Complete 2007 Mitsubishi Galant Radio Wiring Schematic Guide

To bypass common installation errors, locate the 16-pin harness behind the factory stereo head unit. Pin assignments follow a standard convention: pin 1 delivers constant 12V power (red), pin 5 supplies switched ignition (yellow), and pin 9 handles ground (black). The remaining pins distribute speaker feeds–front left (pin 10/11, light blue/blue), front right (pin 12/13, pink/white), rear left (pin 14/15, violet/light violet), and rear right (pin 2/3, orange/red). Cross-check these against a multimeter reading before splicing.

Aftermarket adapters rarely match factory pinouts without modification. If integrating an alpine or pioneer receiver, cut the OEM plug and wire directly to a Metra 70-1703 or Scosche MA03B harness–both accommodate the sedan’s proprietary connector shape. For amplified setups, retain the factory amp beneath the driver’s seat; disrupting its circuit triggers a persistent error code B1400, disabling the entire head unit until reset via the diagnostic menu.

Speaker impedance on this model measures 4 ohms across all channels. Replacing stock drivers with 6.5-inch coaxials requires bypassing the internal crossover–a task best accomplished by removing the door panel and clipping the crossover wires directly at the tweeter pod. Avoid soldering the tweeter leads to the woofer terminals; instead, bridge them with a 0.5µF capacitor to preserve high-frequency response without overloading the amp.

Auxiliary input integration demands tapping into the AUX bus wires behind the climate controls. Green/white (pin 4) carries the left channel, brown/white (pin 3) the right–both require shielding with foil tape to prevent alternator whine. For Bluetooth retrofit kits, source a MIC-LINE input adapter from a 2008 model; earlier variants lack the necessary preamp voltage, causing distorted microphone signals.

Factory Stereo Pinout Guide for the 2006 Sedan Variant

Locate the 12-pin harness connector behind the dash fascia on the driver’s side–it’s clipped into the upper instrument panel bracket. Pin assignments follow this mapping:

• Pin 1 (red/black): +12 V constant from fuse #12 (15 A)
• Pin 2 (yellow): ANT feed, +12 V switched via ignition
• Pin 3 (blue/white): amplifier turn-on
• Pin 4 (black): chassis ground
• Pins 5–8 (gray, gray/black, white, white/black): front right (−) (+), front left (−) (+)
• Pins 9–12 (purple, purple/black, green, green/black): rear right (−) (+), rear left (−) (+)

Use 18-gauge crimp splices for speaker leads and solder all power/ground joints; shrink-wrap every joint before reassembling the console.

Harness Adapter Shortcuts

1. Match the included Metra 70-1761 or Scosche MA09B wiring harness directly–color codes align as-is.
2. For an aftermarket head unit requiring higher current, tap the fusible link (orange) at the junction box under the hood instead of fuse #12.
3. If retaining the OEM amplifier, keep the blue/white lead intact; removal causes 50 % volume drop.

Choosing the Right Aftermarket Head Unit Plug Adapter

Begin by locating the factory audio system connector behind the dashboard’s center panel. This 16-pin harness interface varies slightly across trim levels, so verify pinouts with a multimeter before purchasing an adapter. Pre-made harnesses labeled “ISO 10400” or “Metra 70-8112” match most variants, but inspect the color-coding against your vehicle’s power, speaker, and antenna leads to prevent mismatches.

Key wires to confirm include:

• Constant power (yellow): Must read 12V when the ignition is off.
• Switched power (red): Should drop to 0V when the key is removed.
• Ground (black): Test for continuity to the chassis.
• Speaker outputs: Use a 9V battery to check polarity–positive wires will produce a click from the speaker.
• Illumination (orange/white): Should dim in sync with dashboard lights.

If the original connector shows signs of tampering (e.g., spliced wires), replace the entire harness with a soldered and heat-shrunk OEM-style plug to avoid intermittent failures.

Aftermarket adapters often include extra leads for features like steering-wheel controls or parking sensors. Ignore these if your new head unit lacks compatibility–taping off unused wires prevents short circuits. For vehicles with amplified audio systems, confirm whether the interface includes a built-in amp turn-on lead (typically blue/white) or requires a separate relay kit to activate external amplifiers.

Store-brand adapters (e.g., Scosche, PAC) typically include color-coded diagrams, but cross-reference these with the vehicle’s service manual to spot deviations. Common mismatches occur with:

• Twisted-pair speaker wires (e.g., green/white stripes) being labeled as single leads.
• Factory mute wires (gray/violet) misidentified as illumination circuits.
• Amplifier triggers wrongly assigned to antenna motors.

If the harness lacks clear markings, use a tone generator to trace connections back to their source components. Label each wire with masking tape before cutting to simplify troubleshooting later.

For European-spec systems or models with fiber-optic audio, select an adapter with optical outputs (e.g., Metra 70-5001). These require specialized connectors–verify the head unit’s optical input specifications (coaxial/TOSLINK) to avoid signal degradation. In North American markets, bypass the factory amplifier entirely by connecting speaker wires directly to the aftermarket head unit’s outputs, ensuring impedance matches (4-ohm nominal).

Final checks should include:

1. Testing all functions (radio, CD, USB) with the key in both “ACC” and “ON” positions.
2. Verifying no dash warning lights appear (e.g., airbag or ABS errors from severed CAN bus wires).
3. Confirming all speakers produce balanced sound without distortion at higher volumes.

If interference occurs (e.g., alternator whine), add a ground-loop isolator or relocate the ground wire to a bare metal point on the firewall. Avoid daisy-chaining grounds with other accessories, as this can introduce noise into the audio system.

