Start by locating the primary harness behind the dashboard’s lower panel–this bundle carries power, ground, and speaker feeds. Pinouts differ by trim, so verify colors using the factory service manual: LT Blue/Orange (constant 12V), Yellow/Black (switched 12V), and Brown/Tan (illumination). Mismatched connections risk amplifier overload or display malfunctions.
For aftermarket upgrades, splice the CAN bus wires–typically Orange/Green and White/Blue–to retain steering wheel controls and backup camera integration. Ignore these, and you’ll lose vehicle settings sync. Use a 18-22 AWG crimp connector or solder joints with heat shrink tubing; twist-and-tape methods degrade within months.
Speaker outputs follow a standard topology: front left (+) Gray/Black, front right (-) White/Brown, rear (+) Violet/White. Polarity errors cause phase cancellation, muffling output by up to 70%. Test with a 9V battery–positive lead should push the speaker cone outward.
Ground the unit to a bare metal chassis stud near the factory location; resistance above 0.5 ohms creates alternator whine. If static persists, inject a noise filter (10A fuse inline) between the power wire and battery. Avoid daisy-chaining to other components–shared grounds introduce interference.
For OEM navigation retention, retain the Pink/Light Blue antenna cable; cutting it forces GPS re-calibration. If replacing the head unit, ensure compatibility with the vehicle’s Uconnect module–third-party firmware often bricks advanced features like traffic updates.
Connecting Your Infotainment System in the 2019 Compass-Style SUV
Begin by locating the factory harness behind the center console, typically bundled with a 12-pin connector. Pinouts follow an atypical layout–unlike older models, the accessory power lead (switched 12V) sits at position C3-4, not C1-2. Verify this with a multimeter before splicing.
The amplifier integration presents the most common pitfall. OEM units route audio through a separate 8-pin harness (T-harness) that connects to the vehicle’s sound processor. Bypassing this without proper adapters will result in no sound from rear speakers, even if front channels appear functional. Use a PAC Audio RP4-CH11 for seamless compatibility.
| Connector | Pin Number | Function | Wire Color (Standard) |
|---|---|---|---|
| C1 | 1 | Ground | Black |
| C1 | 2 | Constant 12V | Yellow |
| C2 | 3 | Ignition (Switched 12V) | Red/White |
| C3 | 4 | Illumination | Gray |
| C4 | 5-6 | CAN Bus High/Low | Blue/White & Blue/Orange |
RGB illumination lines require precise voltage control–most aftermarket head units lack native support for this vehicle’s dimming protocol. Failure to account for this will cause either maximum brightness or complete dimming failure. Crutchfield’s Metra 70-1004 adapter includes a dedicated dimmer wire that resolves this issue without firmware modifications.
For steering wheel control retention, the CAN bus signals at pins C4-5 and C4-6 must remain uninterrupted. Splicing into these wires incorrectly will trigger error codes in the instrument cluster, often manifesting as false “Service Required” warnings. A iDatalink Maestro ADS-MRR bypass module is the only plug-and-play solution that maintains full functionality.
USB integration demands attention to power delivery. The OEM USB port delivers 1.5A–upgrading to a 3.0 port without an inline fuse will overload the circuit. A 10A fuse on the positive lead between the new port and pin C1-2 prevents shorts while meeting peak charging demands.
Final verification involves checking the MOST bus fiber-optic ring if equipped with premium audio. Disrupting this ring will disable satellite radio and voice commands. Use a specialized diagnostic tool like the Audi/VW VAG-COM to confirm signal continuity before closing the dash panels.
Finding the OEM Head Unit Harness Interface
Begin by removing the center dash panel around the audio system–this typically requires a plastic trim tool to pry clips without damage. The factory harness connector is positioned directly behind the climate control module, secured by a black plastic latch. Look for a 12-pin or 20-pin rectangular port, distinguishable by its color-coded wires (yellow for constant power, red for switched, black for ground). Avoid tugging wires; instead, press the release tab on the connector’s side to detach it cleanly.
