Check the front luggage compartment panel first, as most electrical faults are traced there. Open the cover near the battery and match the numbered slots with the vehicle’s circuit list to locate the failed link quickly. Use a puller tool and verify amperage markings before installing a replacement to avoid damage to wiring.
The roadster uses multiple protection panels, including a secondary relay section behind the cabin trim. Common problem points include lighting circuits, power windows, and central locking, where worn components or moisture can lead to repeated failures. Inspect contacts for corrosion and ensure each connector sits firmly in place.
Each slot is assigned a specific current rating, typically ranging from 5A to 40A. Installing a higher-rated link can lead to overheating, while a lower rating may cause frequent interruptions. Keep a printed layout in the vehicle to identify circuits without delay and reduce troubleshooting time during roadside checks.
Front trunk fuse box layout with numbered slots and functions
Open the front luggage compartment and locate the main electrical panel near the battery, then use the numbered grid to match each slot with its assigned circuit. Start inspection from lower-numbered positions, as they often control primary systems like headlights, horn, and dashboard power feeds.
The layout follows a structured sequence, where each position corresponds to a specific component. Pay attention to labeling on the inner cover, which lists circuits and current ratings. Typical assignments include:
- Slots 1–5: exterior lighting and signal indicators
- Slots 6–10: interior electronics and instrument cluster
- Slots 11–15: power windows and central locking
- Slots 16–20: HVAC system and auxiliary equipment
Check alignment and seating of each element, as loose placement can interrupt power flow without visible damage.
Use a multimeter to confirm continuity when visual inspection is inconclusive. Remove each link carefully with plastic pliers and compare amperage values stamped on top. Do not swap positions between slots, since each circuit is calibrated for a specific load and wiring thickness.
Rear relay and fuse panel locations with circuit descriptions
Access the rear electrical panel by removing the carpeted cover behind the seats, then locate the relay carrier mounted near the engine bulkhead. Check this area when systems like fuel delivery, ignition, or cooling fans stop working, as many control modules are grouped here.
The rear section contains switching units and protective links responsible for high-load circuits. Typical assignments include fuel pump control, engine management, rear lighting, and heating elements. Each relay is marked with a code that corresponds to a specific function, making identification faster during diagnostics.
| Position | Component | Function |
|---|---|---|
| R1 | Fuel pump relay | Supplies power to fuel delivery system |
| R2 | Cooling fan relay | Controls radiator fan operation |
| R3 | Ignition relay | Manages engine start and ignition circuits |
| R4 | Heated rear window relay | Activates defroster grid |
Inspect connectors for heat marks or loose pins, as rear-mounted components are exposed to higher temperatures. Swap relays with identical part numbers only for testing, and return them to original positions after verification.
Use wiring charts to trace circuits from the rear panel to the affected component. If a system fails intermittently, test voltage at the relay terminals under load, not just at rest, to detect weak connections or internal contact wear.
Fuse ratings chart and steps to identify and replace a blown fuse
Match the amperage value printed on the plastic housing with the circuit requirement before removal, then inspect the metal strip inside for a visible break. Standard ratings include 5A, 7.5A, 10A, 15A, 20A, 25A, and 30A, each color-coded for quick recognition. Using a higher value risks overheating wires, while a lower one may fail under normal load.
Pull the damaged element with insulated pliers, confirm failure using a multimeter set to continuity mode, and install a replacement with identical rating and size. Clean the contacts if oxidation is present, then test the circuit under load to ensure stable operation and no repeat failure.