Complete Mitsubishi Eclipse 2000 Radio Wiring Color Codes and Diagram Guide
To install or troubleshoot your vehicle’s head unit, locate the C-201 connector behind the dashboard panel–this is where the primary harness interfaces with the factory audio system. The ignition-switched 12V power lead is pin 1 (light green/black), while constant battery power runs through pin 10 (yellow). Ground the unit via pin 11 (black) for stable operation. Avoid splicing into the illumination circuit (pin 3, red/black)–this feed controls dimming but can cause voltage drops if mismanaged.
For speaker outputs, identify the front right positive (pin 6, gray/black) and front left positive (pin 4, white/black), paired with their negative counterparts (pin 5 and pin 8, respectively). The rear channels follow a similar pattern: pin 2 (violet/black, rear right) and pin 7 (green/black, rear left). Verify resistance between each speaker wire and ground–values above 2 ohms suggest faulty connections or damaged factory harnesses.
If replacing the stock stereo with an aftermarket unit, use a Metra 70-8112 or Scosche MI03B adapter harness. These adapters match the factory plug configuration, eliminating the need for wire stripping. For vehicles with the GT trim, confirm the presence of the amplifier turn-on lead (pin 9, pink/black)–failure to connect this wire results in distorted sound or no output. Test for 12V at pin 9 when the ignition is on; absence indicates a blown fuse or severed wire behind the glovebox.
Monitor the data bus wire (pin 12, orange/white) if your vehicle features steering wheel controls or factory alarms. Cutting this wire disables these functions permanently. For vehicles equipped with a CD changer, retain the pin 13 (blue/white) connection to maintain compatibility. Always disconnect the negative battery terminal before handling wiring to prevent shorts or airbag deployment.
Electrical Connections for Your Sport Coupe Audio System
Begin by locating the harness behind the factory stereo unit. The main power wire (typically red) connects to a 12V ignition source–use pin 10 on the 16-pin connector. Ground the black wire (pin 3 or 4) to the chassis near the installation area, ensuring bare metal contact after removing paint or rust.
Color-Coded Wiring Breakdown
- Yellow: Constant battery power (pin 9) – connects directly to the vehicle’s fuse box, preferably to a 10A fuse slot marked “ACC” or “RADIO.”
- Orange (if equipped): Illumination control (pin 6) – splices to the dimmer switch wire, often gray with a black stripe in the dash harness.
- Blue/White: Amplifier remote turn-on (pin 5) – links to aftermarket amplifier trigger inputs if applicable.
- Speaker Wires:
- Front Left: Light green (positive, pin 1) / Dark blue (negative, pin 2)
- Front Right: Gray (positive, pin 13) / Red (negative, pin 14)
- Rear Left: White/black (positive, pin 11) / Green/black (negative, pin 12)
- Rear Right: Violet (positive, pin 15) / Brown (negative, pin 16)
Avoid twisting exposed wire ends together for temporary testing; use crimp connectors or solder with heat-shrink tubing for permanent installation. Voltage drops above 0.5V on the power or ground wires indicate poor connections–retrace and clean contact points.
For vehicles with automatic antenna control, the dark blue wire (pin 7) activates the motorized mast. If replacing with a fixed antenna, cap this wire to prevent short circuits. Factory-equipped premium audio systems (e.g., Infinity) may include a separate amp under the driver’s seat–consult the original schematic for additional harnesses otherwise spliced.
- Disconnect the negative battery terminal before handling any electrical components.
- Label all removed wires with masking tape to streamline reinstallation.
- Test connections with a multimeter before reconnecting the battery; probe harness pins while someone cycles the ignition to verify ignition-switched power.
Aftermarket harness adapters like Metra 70-8001 simplify compatibility but may omit features like steering wheel controls or chimes. Verify pinouts against the adapter’s included instructions–discrepancies often require custom splicing. For OEM navigation units, retain the pink/blue wire (pin 8) for GPS antenna data.
Troubleshooting Common Issues
- No Power:
- Check fuses (main and ignition-switched).
- Ensure the yellow wire has uninterrupted voltage.
- Inspect the fuse tap connection for corrosion.
- Distorted Audio:
- Confirm speaker polarity–reversing causes phase cancellation.
- Test speakers individually with a 1.5V battery to isolate faulty drivers.
- Replace blown fuses in aftermarket amplifiers.
- Display Errors:
- Factory radios often require specific voltage thresholds (9.5V minimum) for proper boot-up.
- Check the orange illumination wire for shorts or open circuits.
Installing a bypass module (e.g., PAC RP4-CH11) restores steering wheel audio controls without retaining the OEM interface. Wire the harness according to the module’s pinout, noting that the purple/white wire (pin C) typically handles volume down commands while brown/white (pin E) handles mode/phone functions. Always tape unused wires to prevent contact with metal surfaces.
