blue/White Lead

When the ignition switch is turned ON (ACC ON), a control signal is output through the blue/white lead. Connect this to the system remote control terminal of an external power amp, auto-antenna relay control terminal, or antenna booster power control terminal (max. 300 mA 12 V DC). This signal is output even if the audio source is off.

This Product (Connectors)

Diagram shows the rear panel of the product with various connectors:

• Microphone (3 m / 9 ft. 10-1/8 in.)
• Antenna jack
• Connector 1 (REAR VIEW CAMERA IN / MUTE / STEERING WHEEL CONTROL)
• Connector 2 (AUX IN)
• Pre out supply
• SiriusXM Connect Vehicle Tuner connection (requires separate SiriusXM cable).

Power Cord

Diagram shows power cord connections:

• To power supply (constant power, yellow wire)
• To ignition switch (12 V DC ON/OFF, red wire)
• To lighting switch terminal (orange/white wire)
• To ground (black wire, connected to vehicle's metal body)

Speaker Leads

Diagram shows connections for front and rear speakers (Left/Right).

• To power supply
• Power cord
• Left speaker leads
• Right speaker leads
• Front speaker leads
• Rear speaker leads

Note: With a two-speaker system, do not connect anything to unused speaker leads.

Power Amp (Sold Separately)

Diagram shows connections for an external power amplifier:

• Subwoofer output (SUBWOOFER OUT L/SUBWOOFER OUT R)
• RCA cable (sold separately)
• Power amp connection
• Front output (FRONT OUT L/FRONT OUT R)
• Rear output (REAR OUT L/REAR OUT R)
• Yellow/black (MUTE) wire: Connect to audio mute function if available, otherwise leave unconnected.
• Pre out cord
• To pre out supply
• To connector 1
• System remote control (connect to blue/white cable)
• Rear speaker output
• Front speaker output

? NOTE: Speaker leads are not used when this connection is in use.

iPhone and Smartphone Connectivity

Connecting via USB Port:

• iPhone with Lightning Connector: Connect iPhone using a USB interface cable (sold separately) and a USB cable (1.5 m / 4 ft. 11 in.) to the USB port.
• Smartphone (Android™ Device): Connect smartphone using a USB-micro USB cable (Type A to micro B, sold separately) or USB Type-C cable (Type A to USB C, sold separately) and a USB cable (1.5 m / 4 ft. 11 in.) to the USB port.

? NOTE: USB cable length limitations apply (Type A-micro B max 2m, Type A-USB C max 4m). Android is a trademark of Google LLC.

Camera

About Rear View Camera:

When the shift lever is moved to REVERSE (R), the rear view image automatically switches from the video source. Camera View mode allows checking behind the vehicle while driving.

⚠️ WARNING

Use this input ONLY for REVERSE or MIRROR IMAGE REAR VIEW CAMERA. Other use may result in injury or damage.

❗ CAUTION

• The screen image may appear reversed.
• Use the rear view camera for parking or observing trailers, not for entertainment.
• Objects in the rear view may appear closer or more distant than in reality.
• The image area may differ slightly.

? NOTES: Connect only the rear view camera to REAR VIEW CAMERA IN. Some settings may be required; refer to the Operation Manual.

External Video Component and Display

Diagram shows connections for external video components and displays.

• This product
• Pre out supply
• Connector 2
• To connector 2
• To pre out supply
• Pre out cord
• Mini-jack AV cable (sold separately)
• AUX input (AUX IN)
• Yellow (REAR MONITOR OUT)
• Yellow (to video input)
• Red, white (to audio outputs)
• RCA cables (sold separately)
• To video input
• Rear display with RCA input jacks
• To video output
• To audio outputs
• External video component (sold separately)

? NOTE: Appropriate settings are required for external video components; refer to the Operation Manual.

⚠️ WARNING

NEVER install the rear display where the driver can watch video while driving. The rear video output is for passengers.

❗ CAUTION

Use a mini-jack AV cable for wiring. Other cables may cause image and sound distortion.

Connection Key: L: Left audio (White), R: Right audio (Red), V: Video (Yellow), G: Ground.

Precautions Before Installation

❗ CAUTION

Never install this product where it could:

• Injure occupants during sudden stops.
• Interfere with driver operation (e.g., on the floor, near steering wheel/shift lever).

Use supplied parts as specified. If using aftermarket parts, ensure compatibility is checked by your dealer. Using incompatible parts may damage the product or cause it to detach.

Do not install where it may:

• (i) obstruct driver's vision,
• (ii) impair vehicle safety systems (airbags, hazard lights), or
• (iii) impair the driver's ability to operate safely.

Never install near airbag deployment zones (dashboard, door, pillar). Refer to your vehicle's owner's manual.

Before Installing

• Consult your dealer if drilling or modifications are required.
• Temporarily connect wiring to confirm correct connections and system operation before final installation.

Installation Notes

• Avoid locations with high temperatures, humidity, direct sunlight, or rain (near heaters, vents, conditioners, dashboard tops, floors, doors).
• Install horizontally with 0 to 60 degrees tolerance.
• Leave ample space behind the unit for heat dispersal and keep cables from blocking vents.

Diagram shows leaving 5 cm space behind the unit.

Installation Using Screw Holes on the Side of This Product

1. Fasten the product to the factory radio-mounting bracket.

Align screw holes and tighten screws at three locations on each side. Use supplied truss head or flush surface screws (5 mm x 9 mm).

TIP: The unit's protrusion can be adjusted by shifting screw hole positions on the bracket.

Diagram shows the factory radio-mounting bracket, dashboard/console, and screws.

Installing the Microphone

• Install where its direction and distance from the driver optimize voice pickup.
• Turn off the product (ACC OFF) before connecting the microphone.
• If the cable is too short for sun visor mounting, install on the steering column.

Mounting on the Sun Visor

1. Fit the microphone lead into the groove.

2. Attach the microphone clip to the sun visor.

Diagram shows fitting the lead into a groove and attaching the clip to the sun visor.

Note: Install when the sun visor is in the up position; it cannot recognize voice if down.

Installation on the Steering Column

1. Detach the microphone base from its clip by sliding the base while pressing the tab.

2. Mount the microphone on the steering column.

Diagram shows detaching the microphone base and mounting it on the steering column.

NOTE: Install the microphone on the steering column, away from the steering wheel.

Adjusting the Microphone Angle

The microphone angle can be adjusted.

Diagram shows the adjustable microphone angle.