Infiniti G25 G35 G37 Factory Radio Wiring Diagram & Harness Guide
Introduction
The Infiniti G-series (G25, G35, G37) offers exceptional performance and luxury, but upgrading the factory infotainment screen to a modern Android unit or Apple CarPlay display can be surprisingly complex. A common point of confusion for owners and installers is why the exact same model year car can feature completely different factory radio hardware.
Why does the exact same Infiniti model have different head units?
Nissan/Infiniti utilized multiple audio suppliers (such as Clarion, Bosch, and Panasonic) and revised the underlying electronics architecture across different trim levels and mid-cycle refreshes. The variation comes down to four primary technical factors:
- Factory Navigation vs. Non-Nav Trim: Models equipped with factory GPS feature a high-level digital communication protocol (GVIF/A-LINK), independent sub-modules, and distinct rear plug topologies compared to standard monochrome/non-nav units.
- Bose® Sound System Integration: Vehicles equipped with premium Bose audio route signals through external digital amplifiers via specialized balanced differential signals or fiber optic/CAN-bus triggers, requiring dedicated plug-and-play harness routing.
- Model Year & Hardware Lifecycle Refreshes: Mid-generation updates (e.g., transition from G35 to G37, or 2007–2009 vs. 2010+ updates) altered the climate control data bus, backup camera video inputs, and pinout arrangements.
- Regional Market Specifications: USDM, GCC, Japanese (JDM Skyline), and European specs differ in satellite radio integration (SiriusXM), AUX/USB interfaces, and antenna power feeds.
Factory Radio Type 1
Compatible with Wire Harness Set #1
Factory Radio Type 2
Compatible with Wire Harness Set #2
Factory Radio Type 3
Compatible with Wire Harness Set #3
Factory Radio Type 4
Compatible with Wire Harness Set #3
Note: Factory Radio Type 3 and Type 4 share the exact same main connector topology and both use Roadnavier Wire Harness Set #3.
Wire Harness Set #1 Explained
Wire Harness Set #1 is designed for non-navigation base models. Below is the detailed breakout for Connectors A, B, C, and D:
- Connector A (Main Power & Speaker Harness): Plugs directly into the vehicle's primary radio harness to power the head unit (+12V Constant, Switched ACC, Ground) and route front/rear audio channels directly to the speakers.
- Connector B (CAN-Bus Data Protocol Plug): Connects to the CAN decoder box to retain factory steering wheel controls (SWC), key ignition triggers, and night illumination dimming signals.
- Connector C (Climate Control Passthrough Plug): Interfaces directly with the white AC control module to retain factory air conditioning button response and screen status display.
- Connector D (Backup Camera Adapter Plugs - Dual Options Included): Provides the retention interface for the factory rear view camera. Note: Certain trim levels use different screen display connector pin counts (e.g., varying pin densities between color and monochrome dash setups). Wire Harness Set #1 includes TWO separate spare Connector D camera adapters—simply test and plug in the matching adapter that physically fits your OEM screen harness.
Wire Harness Set #2 Explained
Wire Harness Set #2 is configured for mid-trim configurations. Below is the functional breakout for Connectors A, B, C, and D:
- Connector A (Main Power & Low-Level Line Output): Supplies system power and routes balanced low-level audio output directly to the factory Bose/OEM amplifier without causing audio distortion or clipping.
- Connector B (CAN-Bus System Interface): Decodes vehicle data lines to maintain full steering wheel button commands, reverse signal triggers, and speed-sensing volume adjustments.
- Connector C (HVAC / AC Console Integration Plug): Plugs into the central AC Gateway module to pass HVAC control commands between the mechanical panel and the display screen.
- Connector D (Factory Camera Adapter - Multi-Pin Options Included): Reclaims the factory reverse camera signal and steps down the 12V reverse feed to the OEM 6V camera power spec. Because OEM screens came in multiple pin configurations across mid-cycle updates, this harness package supplies TWO alternate Connector D plugs. Select and connect the one that matches your vehicle's original screen harness pin count.
Wire Harness Set #3 Explained
Wire Harness Set #3 is engineered for high-spec factory navigation setups (Type 3 and Type 4). Breakout details for Connectors A, B, C, and D:
- Connector A (Navigation Main Power & Bose Amp Remote): Integrates main power feeds while incorporating an active AMP-CON line to trigger external Bose amplification modules seamlessly.
- Connector B (High-Speed CAN & Multimedia Bus Plug): Feeds vehicle telemetry and steering wheel button signals into the CAN box while maintaining factory clock and cluster sync settings.
- Connector C (Dual-Zone Climate Control Gateway Plug): Links the dual-zone auto climate module, retaining real-time temperature status popups and fan speed control on the new display screen.
- Connector D (Reverse Camera & 360° AVM Adapter - Dual Variant Plugs): Handles video signal routing for the backup camera or Around View Monitor. Since high-spec navigation screen units came with varying pin count setups depending on production year, TWO interchangeable Connector D plugs are included in the kit. Use the matching adapter plug that aligns with your vehicle's factory screen harness connector.
Frequently Asked Questions
Do I need to remove the factory radio?
Yes, access to the rear of the OEM CD changer/head unit chassis is required to unplug the main power, audio, and climate control connectors. However, in most Infiniti G25/G35/G37 aftermarket screen upgrades, the physical factory tuner/CD box is retained behind the dashboard panel to keep the vehicle's factory CAN-bus network intact.
How do I identify my OEM head unit?
Check three main features: 1) Presence of a physical "NAV" or "MAP" button on your center console dial, 2) The "Bose" logo on your door speaker grilles, and 3) The physical connector layout on the rear of your factory screen display. Match your dashboard layout with the Type 1–4 photos provided in this guide above.
Will my Bose amplifier still work?
Yes. All Roadnavier wire harness sets designed for Bose-equipped Infiniti models include the AMP remote control trigger wire and differential audio signal output pins, ensuring your factory Bose amplifier and subwoofer remain fully functional with enhanced audio processing.
Why do I need to reinstall the AC box?
In the Infiniti G-series architecture, the white air conditioning control module (located behind the lower dash panel) serves as a vital gateway node on the vehicle's body CAN-bus network. If this module is disconnected or left unplugged, the vehicle's climate control system will cease to function, and the gauge cluster may report CAN communication error codes.