Finding the Audio System Connection Bundle in Your Vehicle
Begin by removing the center console trim panel. It’s secured with four screws–two at the rear near the parking brake and two at the front beneath the climate controls. Use a 7mm socket for the rear screws and a flathead screwdriver for the front clips. Gently pry the panel upward, disconnecting the hazard light switch if present, to access the cavity behind it.
The main harness for the factory sound unit is tucked behind the climate control module. It’s a black, rectangular connector with 16 pins, often labeled “A” or “C” on the back of the factory stereo. Trace the bundle downward to where it splits–one branch leads to the power antenna, the other to the speaker outputs. Mark each wire with masking tape to avoid confusion during reinstallation.
For coupes, the lower dash panel must be removed next. Three screws hold it in place–one near the driver’s side kick panel and two beneath the steering column. Once freed, pull it away to reveal the firewall-mounted harness. The primary feed wires are color-coded: solid red (constant 12V), yellow with a black stripe (switched power), and blue with a white stripe (amp trigger).
Spyders require an additional step–removing the glove box to reach the hidden harness connector. The glove box doesn’t use screws; instead, squeeze the sides inward to release the hinges. Behind it, you’ll find a white 12-pin connector linking the audio unit to the vehicle’s computer. This connector often contains illumination wires (orange with a green stripe) and ground (black or brown).
If the harness isn’t immediately visible, follow the wiring from the back of the head unit downward. It routes behind the air conditioning evaporator and passes through a rubber grommet in the firewall before connecting to the vehicle’s main harness. Avoid tugging on wires–some models have fragile connections near the fuse box. Use a multimeter to verify voltages before disconnecting anything.
Once located, secure the harness with zip ties to prevent it from dropping behind the dash. Label each connector with its purpose–power, speakers, or lighting–to simplify future upgrades or repairs. If replacing the unit, compare pinouts with the new stereo’s harness adapter to ensure compatibility.
Wiring Color Standards and Connector Layout for Factory Head Unit
Begin by identifying the 16-pin ISO harness at the back of the original sound system. The left side (A) carries power and speaker outputs, while the right side (B) handles illumination, ground, and antenna control. Verify each wire against the table below–cross-checking prevents signal shorts or speaker damage during upgrades.
For proper installation, follow these color-to-function assignments strictly. Deviations risk system malfunctions, especially with constant power (yellow) and ignition-switched power (red), which must never be reversed. The solid orange wire supplies 12V memory retention–connecting it to ground erases preset stations.
| Pin | Color | Function | Voltage (Key On) |
|---|---|---|---|
| 1 (A1) | Yellow/Black | Front Right (+) | Variable |
| 2 (A2) | Gray | Front Right (-) | 0V |
| 3 (A3) | Green/Black | Front Left (+) | Variable |
| 4 (A4) | White | Front Left (-) | 0V |
| 5 (A5) | Purple/Black | Rear Right (+) | Variable |
| 6 (A6) | Blue/White | Rear Right (-) | 0V |
| 7 (A7) | Brown | Rear Left (+) | Variable |
| 8 (A8) | Pink | Rear Left (-) | 0V |
| 9 (B1) | Yellow | Battery (+) | 12V |
| 10 (B2) | Red | Ignition (+) | 12V |
| 11 (B3) | Black | Ground | 0V |
| 12 (B4) | Orange | Memory (+) | 12V |
| 13 (B5) | Blue | Antenna Control | 12V (when active) |
| 14 (B6) | Gray/Red | Illumination (-) | 0V (lights on) |
| 15 (B7) | Empty | N/A | N/A |
| 16 (B8) | Empty | N/A | N/A |
Critical Connections for Aftermarket Integration
When replacing the factory unit, splice the yellow (battery) and red (ignition) wires into the new harness–use crimp connectors rated for 20A to handle current draw. The blue antenna control wire requires direct connection to avoid power antenna failures. For vehicles with dimmable dash lights, the gray/red illumination wire must link to the aftermarket unit’s dash-light input to maintain brightness sync.
Speaker polarity matters more than most realize. Swapping positive and negative wires weakens sound quality, especially in full-range systems. Test each channel with a 9V battery–audible pops confirm correct polarity. Never combine grounds from different channels, as this introduces distortion.
For vehicles equipped with a factory amplifier, locate the 12-pin amplifier connector behind the dashboard. The gray harness carries low-level signals–tap into these only if bypassing the amp. Otherwise, retain the original wiring to preserve equalization settings. The green/white wire is a speed-sensitive volume input, typically safe to ignore unless upgrading to a navigation system.