How-To: Install a Double DIN Android Auto Head Unit in a 1994-2003 Pontiac Grand Prix

[Robert]

If you're ready to modernize the radio setup in your 94-03 Grand Prix, ditch that old 1.5 DIN unit and upgrade to a double DIN touchscreen with Android Auto and Apple CarPlay — while keeping your steering wheel audio controls. Here's how to do it right.

Parts Checklist​

• Head Unit Options (All support Android Auto & CarPlay):
• • Pioneer DMH-W4660NEX (wireless AA/CarPlay, modular design)
• • Sony XAV-AX4000 (great UI, compact chassis)
• • Kenwood DMX7709S (customizable UI, reliable brand)
• Dash Kit:
• • Metra 95-2001 GM Double DIN Dash Kit (Trim to fit the Grand Prix dash)
• Wiring & Connectivity:
• • Metra 70-1858 GM wiring harness (already on hand)
• • Metra 40-GM10 antenna adapter (already on hand)
• Steering Wheel Control Interface (Pick one):
• • Axxess ASWC-1 — most flexible, auto-detects vehicle/radio
• • PAC SWI-RC — for resistor-based setups like this

Tools Needed​

• Panel popper tool
• Rotary tool (Dremel) for dash trimming
• Soldering iron or crimp tools
• Wire stripper & tape
• Multimeter (for verifying SWC wires)

Wiring Overview​

Factory SWC wire:
- Look for a Dark Blue wire, usually in pin A7 of the 24-pin GM connector.
- This is the resistor-based steering wheel control signal.

To connect the SWC module:
1. Connect the Dark Blue wire to your SWC interface input.
2. Connect power (switched 12V), ground, and radio-specific control wires per your module instructions.
3. Program the module — Axxess ASWC-1 usually auto-detects both the car and radio. If not, follow manual programming steps.

Install Process​

Remove factory radio & dash trim: Unclip the bezel and unscrew the OEM unit.

Trim the radio opening: The Grand Prix’s 1.5 DIN slot must be enlarged vertically. Trim the plastic dash structure and possibly the back support bar for depth.

Install dash kit & head unit: Mount your head unit using the included brackets. Use the Metra kit as a trim bezel — trim to fit cleanly around your double DIN screen.

Wire it up: Connect the wiring harness adapter to your head unit and splice in the SWC module. Don’t forget the antenna adapter and mic/camera cables if needed.

Test everything: Power on the radio, test steering wheel buttons, Bluetooth, audio, etc. Secure all wiring and reinstall trim panels.

Final Tips​

• If using a floating screen, make sure it clears your HVAC controls.
• Consider adding a backup cam or USB extension while you’re in there.
• Label your wiring connections — future you will thank you.

Want to Share Your Build?​

Post your pics and questions in the thread below. If you found a cleaner bezel solution or have a plug-and-play bracket mod, share it with the community!