Complete Infiniti G35 Radio Wiring Diagram Guide for 2006 Model
The 2nd-generation luxury sports coupe relies on a 12-pin ISO harness for its OEM sound system integration. Pin numbering follows this exact sequence: A1 (constant 12V), A4 (illumination), A7 (ground), B2 (left front speaker positive), B4 (right front speaker positive), B5 (left front speaker negative), B6 (right front speaker negative), and auxiliary inputs on C1/C2 for amplified subwoofer signal if factory-equipped. Verify continuity between harness and unit before finalizing connections–discrepancies often trace to corroded fuse #24 (10A) in the under-dash panel.
Color codes in the main loom adhere to JIS standards: red/white (power), black/yellow (memory keep), green/black (LF+), green/red (RF+). Connecting aftermarket head units requires a bypass module for the data bus, specifically the K-line signal on pin A8–disabling this will trigger dash warnings on vehicles with navigation. For retained steering wheel controls, splice into the gray/blue (rear wheel speed sensor) wire, not the CAN bus pair.
Amplifier locations differ between sedan and coupe variants. On fixed-head models, the amp sits behind the rear deck; on convertibles, it’s bolted beneath the passenger seat. Both use a four-channel setup with separate clipping indicators on the pre-out RCA–measure 2.1V RMS at idle to confirm signal integrity. If troubleshooting distortion, start with the fuse block behind the glovebox (panel 2, position 11) before examining speaker wires for partial shorts.
Retrofitting Bluetooth or satellite modules demands tapping into the MOST fiber optic ring–insert the splitter at the network hub under the center console, never at the head unit. For factory backup camera integration, the composite video signal runs through purple (camera positive) and black (ground), but requires ignition-switched 12V to prevent parasitic drain. Always terminate unused loom branches with resistors matching the original impedance (typically 33kΩ) to avoid error codes.
Vehicle Audio System Connection Guide for the QX-Series Sports Sedan
First, secure a 12-pin harness adapter compatible with Bose premium sound layouts–part number METRA 70-8112 fits directly. Match harness wires by function rather than color: the pink/black stripe delivers switched +12V, while solid orange carries constant power for memory retention.
Disconnect the negative battery terminal before stripping any wires to prevent short circuits. Use a multimeter to verify connections–set to DC voltage, probe between ground and each wire to confirm expected readings (e.g., 12V for power leads, ~4.5V for speaker outputs).
- Speaker outputs follow this pattern:
- Front left positive: gray
- Front left negative: gray/black stripe
- Rear right positive: purple
- Rear right negative: purple/black stripe
- Subwoofer output: brown/white stripe (+), brown (-)
- For reverse signal, tap the light green wire–it carries 12V when the transmission shifts into reverse.
- Illumination control requires splicing into the dimmer circuit (light blue/white stripe), which varies voltage between 0-12V.
Solder all connections using 60/40 rosin-core solder and heat-shrink tubing to prevent corrosion. Avoid twist-and-tape methods–these fail under vibration. For ground points, scrape paint from chassis contact points and use star washers to ensure minimal resistance (target
Aftermarket amplifiers require 4-gauge power wire routed separately from signal cables to prevent interference. Use a fuse holder within 18 inches of the battery; a 100A ANL fuse suits most setups. Ground the amplifier to the same chassis point as the head unit to avoid ground loops.
Test each function before final installation:
- Verify all speakers produce sound at equal volume levels.
- Check antenna motor operation (solid blue wire delivers 12V for extended mode).
- Ensure the parking brake wire (light green/black stripe) engages only when the brake is released–some systems mute audio otherwise.
For diagnostic purposes, note these default resistance values:
- Factory speaker impedance: 2 ohms
- Bose amplifier output impedance: 1.5 ohms
- Illumination circuit resistance at full brightness: 50 ohms
If readings deviate by more than 10%, inspect for damaged wiring or corroded pins in the 20-pin connector near the climate control module.
Matching the Right Plug-In Assembly for Your Vehicle’s Audio System
Locate the C2 harness behind the factory stereo–it’s the 16-pin gray connector marked A2 on the back of the stock head unit. Pinout readings for this connector follow this exact layout:
| Pin Number | Function | Wire Color | Voltage |
|---|---|---|---|
| 1 | Ground | Black | 0 V |
| 2 | Battery Constant (+12 V) | Yellow | 12 V |
| 4 | Illumination | Pink | Pulse |
| 6 | Front Right (+) | Gray/Black | 2 V RMS |
| 8 | Memory Keep Alive | Red | 12 V |
| 10 | Front Left (+) | Tan/Black | 2 V RMS |
| 12 | Rear Right (+) | Light Blue/Black | 2 V RMS |
| 14 | Rear Left (+) | White/Black | 2 V RMS |
| 16 | Ant Control | Blue/White | 12 V (Trigger) |
Verify each wire with a multimeter before attaching any aftermarket interface; measurements should match the table values within ±0.2 V. The blue/white lead requires a 5-second delay relay for proper antenna deployment–factory units handle this internally, so bypass kits often miss this step.
