Start by locating the connector behind the OEM sound unit. Pinouts for the main harness typically follow this layout: Pin 1 (yellow) delivers constant 12V, Pin 2 (red) supplies switched power via the ignition, Pin 3 (black) grounds the circuit securely to the chassis, and Pin 4 (orange) carries dimmer control for automatic illumination adjustments. Verify each wire with a multimeter–continuity between ground and Pin 3 should read 0Ω, while ungrounded pins must show no connection. Misaligned connections risk shorting the fuse box or triggering error codes in the CAN bus.
Antenna power (blue-white) is usually integrated into the same harness, requiring activation via the dash module. If replacing the unit, ensure the aftermarket adapter mirrors these voltages–any mismatch will disable satellite reception or premium amplifier functions. Factory amplifiers rely on gray (front left), gray-black (front right), dark green (rear left), and white (rear right) speaker wires. Strip 5mm of insulation, crimp RCA-grade connectors, and secure with heat shrink to prevent corrosion. Avoid twisting strands, as this increases resistance and distorts audio at higher volumes.
For harnesses with integrated PAC or Metra kits: confirm the retained accessory power (purple) is spliced correctly–this retains presets during battery disconnect. Steering wheel controls send resistance-based signals; use a load simulator or bypass resistor pack if retrofitting. Check harness compatibility before soldering–*some models* route microphone signals through the mirror assembly, requiring additional connectors. Always disable the fuse for the sound system before servicing to prevent airbag deployment errors or reset procedures.
Data links (green, green-white) require termination to the CAN interface. Leave these lines unterminated only if the new unit lacks navigation or hands-free features. AM/FM signals (pink) should be routed away from high-current cables to reduce interference. Final testing: play a 1kHz test tone at 50% volume through all channels–each should output identical decibel levels without phase cancellation.
Electrical Guide for 2014MY Sedan Audio System Connections
Begin by locating the 16-pin ISO connector behind the factory head unit. Pin assignments differ slightly between base and premium sound systems–verify yours using a multimeter before proceeding. The leftmost brown wire (C1) carries constant 12V power, critical for memory retention; secure it to a fused circuit if replacing the stereo.
- C2 (red): Switched power–activates with ignition.
- C3 (black): Ground–ensure minimal resistance to chassis.
- C4 (purple): Illumination control–dimmed via dash lights.
- C5 (gray): Mute input–bridged to parking brake for security features.
For amplified setups, trace the thicker orange harness beneath the glove box. Two 22-gauge orange/yellow wires deliver amplified signal to rear door speakers; test for 4-6V with audio playing. Factory subwoofers use a separate 8-pin mini connector–pinout mirrors standard RCA color codes but requires 80Ω impedance matching for aftermarket units.
Adapter harnesses simplify upgrades but introduce potential failure points. Measure voltage drop across each connection point–exceeding 0.1V necessitates soldering or crimping with heat-shrink tubing. Common pitfalls include reversed polarity on C8 (blue/white antenna trigger) and inadequate grounding on C12 (brown/tan speed-sensitive volume compensation).
Audio interfaces vary by trim level: SE models feature a single-DIN slot with a detachable faceplate, while R/T trims include a 6.5” touchscreen with CAN bus integration. For navigation-equipped units, retain the original GPS antenna (thin coaxial cable ending in an MMCX connector) to preserve satellite functionality. Avoid splicing this wire–use a coupler rated for 50Ω impedance.
- Disconnect negative battery terminal before working.
- Label all removed connectors with masking tape.
- Use dielectric grease on new connections.
- Verify speaker continuity with a 1kHz test tone.
- Recheck fuse ratings against OEM specifications.
Aftermarket amplifiers require dedicated wiring: route 4AWG power cable from battery to trunk, maintaining separation from signal cables. Factory tweeters receive high-pass filtered signals via C14 (violet) and C15 (gray/violet) wires–retain these for balanced tonal output unless upgrading crossover networks. Terminate all unused wires with insulated caps to prevent short circuits.
