Access the main circuit module located under the dashboard on the driver side to quickly identify each slot and its respective connections. Ensure the ignition is off before handling any connectors to prevent shorts.
Label all wiring harnesses clearly when removing any covers or connectors. This step reduces errors during reinstallation and helps trace individual circuits such as headlights, ignition, and interior accessories.
Use the numbering sequence printed on the holder to locate slots corresponding to the main systems: engine control, HVAC, lighting, and audio circuits. Each slot carries a specific amperage rating that should match the equipment it protects.
Keep a reference chart close to track which circuits are active and which require replacement or inspection. This allows precise troubleshooting without dismantling unrelated components, saving both time and potential damage.
Circuit Layout and Electrical Reference for 1991 NSX Model
Access the main electrical module under the dashboard on the driver’s side to inspect individual slots. Disconnect the battery before handling any connectors to avoid shorts or blown links.
Organize all connectors with labels when removing the cover. This prevents confusion and allows clear identification of circuits controlling engine management, lighting, HVAC, and audio systems.
Follow the printed numbering on the module to locate circuits quickly. Use the sequence to verify amperage ratings for each line and ensure it matches the connected component.
- Slot 1-3: Ignition and starter systems
- Slot 4-6: Interior lighting and accessory outlets
- Slot 7-9: HVAC blower, climate control, and sensors
- Slot 10-12: Headlights, tail lights, and brake circuits
- Slot 13-15: Audio system and auxiliary modules
Check for visible signs of wear or corrosion in each slot. Clean terminals with a contact-safe solution and secure wires to maintain stable connections.
Maintain a reference sheet of active circuits. Mark any replaced or tested lines to track troubleshooting progress and prevent errors during reassembly.
For complex repairs, trace the wiring paths to the corresponding relays or control units. Verify continuity with a multimeter and replace any defective holders to ensure all systems function correctly.
Locating Each Circuit Holder and Its Connection Points
Start by opening the driver-side dashboard module and inspecting each holder individually. Label each wire before disconnection to maintain accurate reconnection later.
Identify high-current circuits first, including ignition, starter, and main lighting lines. These are usually located near the top row of the assembly and are clearly marked with numbered terminals.
Trace each holder’s output wire to its corresponding component. For example, the HVAC blower connector runs directly to the climate control module, while interior lamps link to the auxiliary wiring harness.
Use a continuity tester to verify connection points. Test each slot from the holder to the load side of the circuit to ensure there are no breaks or loose contacts that could cause intermittent failures.
Organize holders by function and position. Place relays and sensors in adjacent slots, keeping engine management lines separate from accessory and lighting circuits to simplify troubleshooting and future maintenance.
Document the final arrangement with a labeled sketch or photo. Mark any replaced or repaired holders to provide a quick reference for routine inspections and electrical system upgrades.