Start with locating the fuse box under the dashboard on the driver’s side–label F47 supplies power to the audio head unit. Use a 12V test light to confirm continuity at the 10A fuse; if absent, replace it with an identical rating. Next, trace the light green/orange wire from the fuse panel to the back of the stereo harness–this is the constant power feed required for memory functions.
The dark blue/white wire provides switched power activated by the ignition. Connect this to a reliable 12V source that engages with the key’s ACC or ON position. Failure here will prevent the unit from powering on. For ground, follow the bare or black wire to its chassis point near the kick panel–ensure a solid, corrosion-free connection to avoid intermittent operation or noise.
Speaker wires follow a consistent color code: front left (+) gray/dark gray, (-) gray/light blue; front right (+) white/black, (-) white/brown; rear left (+) pink/purple, (-) pink/white; rear right (+) violet/dark green, (-) violet/white. Connect these directly to aftermarket or OEM speakers–crossing polarity will reverse audio channels and distort sound. For amplified systems, the orange/dark blue wire carries the remote turn-on signal; splice this to the amplifier’s trigger input to synchronize power-on sequences.
If the vehicle retains its factory amplifier, locate the data bus wires–typically yellow/black (CAN high) and green/white (CAN low). These facilitate communication between the stereo and vehicle modules; cutting or improperly terminating them may disable other systems like climate control or chimes. For aftermarket installations requiring steering wheel controls, use an interface module that translates resistive signals into standard button presses–avoid direct wire splicing to prevent permanent module damage.
Full Electrical Schematic for Chrysler Compact Audio System
Start by locating the factory harness behind the dashboard on the driver’s side–it uses a 12-pin connector with color-coded leads. Match each wire to this pinout:
- Yellow: Constant 12V power (fused at 10A)
- Red: Ignition-switched 12V (fused at 15A)
- Black: Ground (bolt to chassis near kick panel)
- Gray/Pink stripe: Front left speaker (+)
- Gray/Yellow stripe: Front left speaker (–)
- White/Orange stripe: Front right speaker (+)
- White/Light blue stripe: Front right speaker (–)
- Purple/White stripe: Rear left speaker (+)
- Purple/Black stripe: Rear left speaker (–)
- Dark green/Red stripe: Rear right speaker (+)
- Dark green/Black stripe: Rear right speaker (–)
- Light blue/White stripe: Antenna trigger (12V for power antenna)
Disconnect the battery negative terminal before splicing. Use crimp connectors–not solder–for reliability under vibration. Verify all connections with a multimeter; resistance between speaker leads should be 4 ohms ± 0.5 ohms.
Factory amplifiers in premium models require a separate 18-gauge pink wire tapped from the fuse box (fuse #14, 10A) for amplifier turn-on. Failure to connect this will result in no sound, even if speakers are correctly wired.
Aftermarket units often include a harness adapter plug-and-play for this model. If not, create one using a 12-pin Metra 70-1002 or equivalent. Ensure the adapter’s pinout exactly matches the factory leads–crossed wires risk frying the head unit.
Optional steering wheel controls use a two-wire bus (clock and data) interfaced via a bypass module. Connect the module’s yellow wire to the red harness lead and the purple wire to the serial data line (gray/black stripe in the harness). Configure the module to Chrysler protocol version 2.3 for full button functionality.
For amplified systems, route all new wiring away from the alternator and ignition coils to avoid interference. Use shielded RCA cables if adding a subwoofer, grounding the shield at a single chassis point.
Test each channel individually with a 1 kHz sine wave at 50% volume. Distortion or popping indicates a short or incorrect phase on a speaker wire. Recheck polarity if rear channels produce no bass.
Label every wire with masking tape after connection. Store the original wiring schematic under the seat or in the glove box for future diagnostics–factory color codes rarely change across model years but aftermarket documentation often omits critical details.
Finding the Original Audio System Harness Plug on Your Vehicle
Start by removing the center console trim panel. Use a flathead screwdriver to carefully pry the clips securing the lower dash cover–avoid forcing the tabs, as they snap easily. The connector resides directly behind the climate control unit, positioned at a slight upward angle.
The harness plug has a distinctive trapezoidal shape with 16 pins arranged in two parallel rows. Pin layout follows this order: left row (top to bottom) accommodates power leads–constant 12V (orange), switched ignition (yellow), and ground (black). The right row handles speaker outputs: front left (gray/black), front right (white/black), rear left (green/black), and rear right (purple/black).
Trace the harness cable from the factory audio unit’s rear. The bundle runs downward along the left side of the transmission tunnel, merging with the vehicle’s main wiring loom near the kick panel. A secondary retaining clip holds it in place–release this before attempting to disconnect.
Check for a secondary harness adapter if an aftermarket system was previously installed. These adapters often remain attached, complicating identification. Genuine factory connectors use color-coded wires; aftermarket ones may have labels like “AMP” or “ILLUM” but lack consistency.
