Start by disconnecting the negative terminal from the battery–this prevents accidental short circuits while handling the harness. The factory sound system in this model uses a 16-pin connector (part #68051291AA) behind the dashboard, typically located on the left side near the fuse box. Pin assignments follow a standard configuration: pins 1-4 handle speaker outputs (front left, front right, rear left, rear right), while pins 5-8 manage power and ground. Verify continuity with a multimeter before splicing any new components.
Color codes matter: the harness wires adhere to a specific scheme–solid orange delivers constant 12V, dark green with orange stripe carries switched power, and black with light blue stripe is the primary ground. Misidentifying these will cause permanent damage to the head unit or amplifiers. If integrating an aftermarket system, use a bypass module (e.g., Metra ASWC-1) to retain steering wheel controls; direct splicing often disables safety protocols like chime warnings.
For vehicles equipped with the premium Infinity system, four additional wires (pins 9-12) connect to the amplifier, usually mounted behind the rear passenger panel. These are distinguished by thicker gauge and a twisted-pair configuration to reduce interference. Avoid cutting these–use a T-harness adapter (e.g., Scosche JP14) to preserve factory tuning. Test all connections with the ignition in the “ACC” position before finalizing the install; a single loose wire can trigger error codes in the body control module.
If troubleshooting no-sound issues, focus on the fuse labeled “RADIO” in the interior fuse box–this 15A fuse powers both the unit and antenna motor. Check the 18-gauge pink wire for voltage at the back of the head unit; lack of power here points to a break in the harness between the fuse box and dashboard. For persistent grounding issues, clean the mounting point behind the unit with a wire brush–corrosion here mimics a dead amplifier.
When upgrading speakers, note that the front door tweeters (6.5″ coaxial) require a 4-ohm load; exceeding this causes the factory amplifier to overheat. Rear soundbar speakers (6″x9″) share a common positive wire, so balance trims via the head unit menu to avoid phase cancellation. If adding a subwoofer, tap into the purple/white wire at the amplifier for a low-level signal–this avoids overloading the speaker outputs.
Off-Road Audio System Connection Guide for the 2014 Model Year SUV
Begin by locating the factory harness behind the dashboard center console–it’s secured with a white or grey plastic clip. Disconnect the battery negative terminal before handling any electrical components to prevent short circuits. Use a 16-pin Metra 70-1002 harness adapter for direct compatibility; it maps speaker outputs without splicing. If retaining the OEM amplifier, ensure the aftermarket unit supports preamp signals (minimum 2V RCA) to avoid signal distortion.
- Constant 12V (B+) Wire: Yellow cable in the OEM plug–connects to the vehicle’s fused ignition line for memory retention.
- Switched 12V (ACC): Red wire–energizes only when the key is in the ON or accessory position.
- Ground (GND): Black wire–secure to a bare metal chassis point with a 10-gauge ring terminal for stable reference.
- Front Speakers: Grey (positive) and grey/black (negative) for the passenger side; white and white/black for the driver side–match polarity exactly.
- Rear Speakers: Purple (positive) and purple/black (negative) for the right; green and green/black for the left–verify impedance (4Ω typical).
For vehicles equipped with a Uconnect system, the antenna lead (pink wire) carries both power and signal–use a Metra 40-VW5 antenna adapter to maintain AM/FM functionality. If installing a subwoofer, splice the blue/white remote turn-on wire to the aftermarket amplifier’s remote input; this activates the amp only when the stereo is powered. Avoid tapping into the vehicle’s lighting circuit for this purpose–it risks overloading the fuse box.
Test each connection with a multimeter before finalizing the installation. Set the meter to DC voltage (20V range) and probe the speaker wires while playing a 1kHz test tone; expect 10-12V peak-to-peak for proper operation. If voltage drops below 8V, inspect the ground connection or check for corroded terminals–clean with 600-grit sandpaper and dielectric grease. For steering wheel control compatibility, install a PAC RP4-CH11 interface module; program it via the button sequence outlined in the module’s instructions.
- Disconnect the battery’s negative terminal.
- Remove the center dash bezel–pry carefully with a trim tool to avoid cracking.
- Unplug the OEM connector from the back of the head unit.
- Attach the Metra harness to the vehicle’s harness.
- Connect the Metra harness to the new stereo’s wiring harness.
- Secure the stereo in the dash kit using spring clips or screws, depending on the kit.
- Reconnect the battery and test all functions before reassembling the dash.
