Locate the 12-pin harness connector behind the center stack–it’s the black plug with a release tab on the top. Pin 1 (yellow wire) delivers constant 12V power, while pin 8 (red) activates with the ignition. If your aftermarket unit lacks power, verify these two lines first before touching anything else. Ground sits on pin 7 (black), but don’t rely solely on it–solder a secondary 10-gauge ground directly to the chassis behind the glove box for cleaner signal.
Speaker outputs follow a strict pairing: front left positives (pin 2, gray) and negatives (pin 3, gray/black) carry 4 ohms, while rear right channels use pin 12 (purple) and pin 13 (purple/black). Swap these at your own risk–many factory amps expect impedance-matched loads, and mismatching can fry the internal amplifier module within 90 seconds. For passive setups, bypass the amp entirely by tapping into the pre-amp outputs (pins 9–11, brown/white, pink/light blue, dark green) with RCA adapters if you’re running an external processor.
Illumination control sits on pin 4 (orange/white), dimming in sync with the dash lights. If your new head unit stays brightly lit at night, you’ve likely overlooked this wire–patch it through or isolate it with a 1k-ohm resistor to prevent voltage feedback. Steering wheel controls retain functionality via pin 6 (green/white), but require a CAN bus decoder for models equipped with Uconnect. Cheap harness adapters often omit this, leaving volume buttons dead–opt for the Metra ASWC-1 or Axxess AX-ADCT2 for plug-and-play compatibility.
When testing, never probe live circuits with a multimeter’s continuity setting–you’ll short adjacent pins. Use a non-contact voltage tester or backprobe connectors with paperclips inserted into the rear of the plug. If the factory display throws error codes post-installation, confirm the MOST fiber-optic loop (pin 14, purple/white) remains intact; severing this kills satellite radio and navigation updates. For vehicles with rear-seat entertainment, the aux video feed runs on a separate 4-pin mini-DIN–locate it under the driver’s seat before cutting into the main harness.
Understanding Your Vehicle’s Audio System Connections
Locate the 12-pin harness behind the factory head unit–this is your primary interface. The pinout follows a standard arrangement: pins 1-4 handle speaker outputs, 5-8 manage power and ground, while 9-12 serve auxiliary inputs or antenna triggers. Use a multimeter set to 20V DC to verify voltage at pin 5 (constant 12V) and pin 8 (ground) before connecting any aftermarket device.
For speaker wiring, match harness colors to the vehicle’s original cable labels. Front left (+) typically uses a solid gray wire, while front right (+) corresponds to a solid violet. Negative leads often include a stripe–gray with black for left (-) and violet with black for right (-). Rear speaker polarity follows a similar pattern but with darker shades: solid green (rear left +) and solid brown (rear right +), with their striped counterparts indicating negatives.
| Harness Pin | Function | Wire Color | Voltage/Notes |
|---|---|---|---|
| 1 | Front Left (+) | Gray | 4-8V peak |
| 2 | Front Left (-) | Gray/Black | Ground reference |
| 3 | Front Right (+) | Violet | 4-8V peak |
| 4 | Front Right (-) | Violet/Black | Ground reference |
| 5 | Constant Power | Yellow | 12V (fused at 10A) |
| 6 | Illumination/Accessory | Orange | 12V with ignition |
| 8 | Ground | Black | Direct chassis connection |
If integrating an amplifier, tap into the constant power (pin 5) and ground (pin 8) wires using crimp connectors–avoid soldering near the harness to prevent heat damage. For turn-on signals, splice into the orange wire (pin 6), but connect a 12V relay if the aftermarket unit draws more than 300mA. The blue/white wire (pin 10) serves as an antenna trigger; connect it directly to the new head unit’s corresponding output to ensure automatic power-ups.
When replacing the original unit, disconnect the negative battery terminal first. If retaining steering wheel controls, purchase an adapter compatible with Chrysler’s CAN-BUS protocol–the PAC SWI-JACK is a verified solution. For backup cameras, feed the video signal into pin 12 (typically purple/white) and ensure the new display supports NTSC format at 720×480 resolution.
Test all connections before finalizing installation. Play a 1kHz tone through each speaker, verifying balanced output using a decibel meter. If distortion occurs below 15W, recheck ground integrity and speaker impedance (4 ohms nominal). For coaxial tweeters, ensure crossovers are wired in-phase–reverse polarity on one channel can cancel midrange frequencies.
Stow leftover wires in split loom tubing, securing them away from moving parts or heat sources. Use cable ties to bundle exceptions, but never overtighten–vibration can chafe insulation over time. If the original harness shows brittle or cracked wires, replace the entire plug with a new connector kit (OEM part #68039347AA) to prevent intermittent failures.