Verifying Connector Integrity
Inspect the plug for corrosion or bent pins before proceeding. Use a multimeter to confirm continuity on critical leads–constant power should read 12V regardless of ignition state, while switched power drops to zero when the key is off. Speaker wires should show resistance between 2-4 ohms.
The ground wire attaches to a body-ground point behind the glove box. Follow the black wire from the harness; it terminates in a ring terminal secured by a 10mm bolt. Ensure this connection is free of paint or rust to prevent signal interference.
If the connector is missing, the harness may have been spliced. Locate splices by peeling back the factory loom’s tape–original connections use solder and heat shrink, while hasty repairs often rely on electrical tape or butt connectors.
For vehicles with premium audio, an additional amplifier harness exists. This smaller 8-pin connector is typically tucked above the pedals, bundled separately. Match wire colors to the same scheme, but note the thicker gauge for amplified outputs.
Decoding Color-Coded Connections in the PT Compact Wagon Audio System
Locate the yellow (B+) wire first–it delivers constant 12V power directly from the battery, ensuring memory retention for presets and clock settings. This circuit remains live even when the ignition is off, so treat it as a primary fuse-protected line to prevent parasitic drain. If replacing the head unit, splice this wire to the new harness using a crimp connector or solder joint, then insulate with heat-shrink tubing.
Key Solid and Striped Conductors
The dark green/white stripe serves as the vehicle speed sensor input, critical for automatic volume adjustments. Disrupting this connection may trigger false speed readings or disable speed-sensitive volume features. For aftermarket installations, verify compatibility–some amplifiers simulate this signal via firmware rather than relying on the OEM feed.
Illumination controls run through the light green/orange stripe wire, which dims the display in sync with dashboard lights. Test this circuit with a multimeter in voltage mode; expect ~0V when headlights are off and ~12V when activated. If the screen remains fully bright or fails to dim, inspect the fuse (typically 10A) and the dimmer switch for corrosion. The gray/black stripe carries ground for the antenna motor–ensure it terminates cleanly at the chassis, avoiding daisy-chained grounds shared with high-current devices.
Speaker outputs follow a predictable pattern: solid colors (e.g., gray, white) denote positive leads, while striped versions (e.g., gray/black, white/black) carry the negative return. Front left output uses gray and gray/black; rear left relies on brown and brown/black. Swapping polarity here causes phase cancellation, audibly thinning bass response. Use a polarity tester or scope to confirm correct orientation if speakers sound weak or hollow.
For steering wheel control integration, tap the pink/light blue wire–this data line carries resistive signals from button presses. Aftermarket adapters (e.g., PAC RP4-CH11) interpret these values; splices must avoid introducing resistance, which distorts commands. If controls fail, probe the wire with a voltmeter: expect ~0.5V–4.5V changes during button presses. Shorts or open circuits often trace back to chafed insulation near the column clock spring.
Guide to Integrating New Audio Hardware in a PT Series Vehicle
Begin by disconnecting the negative terminal of the car battery to prevent short circuits during installation. Locate the factory harness behind the dash panel–typically encased in a black or gray plastic cover near the center console. Use a trim removal tool to carefully detach the dashboard fascia without damaging retaining clips. Identify the OEM connector pins by color and function, cross-referencing with an adapter harness designed for late-model Chrysler platforms to ensure compatibility.
Connect the aftermarket unit’s adapter harness to the vehicle’s existing wiring using the following pinout reference. Solder or crimp connections for durability, then insulate with heat-shrink tubing or electrical tape. Verify voltage on critical leads with a multimeter–constant 12V (yellow), ignition-switched 12V (red), ground (black), and illumination (orange) should match expected readings before proceeding.
| Factory Wire Color | Adapter Function | Aftermarket Wire Color |
|---|---|---|
| Dark Green/Orange | Left Front Speaker (+) | Gray |
| Dark Green/Violet | Left Front Speaker (-) | Gray/Black |
| Brown/Yellow | Right Front Speaker (+) | White |
| Brown/White | Right Front Speaker (-) | White/Black |
| Light Blue/White | Antenna Trigger | Blue |
Final Checklist Before Powering On
Secure all loose wires with zip ties to prevent interference with moving components like the HVAC controls or steering column. Reinstall dashboard trim, ensuring no gaps or misalignments. Reconnect the battery, then test all audio outputs–verify clarity on all speakers, proper mute functions during Bluetooth pairing, and correct operation of steering wheel controls if using an interface module. If static or distortion occurs, recheck grounds and speaker polarity.
For retained factory features like chimes or OnStar, integrate a vehicle-specific integration module between the adapter harness and the new head unit. Program the module via manufacturer instructions to restore lost functionality. Failure to include this step may result in inoperative safety alerts or diagnostics warnings.