For models equipped with BOSE, an additional 24-pin white connector (C1) appears near the main harness. Its pins 1-4 supply 8-ohm amplified feeds, distinct from the standard high-level outputs in base trims. Attempting to splice directly into these wires without a line-level converter risks clipping the amplifier signal.
Use Metra 70-1761 for base trims or Axxess ASWC-1 with the AX-ADBOSE harness for vehicles carrying premium sound. Both kits include adapters pre-wired to handle illumination dimming signals–often overlooked in generic harnesses, leading to erratic display behavior.
Check for anti-theft lockouts before disconnecting power; the factory module triggers if the memory lead (red) drops below 9 V. Attach a 9 V battery to the red and black wires during installation to prevent code resets.
Aftermarket interfaces frequently mislabel the gray/black and tan/black speaker wires. Double-check phase with a tone generator set to 1 kHz–front right and left outputs should peak at identical polarity when probing C2 pins 6 and 10.
Step-by-Step Audio System Connector Breakdown for OEM Upgrades
Locate the 18-pin harness plug behind the dashboard trim–the primary interface for all vehicle-to-device connections. The upper row (pins 1–9) handles speaker outputs, while the lower row (pins 10–18) manages power, ground, and accessory signals. Prioritize verifying continuity with a multimeter before attaching new components to prevent short circuits or signal degradation.
Pin 1 (light blue/black stripe) delivers front-left positive speaker voltage–route this directly to the corresponding amplifier input without splicing. Pair it with Pin 2 (gray/black stripe) for the front-left negative return. Maintain polarity consistency; reversing these wires weakens audio clarity by canceling phase signals, especially in mid-range frequencies.
The rear speaker cluster uses Pins 5 and 6 (solid green and green/black stripe) for right-side outputs. Pins 3 and 4 (white and white/black stripe) mirror the layout for the left side. Avoid twisting these leads together; even minor resistance changes distort bass response. For aftermarket amplifiers, strip only 3–4mm of insulation to minimize exposed copper interference.
Permanent +12V power enters via Pin 10 (solid yellow)–this wire remains live regardless of ignition status and requires a 15A fuse within 15cm of the connection point. Pin 16 (red) supplies accessory power, activating only when the key is in the “on” position. Use crimp connectors rated for 20A to prevent voltage drop during peak load (e.g., subwoofer bursts).
Ground Pin 11 (black) demands direct chassis attachment–sand paint around the mounting point for a noise-free return path. For 2003–2007 model variants, Pin 12 (orange) carries illumination control; adjust dash light brightness settings before finalizing connections to avoid flickering during night driving. Test this with a 1KΩ resistor if the new head unit lacks dimmer compatibility.
Pin 17 (brown) delivers the vehicle speed signal for automated volume adjustments. If the replacement unit lacks this input, use a signal isolator to prevent feedback loops that trigger random volume spikes. For manual setups, bypass this wire entirely rather than leaving it unterminated, as floating inputs attract electromagnetic interference from the alternator.
Finalize the installation by wrapping exposed joints with adhesive-lined heat shrink tubing–standard electrical tape frays under dashboard heat cycles. Confirm all connections with an ohmmeter: 1MΩ between any signal wire and ground when powered off. Reconnect the negative battery terminal only after verifying these values to avoid resetting onboard computer modules.
Resolving Connection Problems in Your Premium Audio Setup
Check the fuse for the audio interface if sound cuts out abruptly. A blown 15-amp fuse in slot 18 of the interior fuse box often causes silence across all channels. Replace it with an identical rating, never higher.
Inspect the antenna lead for corrosion where it attaches to the rear of the head unit. Remove the mounting bolts, pull the unit forward, and detach the coaxial connector. Clean the threads with electrical contact cleaner and reattach firmly to restore FM reception strength.
Verify ground connections on the chassis near the driver-side kick panel if bass frequencies distort or fade intermittently. The main ground wire, typically black with a 10mm ring terminal, should be secured to bare metal, free of paint or rust. Tighten to 12 Nm torque.
Test the speaker outputs with a multimeter set to ohms if one channel produces no sound. Disconnect the harness behind the dashboard and probe the corresponding wires–front left/right pairs read approximately 4 ohms, rears around 2 ohms. A zero reading indicates a broken voice coil or disconnected wire.
Examine the dimmer circuit if display brightness flickers or fails. The orange with white stripe wire carries variable voltage from the lighting control module; trace it back along the harness for nicks or shorts. Damaged insulation often coincides with dashboard illumination issues.
Reset the system’s ECU if all settings revert after power loss. Disconnect the battery’s negative terminal for 10 minutes while the key is in the OFF position. Reconnect and wait 30 seconds before turning the ignition to ACC to force a reboot of stored memory.
Replace the internal amplifier’s relay if sound drops during engine cranking. Located under the passenger seat, the relay clicks when activated–listen for continuity. A faulty relay interrupts power during voltage dips, causing momentary audio failure.