Finding the OEM Audio Connector in Your Sedan
Disconnect the negative battery terminal first–this prevents short circuits while handling live circuits. The primary harness sits behind the center dash trim, accessed by prying off the climate control bezel with a non-marring tool. Two securing clips (one on each side) release the trim panel; pull slowly to avoid breaking tabs. Beneath the panel, the twelve-pin connector is clipped into a mounting bracket–gently squeeze the release tab and rotate upward to detach. Check the pinout table below for color codes and functions before splicing:
| Pin | Wire Color | Function |
|---|---|---|
| 1 | Dark Green/Orange | Speaker front left (+) |
| 2 | Dark Green/White | Speaker front left (–) |
| 3 | Violet/White | Speaker rear left (+) |
| 4 | Violet/Black | Speaker rear left (–) |
| 5 | Dark Blue/White | Speaker front right (+) |
| 6 | Dark Blue/Yellow | Speaker front right (–) |
| 7 | Yellow/White | Constant 12V power |
| 8 | Gray | Switched ignition |
| 9 | Brown | Ground |
| 10 | Light Blue/Red | Speaker rear right (+) |
| 11 | Light Blue/Orange | Speaker rear right (–) |
| 12 | Pink | Antenna trigger |
Secondary Harness Considerations
Behind the lower glove box, a smaller four-pin harness supplies power to the amplifier if equipped. Remove the lower dash panel after loosening two 8mm bolts–access here requires tilting the passenger seat fully backward. Match the pink (amp +12V), black/white (amp ground), and two orange wires (CAN bus signals) with the aftermarket harness to retain factory functionality. Never force connectors–misalignment damages pins, requiring module replacement.
Color Codes and Pin Assignations for the Factory Audio System Harness
Begin integration by matching the vehicle’s OEM plug terminals to aftermarket components using these standardized color mappings: Pin 1 (Dark Green/White) delivers amplified front right speaker output (positive); Pin 2 (Violet/White) handles front left (positive), while Pin 3 (Brown/Red) carries constant 12V power from the battery feed. Pin 4 (Black/Light Blue) routes ground, critical for noise suppression; swap this first when diagnosing interference. Insert Pin 5 (Gray/Orange) for illumination dimming control–failure here disables dash backlighting sync. Pin 6 (Pink/Yellow) provides switched accessory voltage, dropping below 11V during cranking; verify with a multimeter before relying on this circuit for memory retention. Pin 7 (Dark Blue/Orange) links the antenna motor, activating upon tuner engagement; bypass this only for fixed-mast setups. Remaining positions–Pin 8 (Yellow/Black) for parking brake override detection and Pin 9 (Tan/White) for reverse signal–require no intervention unless modifying CAN-bus interface modules.
Critical Harness Modifications
Isolate Pin 10 (Light Blue/White) for steering wheel command data; cutting this wire voids voice control without proper resistor networks. For vehicles equipped with Uconnect, Pin 12 (White/Light Green) transmits microphone input–shield this with foil tape to eliminate alternator whine. When splicing, use 18-20 AWG heat-shrink butt connectors on speaker wires (Pins 1-2, 14-15) to prevent impedance spikes; soldering risks insulation melt due to harness bundling proximity to the HVAC core. Test each connection with a 1kHz tone generator at 50% volume before securing the dash fascia–clipping or chattering pinpoints loose crimps. Retain OEM plugs only if retaining navigation; otherwise, repurpose Pin 16 (Orange/Black) (DVD speed signal) as a dedicated subwoofer trigger by relocating it to a fused relay.
Step-by-Step Guide to Removing the Dash Bezel for Infotainment System Access
Before disassembly, disconnect the negative battery terminal to prevent electrical shorts. Use a 10mm socket or wrench to loosen the terminal clamp, then secure the cable away from the battery post. This prevents accidental reconnection while working near sensitive electronic components.
Tools and Materials Required
- Plastic trim removal tools (pry bars) – avoid metal tools to prevent scratches
- #2 Phillips screwdriver for dashboard fasteners
- 8mm socket for climate control module bolts (if equipped)
- Magnetic tray to organize small screws and clips
- Microfiber cloth for cleaning surfaces during removal
Begin by removing the ashtray or storage compartment below the climate controls. Grip the edges firmly and pull straight out–this unit typically detaches with light force. If resistant, check for hidden clips on the underside; release them carefully using a trim tool.
Next, locate the two screws securing the center console trim. They are often concealed beneath small plastic covers near the hazard button. Pop these covers with a flathead screwdriver, then remove the screws with a #2 Phillips. The trim should now lift away with minimal resistance–if stuck, verify no additional clips remain engaged along the sides or base.
With the trim removed, identify the four mounting bolts around the infotainment housing. Two are visible at the top corners, while the lower pair may be obscured by the climate control module. If present, unbolt the climate module using an 8mm socket–disconnect its electrical connector before full removal. Set the module aside in a safe location.
Using a plastic pry bar, gently separate the dash bezel from the main dashboard. Work from the bottom upward, releasing six to eight plastic clips along the perimeter. Apply steady pressure–excessive force can snap the clips. Once freed, tilt the bezel forward and disconnect any wiring harnesses or antenna cables attached to the rear of the display unit.
- Verify all connectors are unplugged before lifting the bezel completely.
- Note the position of wiring harnesses for reinstallation.
- Store the bezel on a soft surface to avoid scratches.
- Reassembly follows the reverse order, ensuring all clips snap securely into place.