Color-Coded Pinout Guide for Factory Audio System Harness

Cut back the harness sleeve 2.5 inches from the factory plug to expose individual conductors. Strip each lead 1/4 inch, twist strands tightly, and tin with rosin-core solder to prevent fraying before crimping or soldering aftermarket connectors.

Connector Pin	Base Color	Stripe Color	Signal Type	Verify Voltage (Key ON)
A1	White	Blue	Front Left (+)	2.2V RMS
A2	White	Red	Front Left (-)	0V
A3	Grey	Blue	Front Right (+)	2.2V RMS
A4	Grey	Red	Front Right (-)	0V
A5	Green	Black	Rear Left (+)	2.1V RMS
A6	Green	Yellow	Rear Left (-)	0V
A7	Violet	Black	Rear Right (+)	2.1V RMS
A8	Violet	Yellow	Rear Right (-)	0V
B1	Black	–	Ground	0V
B2	Red	–	Battery (+12V Constant)	12.6V
B3	Yellow	–	Ignition (+12V Switched)	12.6V
B4	Illumination	–	Orange	Adjusts 0-12V with dimmer

Connectors snap securely only when both locking tabs engage simultaneously–misalignment risks intermittent power loss to memory functions. Label each wire with heatshrink tubing marked in matching base and stripe colors before routing through the dash cavity to avoid crossed signals.

Power leads require minimum 16-gauge copper wire; speaker wires tolerate 18-gauge, but attenuation becomes perceptible above 12 feet from amplifier. Twist positive and negative pairs at least 12 turns per foot to reject induced noise from adjacent HVAC motors and ignition coils.

Confirm each circuit with a multimeter prior to final connections–reverse polarity kills tweeters instantly and causes low-frequency distortion detectable only at high volumes.

How to Locate and Disable the Antitheft Feature Before Head Unit Removal

Disconnect the negative terminal of the battery first. Wait at least 10 minutes to ensure residual power drains from the vehicle’s electrical system. This step prevents the security module from locking the device during extraction. Reconnecting the terminal prematurely risks reactivating the protection, requiring a factory reset procedure.

Identifying the Security Code Input Screen

Turn the ignition to ACC or ON–without starting the engine–and observe the display. A locked unit will show “CODE,” “SAFE,” or a blank screen with an error indicator. Count the number of buttons on the faceplate: most models use five preset buttons (1–5) for code entry. If the system lacks a numeric display, check for a hidden LED near the volume knob or beneath the eject slot.

Locate the default security code, typically found on a white or yellow sticker inside the glovebox, trunk lid, or owner’s manual pouch. The code consists of four or five digits; if missing, retrieve it from the dealership using the VIN. Avoid third-party code generators–they frequently output incorrect sequences, risking permanent lockout after three failed attempts.

Reconnect the battery terminal after entering the code. Press and hold preset button 1 until an audible beep confirms deactivation. If the unit remains locked, cycle the ignition OFF for 5 seconds, then repeat the process. For persistent issues, remove the head unit’s fuse (check the owner’s manual for location) for 30 seconds–this forces a hard reset without triggering the antitheft routine.

Safe Power, Ground, and Audio Line Installation to Prevent Fuse Failures

Identify the constant 12V supply feed marked “B+” or “Battery” on the connector–typically a yellow cable with a fuse rating between 15-20A. Verify this with a multimeter set to DC voltage; voltage should persist with the ignition off. Connecting this directly to an aftermarket head unit requires matching or exceeding the stock fuse amperage; undersized fuses risk tripping under load.

Locate the switched power terminal, often labeled “ACC” or “Ignition,” normally a red wire less than 10A. Test for voltage only when the key is in the “on” or “accessory” position. If splicing this feed, use a relay for high-draw devices to reduce voltage drop across lengthy runs or thin-gauge factory lines.

Ground points demand clean, bare-metal contact; sand paint or corrosion off chassis bolts before securing. Factory ground straps–usually black–may cluster near fuse panels or firewall mounts. Bolt aftermarket connections here with star washers to prevent loosening over time. Avoid daisy-chaining grounds through multiple devices; single-point grounding reduces noise and resistance spikes.

Speaker outputs carry polarity-sensitive signals; reversing positive and negative channels creates phase cancellation, muddying midrange. Confirm factory speaker wires using a 1.5V AA battery–brief contact produces a faint pop from the corresponding driver. Strip only enough insulation for secure crimp connectors; excess exposed copper strands invite short circuits when terminals vibrate against adjacent wires.

Use 18-22 AWG oxygen-free speaker wire for clarity; thinner cables introduce distortion under heavy transients. Route wires away from ignition coil packs and alternator leads to avoid electromagnetic interference. Shield twisted pairs if splicing into existing harnesses, especially near CAN bus networks prone to RF noise.

Before energizing, insert an in-line fuse holder rated slightly above the total current draw–sum amplifier idle current plus peak head unit demand. Test each connection with a 12V test light; absence of glow confirms no short before attaching permanent terminals. If fuse blows immediately, isolate circuits by disconnecting speaker channels one pair at a time.

High-power amplifiers require dedicated heavy-gauge feeds straight from the battery. Run 4-8 gauge cables through firewall grommets, avoiding sharp edges and hot exhaust manifolds. Install a distribution block if powering multiple components–fuse each branch individually to isolate faults and simplify troubleshooting.

Final checks: wiggle every connector while observing for voltage drops at 10mV or more on a multimeter. Secure all cables with loom tubing or spiral wrap, especially near moving parts like doors and seats. Re-seal any cut factory harnesses with heat-shrink tubing or silicone tape to prevent moisture ingress.