Locate the main electrical panel under the driver’s side dashboard to access critical circuits for lighting, infotainment, and climate control. Remove the lower panel cover by unscrewing the three retaining screws and carefully pulling it outward to reveal the module.
For the engine compartment, identify the power center near the battery on the driver’s side. This housing contains relays and main links controlling starter, alternator, and cooling systems. Lift the cover by pressing the side tabs to avoid damaging clips.
Label each connection before removing relays to prevent misplacement. Use a test light or multimeter to check continuity and confirm which circuits correspond to each connector, particularly for high-load accessories like HVAC and window motors.
Relays in the cabin module are organized by function: headlamps, auxiliary outlets, and dashboard electronics occupy the upper rows, while door locks and wiper circuits are in the lower rows. This structure allows targeted troubleshooting without disrupting unrelated systems.
Always check amperage ratings on each link and replace with identical values to avoid overloading wiring harnesses. A blown link for the fuel pump or ABS will immediately affect drivability, so inspect visually for melted contacts or corrosion.
When reinstalling panels, ensure connectors are fully seated and clips snap into place. Loose connections can create intermittent faults that mimic sensor or control module failures.
Keep a printed reference sheet or a high-resolution photo of the panel layout for future maintenance. This reduces time spent tracing circuits and minimizes errors during relay swaps or link replacements.
Electrical Panel Reference and Relay Guide for 2020 Metris
Access the main cabin power module beneath the driver’s side dashboard by removing the lower trim panel. This exposes the relays controlling interior lighting, auxiliary power outlets, and climate control circuits.
Engine compartment power center is located next to the battery on the driver’s side. This module houses high-current links and relays for starter, alternator, radiator fan, and ABS systems. Press side tabs to lift the cover safely.
Identify relays by function and row position using the printed panel layout inside the cover. Upper rows typically handle lighting and infotainment circuits, while lower rows manage door locks, wiper motors, and auxiliary systems.
Check each link rating before replacement. Use a test light or multimeter to confirm continuity. Overrated links can stress wiring harnesses, while underrated replacements may trip repeatedly under normal load.
Remove and test relays individually by swapping with identical units controlling non-critical circuits. Observe system response to determine if the relay is malfunctioning without affecting critical components like fuel or ABS.
Document all connections before disconnecting. Label each plug and terminal to prevent cross-wiring. Incorrect reconnections can trigger multiple warning lights and unnecessary diagnostics.
Perform visual inspection for corrosion and overheating at all contact points. Discoloration, melted plastic, or greenish deposits indicate areas that require cleaning or replacement before restoring power.
Reinstall the cover securely and test all circuits. Ensure relays click into place and that connectors are fully seated. Run through each system–lighting, climate, windows–to verify proper operation before completing service.
Locating Cabin Power Module and Relay Positions
Access the main cabin power module by removing the lower driver’s side trim panel. This exposes the panel containing relays for interior lighting, climate control, and accessory power circuits. Each relay slot is labeled with its corresponding system for quick identification.
Relays controlling windows, door locks, and seat functions are arranged in the lower section of the module. Pull each relay straight out using a small handle or pliers, and note its position before testing or replacement to avoid misalignment.
Check the panel’s printed layout inside the cover to confirm the exact position of each relay and link. Use a multimeter to verify continuity across contacts, ensuring that electrical paths are intact and functional before reassembly.