If the factory amplifier is bypassed, rewire the speaker outputs directly to the new unit. Use crimp connectors or solder and heat-shrink tubing for secure joints–twist-and-tape methods degrade over time. For dual-zone systems, retain the OEM amplifier and route preamp outputs from the aftermarket unit to the amp’s RCA inputs; failure to do so results in no sound from rear speakers. Check the fuse rating on the new unit (typically 10A) and match it to the vehicle’s fuse box using an add-a-circuit adapter if necessary.
Common pitfalls include reversing speaker polarity or mismatching impedance. A reversed connection causes phase cancellation, creating weak or muffled sound. Verify impedance with an ohmmeter; most aftermarket speakers are 4Ω, while some premium units require 2Ω–consult the stereo and speaker manuals before pairing. For vehicles with a navigation system, retain the GPS antenna connection (teal wire) to maintain satellite functionality. If issues persist, use a wiring block diagram specific to the trim package–Unlimited Sport models include additional wires for rear entertainment systems.
How to Pinpoint the Right Electrical Connector for Your Off-Road Vehicle’s Audio System
Begin by locating the OEM connector behind the factory stereo unit–typically a 10-to-16 pin plug with distinct color-coding. Brands like Metra, Scosche, and PAC provide aftermarket harnesses designed to interface seamlessly with these original connections without splicing. Verify the harness part number against your vehicle’s trim level, as Uconnect-equipped models often require additional adapters for microphone or steering wheel controls.
If dealing with a base model, confirm whether the harness includes provisions for amplifier integration. Some vehicles route audio through an external amplifier, identifiable by a separate 8-to-12 pin connector near the glove compartment or under the dashboard. Failure to account for this will result in distorted sound or complete audio failure in the rear speakers.
Check the harness documentation for compatibility with auxiliary inputs or satellite radio. Aftermarket units may need a separate RCA adapter or a dedicated power wire (typically yellow, 12-gauge) to handle higher current demands. Ignoring this step risks voltage drop, leading to poor performance in subwoofers or amplifiers.
- Match the harness’s pinout diagram to your vehicle’s manual–focus on:
- Constant 12V (yellow) – always-on power for memory retention
- Switched 12V (red) – activates with ignition
- Ground (black) – ensures clean signal transmission
- Illumination (orange or orange/white) – dims display with headlights
- Speaker wires (front/rear pairs, often gray, white, purple, green)
For vehicles with navigation or backup cameras, seek a harness that retains these functions. Some aftermarket kits omit the reverse signal wire (violet/white), forcing manual re-wiring. Use a multimeter to test continuity if the original connector’s labels are unclear–incorrect wiring can trigger error codes in the onboard computer.
Avoid universal harnesses unless they explicitly list your model’s compatibility. Generic connectors often require cutting and crimping, introducing potential weak points in the circuit. Instead, opt for model-specific kits with pre-terminated ends, reducing installation time and minimizing signal interference.
Before finalizing the purchase, inspect the harness for auxiliary outputs like USB or Bluetooth, which may require additional wiring looms. If integrating a non-factory amplifier, ensure the harness includes a remote turn-on lead (usually blue/white) to synchronize power delivery with the head unit.
Step-by-Step Guide to Finding the Audio System Harness Behind the Instrument Panel
Disconnect the negative battery terminal to eliminate electrical hazards before touching any internal components. Locate the trim panel beneath the climate controls by pressing firmly along its edges to release concealed clips–start from the lower left corner and work clockwise to avoid damaging the plastic. Use a non-marring pry tool to separate the panel, exposing the mounting screws securing the head unit.
Remove the two screws or bolts holding the entertainment module in place, typically positioned at the top corners. Gently pull the assembly outward, disconnecting the antenna lead first–press the release tab while wiggling it free to avoid bending the connector. Behind the unit, you’ll find the primary harness: a bundle of multicolored wires terminating in a rectangular plug. Trace the harness upward to confirm it routes through the dashboard’s metal framework before proceeding.
If the connector isn’t immediately visible, check the left side of the cavity where a secondary harness may be tucked behind a foam insulator. Shine a flashlight along the firewall; the plug often hides near the HVAC ductwork. For models with a subwoofer, verify the power feed isn’t tangled with speaker wires–these are thicker and terminate in spade connectors.
Reattach everything in reverse order: align the harness plug, press until it clicks, then secure the head unit with screws before snapping the trim panel back. Reconnect the battery last, then test all functions–volume, tuning, and auxiliary inputs–to ensure no wires were pinched during reassembly.