Key Connection Points
Yellow wires carry 12V constant voltage–critical for memory functions. The red lead delivers power only when the ignition is active, while the orange/white stripe handles illumination dimming. Speaker outputs follow a standardized two-wire system: solid and striped variants per channel (front/rear, left/right). Cross-reference these with an aftermarket adapter guide to prevent mismatches, as incorrect pairing can fry amplifiers or trigger error codes in the vehicle’s computer module.
If the connector isn’t immediately visible, trace the bundled cables downward–manufacturers often bundle them with HVAC ducts or behind glove box reinforcements. Some models integrate the harness into a larger multi-pin block; split the housing with precision cutters if necessary, but ensure all connections are labeled before disassembly. Documenting each wire’s function with masking tape prevents headaches during reinstallation.
Decoding Wire Colors and Their Specific Roles
Locate the solid yellow cable–this carries constant 12V power, critical for preserving preset stations and system memory. Verify its connection to the main battery feed; any break here will reset settings after ignition cycles.
Purple with a white stripe typically handles the antenna trigger, activating external amplifiers when the audio source is powered on. Test this line with a multimeter set to 12V DC; expect no signal when the unit is off. If voltage persists, inspect the head unit’s amplifier relay.
The light blue with white tracer wire often interfaces with steering wheel controls. Trace it back to the column-mounted switch module; incorrect routing here disables volume or track skip functions. Use a scan tool compatible with UDS protocols to confirm signal integrity before soldering repairs.
Black wires without stripes serve as chassis grounds. Attach them to bare metal surfaces free of paint, corrosion, or sealant. Poor grounding causes buzzing, distorted playback, or intermittent shutdowns–sand the contact point down to shiny metal before securing.
Orange wires regulate illumination–linking to dash lighting circuits. Dimmer malfunctions often stem from reversed polarity on this line. Swap suspected connectors with a known-good fuse box harness to isolate faults.
Red with a white stripe delivers ignition-switched power. If the system fails to power on with the key, probe this wire at the factory harness junction. Voltage should match battery levels when the ignition is on; zero volts indicates a blown fuse or faulty ignition switch.
Gray wires carry speaker-level signals to front right tweeters. Clip leads here while playing a test tone–static or absent sound suggests a severed connection or failed amplifier stage. Replace crimped connectors with soldered joints for longevity.
Step-by-Step Guide to Removing the Dashboard Trim for Access
Begin by disconnecting the negative terminal of the vehicle’s battery to prevent electrical shorts or accidental airbag deployment. Wait at least 10 minutes before proceeding to allow residual voltage in the system to dissipate.
Locate the hidden clips securing the upper dashboard trim–these are typically positioned along the edges near the windshield and around the instrument cluster. Use a trim removal tool or a flat-head screwdriver wrapped in electrical tape to avoid scratching the surface. Insert the tool into the seam between the trim and the dashboard, then gently pry upward while supporting the panel with your free hand to prevent cracking.
Removing Lower Dashboard Panels
Start with the driver-side knee bolster by removing the two 7mm bolts beneath the panel. Pull the panel outward to release the retaining clips, then disconnect any wiring harnesses for electronics like the hood release or dimmer switches. Set the panel aside.
Proceed to the center console trim by removing the gear shift cover–this usually snaps into place and requires careful leverage with a trim tool. Underneath, you’ll find additional 8mm or 10mm bolts securing the climate control housing. Remove these, then slide the housing forward to access the screws behind it.
- Always label screws and bolts by their location (e.g., “upper left dash”) to simplify reassembly.
- Keep track of small components like washers or spacers–they often have specific positions.
- If resistance is felt while pulling a panel, stop and check for hidden fasteners or clips.
Final Steps Before Full Dashboard Removal
With the lower panels removed, focus on the steering column shroud–it’s secured by Torx T20 screws. Remove these, then lower the shroud to expose the wiring harnesses. Disconnect any plugs attached to the back of the cluster or multifunction switch before proceeding further.
For the final dashboard separation, remove the remaining screws along the top edge near the windshield (typically four Phillips-head screws) and any bolts behind the glove compartment. The dashboard should now lift away from the frame–support it carefully to avoid straining wiring or airbag connections. If resistance persists, recheck for overlooked fasteners or wiring harnesses still attached to the back of the unit.