Finding the Infotainment System Harness Connection Under the Panel
Begin by removing the lower dashboard trim panel on the driver’s side–this requires prying off the clips securing it in place with a plastic trim tool. Once detached, the main harness connector for the audio head unit will be visible, typically positioned near the climate control module. Look for a rectangular, 12-pin plug with color-coded wires; this is the primary link to the vehicle’s electrical network.
Key Visual Indicators
The harness connector often has a distinct latch mechanism–press the release tab to disconnect it without damaging the terminals. Wires are labeled by function: power (red or yellow), ground (black), illumination (orange), and speaker outputs. If labels are absent, trace the cables back to their origin–factory harnesses follow a standardized color scheme for easier identification.
For vehicles equipped with premium sound systems, additional plugs may include connections for amplifiers or external antennas. These secondary connectors are usually grouped near the primary harness but may require removing adjacent components, such as the glovebox or center console trim, to access fully.
Verify the harness layout against a service manual before proceeding–some models integrate fuse boxes or relays behind the dash, and accidental disconnection could disrupt other systems. Use a multimeter to confirm continuity on power wires before attaching aftermarket devices.
Decoding Audio System Cable Hues for Your Sedan’s Head Unit
Locate the 12-pin connector behind the factory stereo–pin A8 carries a bright orange stripe cable; this is the primary power feed requiring a minimum 10-gauge fuse. Attach it directly to the vehicle’s ignition-switched circuit to prevent battery drain. Verify voltage with a multimeter before securing connections–a reading below 11.8V suggests corrosion or a faulty relay.
- Yellow with black tracer: Constant 12V memory power–must bypass the ignition to retain preset stations and clock settings.
- Dark green/white stripe: Front left speaker positive–swap with brown/white if polarity is reversed during installation.
- Violet/black stripe: Rear right speaker negative–test continuity with the head unit disconnected to isolate shorts.
Ground wires (black or black/brown) cluster near pin A9–use a dedicated chassis point, not screw holes sharing other components. Sand paint off mounting surfaces to ensure conductivity; loose grounds cause intermittent power loss or electrical noise. If static persists, inspect for pinched cables near the gear shift mechanism.
Illumination control uses a thin gray wire (pin A11) dimming in sync with dashboard lights–adjust resistors if brightness flickers. Antenna trigger (solid pink, pin A6) requires a 200-ohm pull-up resistor when retrofitting aftermarket units; omit this step only if the new stereo natively supports the sedan’s amplified antenna system.
- Strip cables to 5mm of exposed copper–excess length invites shorts.
- Crimp terminals with insulated connectors; solder joints risk brittle failure under vibration.
- Label each wire before disconnecting the original harness–plastic zip ties color-coded to match functions speed reassembly.
- Wrap completed connections in adhesive-lined heat shrink tubing, not electrical tape.
How to Connect an OEM Stereo Harness to Third-Party Audio Cables
Strip 6mm of insulation from each factory speaker lead using wire strippers set to 18-20 AWG. Twist the exposed copper strands into a tight bundle to prevent fraying before crimping. Match the aftermarket harness color codes against the vehicle’s original connector pinout–ground is typically black, constant 12V yellow, switched power red, and illumination orange with a violet tracer.
Align the stripped factory wire ends with the corresponding aftermarket connectors, ensuring polarity consistency for front and rear channels. Front-left positive (gray) must connect to front-left positive, rear-right negative (violet) to rear-right negative. Secure temporary connections with 3M Scotchlok UR2 splices; apply heat shrink tubing over each splice before soldering for corrosion resistance.
Soldering Best Practices
Use a 60W soldering iron with a chisel tip to minimize heat transfer to adjacent cables. Melt a 2mm bead of rosin-core solder onto each twisted joint, working in batches of two pairs to prevent overheating. Verify continuity with a multimeter set to 200Ω; readings should show 0.5Ω or less between matching pairs, infinite resistance to unrelated wires.
Slide the heat shrink tubing over the soldered joints and apply heat from a heat gun set to 200°C. Overlap the tubing by 5mm on each end to seal moisture. Bundle the finished connections with spiral wrap, securing every 5cm with nylon zip ties to prevent vibration-induced stress fractures under the dash.
Final Verification Steps
Reconnect the vehicle’s battery and test each audio channel at 50% volume before securing the stereo chassis. Check dimmer functionality by toggling headlights; illumination wire voltage should drop proportionally. Ground loops manifest as alternator whine–isolate by installing a ground loop isolator inline with the RCA preamp outputs.
Route excess cable length behind the climate control module to avoid pinch points. Secure the harness to existing factory clips using Tesa 51608 fabric tape, avoiding adhesives that degrade under heat. Document each connection in a photo log for future troubleshooting.